diff --git a/composer.json b/composer.json
index 8d9c05b6..530a2abe 100644
--- a/composer.json
+++ b/composer.json
@@ -18,7 +18,7 @@
         "psr/log": "^1.0.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "3.7.*"
+        "phpunit/phpunit": "^4.8.35"
     },
     "autoload": {
         "psr-0": {
diff --git a/tests/PayPal/Test/Api/AddressTest.php b/tests/PayPal/Test/Api/AddressTest.php
index 4fc5e561..d65739a7 100644
--- a/tests/PayPal/Test/Api/AddressTest.php
+++ b/tests/PayPal/Test/Api/AddressTest.php
@@ -1,15 +1,15 @@
 <?php
-
 namespace PayPal\Test\Api;
 
 use PayPal\Api\Address;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class Address
  *
  * @package PayPal\Test\Api
  */
-class AddressTest extends \PHPUnit_Framework_TestCase
+class AddressTest extends TestCase
 {
     /**
      * Gets Json String of Object Address
@@ -29,7 +29,6 @@ public static function getObject()
         return new Address(self::getJson());
     }
 
-
     /**
      * Tests for Serialization and Deserialization Issues
      * @return Address
diff --git a/tests/PayPal/Test/Api/AgreementStateDescriptorTest.php b/tests/PayPal/Test/Api/AgreementStateDescriptorTest.php
index f6737e5a..4012c052 100644
--- a/tests/PayPal/Test/Api/AgreementStateDescriptorTest.php
+++ b/tests/PayPal/Test/Api/AgreementStateDescriptorTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\AgreementStateDescriptor;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class AgreementStateDescriptor
  *
  * @package PayPal\Test\Api
  */
-class AgreementStateDescriptorTest extends \PHPUnit_Framework_TestCase
+class AgreementStateDescriptorTest extends TestCase
 {
     /**
      * Gets Json String of Object AgreementStateDescriptor
diff --git a/tests/PayPal/Test/Api/AgreementTest.php b/tests/PayPal/Test/Api/AgreementTest.php
index 2da2e727..1f625256 100644
--- a/tests/PayPal/Test/Api/AgreementTest.php
+++ b/tests/PayPal/Test/Api/AgreementTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\Agreement;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class Agreement
  *
  * @package PayPal\Test\Api
  */
-class AgreementTest extends \PHPUnit_Framework_TestCase
+class AgreementTest extends TestCase
 {
     /**
      * Gets Json String of Object Agreement
diff --git a/tests/PayPal/Test/Api/AgreementTransactionTest.php b/tests/PayPal/Test/Api/AgreementTransactionTest.php
index 2cea2007..fb30c624 100644
--- a/tests/PayPal/Test/Api/AgreementTransactionTest.php
+++ b/tests/PayPal/Test/Api/AgreementTransactionTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\AgreementTransaction;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class AgreementTransaction
  *
  * @package PayPal\Test\Api
  */
-class AgreementTransactionTest extends \PHPUnit_Framework_TestCase
+class AgreementTransactionTest extends TestCase
 {
     /**
      * Gets Json String of Object AgreementTransaction
diff --git a/tests/PayPal/Test/Api/AgreementTransactionsTest.php b/tests/PayPal/Test/Api/AgreementTransactionsTest.php
index 7abf98b0..5d601d31 100644
--- a/tests/PayPal/Test/Api/AgreementTransactionsTest.php
+++ b/tests/PayPal/Test/Api/AgreementTransactionsTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\AgreementTransactions;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class AgreementTransactions
  *
  * @package PayPal\Test\Api
  */
-class AgreementTransactionsTest extends \PHPUnit_Framework_TestCase
+class AgreementTransactionsTest extends TestCase
 {
     /**
      * Gets Json String of Object AgreementTransactions
diff --git a/tests/PayPal/Test/Api/AlternatePaymentTest.php b/tests/PayPal/Test/Api/AlternatePaymentTest.php
index 73c218a5..826d7513 100644
--- a/tests/PayPal/Test/Api/AlternatePaymentTest.php
+++ b/tests/PayPal/Test/Api/AlternatePaymentTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\AlternatePayment;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class AlternatePayment
  *
  * @package PayPal\Test\Api
  */
-class AlternatePaymentTest extends \PHPUnit_Framework_TestCase
+class AlternatePaymentTest extends TestCase
 {
     /**
      * Gets Json String of Object AlternatePayment
diff --git a/tests/PayPal/Test/Api/AmountTest.php b/tests/PayPal/Test/Api/AmountTest.php
index b50b5499..edc44be2 100644
--- a/tests/PayPal/Test/Api/AmountTest.php
+++ b/tests/PayPal/Test/Api/AmountTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\Amount;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class Amount
  *
  * @package PayPal\Test\Api
  */
-class AmountTest extends \PHPUnit_Framework_TestCase
+class AmountTest extends TestCase
 {
     /**
      * Gets Json String of Object Amount
diff --git a/tests/PayPal/Test/Api/AuthorizationTest.php b/tests/PayPal/Test/Api/AuthorizationTest.php
index cac00f22..abd9d7df 100644
--- a/tests/PayPal/Test/Api/AuthorizationTest.php
+++ b/tests/PayPal/Test/Api/AuthorizationTest.php
@@ -4,13 +4,14 @@
 
 use PayPal\Api\Authorization;
 use PayPal\Transport\PPRestCall;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class Authorization
  *
  * @package PayPal\Test\Api
  */
-class AuthorizationTest extends \PHPUnit_Framework_TestCase
+class AuthorizationTest extends TestCase
 {
     /**
      * Gets Json String of Object Authorization
diff --git a/tests/PayPal/Test/Api/BankAccountTest.php b/tests/PayPal/Test/Api/BankAccountTest.php
index 22f0c906..6e60fe9e 100644
--- a/tests/PayPal/Test/Api/BankAccountTest.php
+++ b/tests/PayPal/Test/Api/BankAccountTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\BankAccount;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class BankAccount
  *
  * @package PayPal\Test\Api
  */
-class BankAccountTest extends \PHPUnit_Framework_TestCase
+class BankAccountTest extends TestCase
 {
     /**
      * Gets Json String of Object BankAccount
diff --git a/tests/PayPal/Test/Api/BankAccountsListTest.php b/tests/PayPal/Test/Api/BankAccountsListTest.php
index 1736e28d..ab4cb7bd 100644
--- a/tests/PayPal/Test/Api/BankAccountsListTest.php
+++ b/tests/PayPal/Test/Api/BankAccountsListTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\BankAccountsList;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class BankAccountsList
  *
  * @package PayPal\Test\Api
  */
-class BankAccountsListTest extends \PHPUnit_Framework_TestCase
+class BankAccountsListTest extends TestCase
 {
     /**
      * Gets Json String of Object BankAccountsList
diff --git a/tests/PayPal/Test/Api/BankTokenTest.php b/tests/PayPal/Test/Api/BankTokenTest.php
index 3b6e4f2c..cc02b8bf 100644
--- a/tests/PayPal/Test/Api/BankTokenTest.php
+++ b/tests/PayPal/Test/Api/BankTokenTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\BankToken;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class BankToken
  *
  * @package PayPal\Test\Api
  */
-class BankTokenTest extends \PHPUnit_Framework_TestCase
+class BankTokenTest extends TestCase
 {
     /**
      * Gets Json String of Object BankToken
diff --git a/tests/PayPal/Test/Api/BillingInfoTest.php b/tests/PayPal/Test/Api/BillingInfoTest.php
index b5b2188b..822f5342 100644
--- a/tests/PayPal/Test/Api/BillingInfoTest.php
+++ b/tests/PayPal/Test/Api/BillingInfoTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\BillingInfo;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class BillingInfo
  *
  * @package PayPal\Test\Api
  */
-class BillingInfoTest extends \PHPUnit_Framework_TestCase
+class BillingInfoTest extends TestCase
 {
     /**
      * Gets Json String of Object BillingInfo
diff --git a/tests/PayPal/Test/Api/BillingTest.php b/tests/PayPal/Test/Api/BillingTest.php
index 332c4889..81623c4f 100644
--- a/tests/PayPal/Test/Api/BillingTest.php
+++ b/tests/PayPal/Test/Api/BillingTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\Billing;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class Billing
  *
  * @package PayPal\Test\Api
  */
-class BillingTest extends \PHPUnit_Framework_TestCase
+class BillingTest extends TestCase
 {
     /**
      * Gets Json String of Object Billing
diff --git a/tests/PayPal/Test/Api/CancelNotificationTest.php b/tests/PayPal/Test/Api/CancelNotificationTest.php
index 685a450e..a53cb451 100644
--- a/tests/PayPal/Test/Api/CancelNotificationTest.php
+++ b/tests/PayPal/Test/Api/CancelNotificationTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\CancelNotification;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class CancelNotification
  *
  * @package PayPal\Test\Api
  */
-class CancelNotificationTest extends \PHPUnit_Framework_TestCase
+class CancelNotificationTest extends TestCase
 {
     /**
      * Gets Json String of Object CancelNotification
diff --git a/tests/PayPal/Test/Api/CaptureTest.php b/tests/PayPal/Test/Api/CaptureTest.php
index 0314c82e..213be3ab 100644
--- a/tests/PayPal/Test/Api/CaptureTest.php
+++ b/tests/PayPal/Test/Api/CaptureTest.php
@@ -4,13 +4,14 @@
 
 use PayPal\Api\Capture;
 use PayPal\Transport\PPRestCall;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class Capture
  *
  * @package PayPal\Test\Api
  */
-class CaptureTest extends \PHPUnit_Framework_TestCase
+class CaptureTest extends TestCase
 {
     /**
      * Gets Json String of Object Capture
diff --git a/tests/PayPal/Test/Api/CarrierAccountTest.php b/tests/PayPal/Test/Api/CarrierAccountTest.php
index 1efd2c68..81bff3a8 100644
--- a/tests/PayPal/Test/Api/CarrierAccountTest.php
+++ b/tests/PayPal/Test/Api/CarrierAccountTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\CarrierAccount;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class CarrierAccount
  *
  * @package PayPal\Test\Api
  */
-class CarrierAccountTest extends \PHPUnit_Framework_TestCase
+class CarrierAccountTest extends TestCase
 {
     /**
      * Gets Json String of Object CarrierAccount
diff --git a/tests/PayPal/Test/Api/CarrierAccountTokenTest.php b/tests/PayPal/Test/Api/CarrierAccountTokenTest.php
index c4986c3d..e6282c5f 100644
--- a/tests/PayPal/Test/Api/CarrierAccountTokenTest.php
+++ b/tests/PayPal/Test/Api/CarrierAccountTokenTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\CarrierAccountToken;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class CarrierAccountToken
  *
  * @package PayPal\Test\Api
  */
-class CarrierAccountTokenTest extends \PHPUnit_Framework_TestCase
+class CarrierAccountTokenTest extends TestCase
 {
     /**
      * Gets Json String of Object CarrierAccountToken
diff --git a/tests/PayPal/Test/Api/CartBaseTest.php b/tests/PayPal/Test/Api/CartBaseTest.php
index d76b78bb..94802aaa 100644
--- a/tests/PayPal/Test/Api/CartBaseTest.php
+++ b/tests/PayPal/Test/Api/CartBaseTest.php
@@ -4,13 +4,14 @@
 
 use PayPal\Common\PayPalModel;
 use PayPal\Api\CartBase;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class CartBase
  *
  * @package PayPal\Test\Api
  */
-class CartBaseTest extends \PHPUnit_Framework_TestCase
+class CartBaseTest extends TestCase
 {
     /**
      * Gets Json String of Object CartBase
diff --git a/tests/PayPal/Test/Api/ChargeModelTest.php b/tests/PayPal/Test/Api/ChargeModelTest.php
index d375008e..f0ccbd43 100644
--- a/tests/PayPal/Test/Api/ChargeModelTest.php
+++ b/tests/PayPal/Test/Api/ChargeModelTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\ChargeModel;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class ChargeModel
  *
  * @package PayPal\Test\Api
  */
-class ChargeModelTest extends \PHPUnit_Framework_TestCase
+class ChargeModelTest extends TestCase
 {
     /**
      * Gets Json String of Object ChargeModels
diff --git a/tests/PayPal/Test/Api/CostTest.php b/tests/PayPal/Test/Api/CostTest.php
index 970c6321..f90dc64f 100644
--- a/tests/PayPal/Test/Api/CostTest.php
+++ b/tests/PayPal/Test/Api/CostTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\Cost;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class Cost
  *
  * @package PayPal\Test\Api
  */
-class CostTest extends \PHPUnit_Framework_TestCase
+class CostTest extends TestCase
 {
     /**
      * Gets Json String of Object Cost
diff --git a/tests/PayPal/Test/Api/CountryCodeTest.php b/tests/PayPal/Test/Api/CountryCodeTest.php
index 6ddda751..7827c011 100644
--- a/tests/PayPal/Test/Api/CountryCodeTest.php
+++ b/tests/PayPal/Test/Api/CountryCodeTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\CountryCode;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class CountryCode
  *
  * @package PayPal\Test\Api
  */
-class CountryCodeTest extends \PHPUnit_Framework_TestCase
+class CountryCodeTest extends TestCase
 {
     /**
      * Gets Json String of Object CountryCode
diff --git a/tests/PayPal/Test/Api/CreateProfileResponseTest.php b/tests/PayPal/Test/Api/CreateProfileResponseTest.php
index 88138cd2..f54b10a0 100644
--- a/tests/PayPal/Test/Api/CreateProfileResponseTest.php
+++ b/tests/PayPal/Test/Api/CreateProfileResponseTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\CreateProfileResponse;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class CreateProfileResponse
  *
  * @package PayPal\Test\Api
  */
-class CreateProfileResponseTest extends \PHPUnit_Framework_TestCase
+class CreateProfileResponseTest extends TestCase
 {
     /**
      * Gets Json String of Object CreateProfileResponse
diff --git a/tests/PayPal/Test/Api/CreditCardHistoryTest.php b/tests/PayPal/Test/Api/CreditCardHistoryTest.php
index 9308bb2a..4edcfd36 100644
--- a/tests/PayPal/Test/Api/CreditCardHistoryTest.php
+++ b/tests/PayPal/Test/Api/CreditCardHistoryTest.php
@@ -3,8 +3,9 @@
 
 use PayPal\Api\CreditCard;
 use PayPal\Api\CreditCardHistory;
+use PHPUnit\Framework\TestCase;
 
-class CreditCardHistoryTest extends \PHPUnit_Framework_TestCase
+class CreditCardHistoryTest extends TestCase
 {
 
     private $cards;
diff --git a/tests/PayPal/Test/Api/CreditCardListTest.php b/tests/PayPal/Test/Api/CreditCardListTest.php
index fb1f81d5..9029aaa5 100644
--- a/tests/PayPal/Test/Api/CreditCardListTest.php
+++ b/tests/PayPal/Test/Api/CreditCardListTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\CreditCardList;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class CreditCardList
  *
  * @package PayPal\Test\Api
  */
-class CreditCardListTest extends \PHPUnit_Framework_TestCase
+class CreditCardListTest extends TestCase
 {
     /**
      * Gets Json String of Object CreditCardList
diff --git a/tests/PayPal/Test/Api/CreditCardTest.php b/tests/PayPal/Test/Api/CreditCardTest.php
index 3088f5c7..af352bf7 100644
--- a/tests/PayPal/Test/Api/CreditCardTest.php
+++ b/tests/PayPal/Test/Api/CreditCardTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\CreditCard;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class CreditCard
  *
  * @package PayPal\Test\Api
  */
-class CreditCardTest extends \PHPUnit_Framework_TestCase
+class CreditCardTest extends TestCase
 {
     /**
      * Gets Json String of Object CreditCard
diff --git a/tests/PayPal/Test/Api/CreditCardTokenTest.php b/tests/PayPal/Test/Api/CreditCardTokenTest.php
index 2d6bab11..10da8baa 100644
--- a/tests/PayPal/Test/Api/CreditCardTokenTest.php
+++ b/tests/PayPal/Test/Api/CreditCardTokenTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\CreditCardToken;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class CreditCardToken
  *
  * @package PayPal\Test\Api
  */
-class CreditCardTokenTest extends \PHPUnit_Framework_TestCase
+class CreditCardTokenTest extends TestCase
 {
     /**
      * Gets Json String of Object CreditCardToken
diff --git a/tests/PayPal/Test/Api/CreditFinancingOfferedTest.php b/tests/PayPal/Test/Api/CreditFinancingOfferedTest.php
index c8d82082..04c4db0b 100644
--- a/tests/PayPal/Test/Api/CreditFinancingOfferedTest.php
+++ b/tests/PayPal/Test/Api/CreditFinancingOfferedTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\CreditFinancingOffered;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class CreditFinancingOffered
  *
  * @package PayPal\Test\Api
  */
-class CreditFinancingOfferedTest extends \PHPUnit_Framework_TestCase
+class CreditFinancingOfferedTest extends TestCase
 {
     /**
      * Gets Json String of Object CreditFinancingOffered
diff --git a/tests/PayPal/Test/Api/CreditTest.php b/tests/PayPal/Test/Api/CreditTest.php
index 51f91378..88abfb30 100644
--- a/tests/PayPal/Test/Api/CreditTest.php
+++ b/tests/PayPal/Test/Api/CreditTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\Credit;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class Credit
  *
  * @package PayPal\Test\Api
  */
-class CreditTest extends \PHPUnit_Framework_TestCase
+class CreditTest extends TestCase
 {
     /**
      * Gets Json String of Object Credit
diff --git a/tests/PayPal/Test/Api/CurrencyConversionTest.php b/tests/PayPal/Test/Api/CurrencyConversionTest.php
index 1b1c2133..544b0f0d 100644
--- a/tests/PayPal/Test/Api/CurrencyConversionTest.php
+++ b/tests/PayPal/Test/Api/CurrencyConversionTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\CurrencyConversion;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class CurrencyConversion
  *
  * @package PayPal\Test\Api
  */
-class CurrencyConversionTest extends \PHPUnit_Framework_TestCase
+class CurrencyConversionTest extends TestCase
 {
     /**
      * Gets Json String of Object CurrencyConversion
diff --git a/tests/PayPal/Test/Api/CurrencyTest.php b/tests/PayPal/Test/Api/CurrencyTest.php
index 38dfeea0..9558d551 100644
--- a/tests/PayPal/Test/Api/CurrencyTest.php
+++ b/tests/PayPal/Test/Api/CurrencyTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\Currency;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class Currency
  *
  * @package PayPal\Test\Api
  */
-class CurrencyTest extends \PHPUnit_Framework_TestCase
+class CurrencyTest extends TestCase
 {
     /**
      * Gets Json String of Object Currency
diff --git a/tests/PayPal/Test/Api/CustomAmountTest.php b/tests/PayPal/Test/Api/CustomAmountTest.php
index 7c02682c..cb003556 100644
--- a/tests/PayPal/Test/Api/CustomAmountTest.php
+++ b/tests/PayPal/Test/Api/CustomAmountTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\CustomAmount;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class CustomAmount
  *
  * @package PayPal\Test\Api
  */
-class CustomAmountTest extends \PHPUnit_Framework_TestCase
+class CustomAmountTest extends TestCase
 {
     /**
      * Gets Json String of Object CustomAmount
diff --git a/tests/PayPal/Test/Api/DetailedRefundTest.php b/tests/PayPal/Test/Api/DetailedRefundTest.php
index 73308d70..395e9157 100644
--- a/tests/PayPal/Test/Api/DetailedRefundTest.php
+++ b/tests/PayPal/Test/Api/DetailedRefundTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\DetailedRefund;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class DetailedRefund
  *
  * @package PayPal\Test\Api
  */
-class DetailedRefundTest extends \PHPUnit_Framework_TestCase
+class DetailedRefundTest extends TestCase
 {
     /**
      * Gets Json String of Object DetailedRefund
diff --git a/tests/PayPal/Test/Api/DetailsTest.php b/tests/PayPal/Test/Api/DetailsTest.php
index 78e03273..992494c9 100644
--- a/tests/PayPal/Test/Api/DetailsTest.php
+++ b/tests/PayPal/Test/Api/DetailsTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\Details;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class Details
  *
  * @package PayPal\Test\Api
  */
-class DetailsTest extends \PHPUnit_Framework_TestCase
+class DetailsTest extends TestCase
 {
     /**
      * Gets Json String of Object Details
diff --git a/tests/PayPal/Test/Api/ErrorDetailsTest.php b/tests/PayPal/Test/Api/ErrorDetailsTest.php
index 292c6fd2..7d3a4a67 100644
--- a/tests/PayPal/Test/Api/ErrorDetailsTest.php
+++ b/tests/PayPal/Test/Api/ErrorDetailsTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\ErrorDetails;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class ErrorDetails
  *
  * @package PayPal\Test\Api
  */
-class ErrorDetailsTest extends \PHPUnit_Framework_TestCase
+class ErrorDetailsTest extends TestCase
 {
     /**
      * Gets Json String of Object ErrorDetails
diff --git a/tests/PayPal/Test/Api/ErrorTest.php b/tests/PayPal/Test/Api/ErrorTest.php
index b104e8bd..a300b7e2 100644
--- a/tests/PayPal/Test/Api/ErrorTest.php
+++ b/tests/PayPal/Test/Api/ErrorTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\Error;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class Error
  *
  * @package PayPal\Test\Api
  */
-class ErrorTest extends \PHPUnit_Framework_TestCase
+class ErrorTest extends TestCase
 {
     /**
      * Gets Json String of Object Error
diff --git a/tests/PayPal/Test/Api/ExtendedBankAccountTest.php b/tests/PayPal/Test/Api/ExtendedBankAccountTest.php
index 98411af9..04ae2431 100644
--- a/tests/PayPal/Test/Api/ExtendedBankAccountTest.php
+++ b/tests/PayPal/Test/Api/ExtendedBankAccountTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\ExtendedBankAccount;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class ExtendedBankAccount
  *
  * @package PayPal\Test\Api
  */
-class ExtendedBankAccountTest extends \PHPUnit_Framework_TestCase
+class ExtendedBankAccountTest extends TestCase
 {
     /**
      * Gets Json String of Object ExtendedBankAccount
diff --git a/tests/PayPal/Test/Api/ExternalFundingTest.php b/tests/PayPal/Test/Api/ExternalFundingTest.php
index 2e85b44a..fb15ecb3 100644
--- a/tests/PayPal/Test/Api/ExternalFundingTest.php
+++ b/tests/PayPal/Test/Api/ExternalFundingTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\ExternalFunding;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class ExternalFunding
  *
  * @package PayPal\Test\Api
  */
-class ExternalFundingTest extends \PHPUnit_Framework_TestCase
+class ExternalFundingTest extends TestCase
 {
     /**
      * Gets Json String of Object ExternalFunding
diff --git a/tests/PayPal/Test/Api/FileAttachmentTest.php b/tests/PayPal/Test/Api/FileAttachmentTest.php
index 15bc029b..7c6e94ae 100644
--- a/tests/PayPal/Test/Api/FileAttachmentTest.php
+++ b/tests/PayPal/Test/Api/FileAttachmentTest.php
@@ -4,13 +4,14 @@
 
 use PayPal\Common\PayPalModel;
 use PayPal\Api\FileAttachment;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class FileAttachment
  *
  * @package PayPal\Test\Api
  */
-class FileAttachmentTest extends \PHPUnit_Framework_TestCase
+class FileAttachmentTest extends TestCase
 {
     /**
      * Gets Json String of Object FileAttachment
diff --git a/tests/PayPal/Test/Api/FlowConfigTest.php b/tests/PayPal/Test/Api/FlowConfigTest.php
index 07bbe623..aa6d935a 100644
--- a/tests/PayPal/Test/Api/FlowConfigTest.php
+++ b/tests/PayPal/Test/Api/FlowConfigTest.php
@@ -4,13 +4,14 @@
 
 use PayPal\Common\PayPalModel;
 use PayPal\Api\FlowConfig;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class FlowConfig
  *
  * @package PayPal\Test\Api
  */
-class FlowConfigTest extends \PHPUnit_Framework_TestCase
+class FlowConfigTest extends TestCase
 {
     /**
      * Gets Json String of Object FlowConfig
diff --git a/tests/PayPal/Test/Api/FmfDetailsTest.php b/tests/PayPal/Test/Api/FmfDetailsTest.php
index 9bfee967..74dafa32 100644
--- a/tests/PayPal/Test/Api/FmfDetailsTest.php
+++ b/tests/PayPal/Test/Api/FmfDetailsTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\FmfDetails;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class FmfDetails
  *
  * @package PayPal\Test\Api
  */
-class FmfDetailsTest extends \PHPUnit_Framework_TestCase
+class FmfDetailsTest extends TestCase
 {
     /**
      * Gets Json String of Object FmfDetails
diff --git a/tests/PayPal/Test/Api/FundingDetailTest.php b/tests/PayPal/Test/Api/FundingDetailTest.php
index 84226149..ef8c36a5 100644
--- a/tests/PayPal/Test/Api/FundingDetailTest.php
+++ b/tests/PayPal/Test/Api/FundingDetailTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\FundingDetail;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class FundingDetail
  *
  * @package PayPal\Test\Api
  */
-class FundingDetailTest extends \PHPUnit_Framework_TestCase
+class FundingDetailTest extends TestCase
 {
     /**
      * Gets Json String of Object FundingDetail
diff --git a/tests/PayPal/Test/Api/FundingInstrumentTest.php b/tests/PayPal/Test/Api/FundingInstrumentTest.php
index b09a282e..50f73692 100644
--- a/tests/PayPal/Test/Api/FundingInstrumentTest.php
+++ b/tests/PayPal/Test/Api/FundingInstrumentTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\FundingInstrument;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class FundingInstrument
  *
  * @package PayPal\Test\Api
  */
-class FundingInstrumentTest extends \PHPUnit_Framework_TestCase
+class FundingInstrumentTest extends TestCase
 {
     /**
      * Gets Json String of Object FundingInstrument
diff --git a/tests/PayPal/Test/Api/FundingOptionTest.php b/tests/PayPal/Test/Api/FundingOptionTest.php
index 556bbee3..6764adee 100644
--- a/tests/PayPal/Test/Api/FundingOptionTest.php
+++ b/tests/PayPal/Test/Api/FundingOptionTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\FundingOption;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class FundingOption
  *
  * @package PayPal\Test\Api
  */
-class FundingOptionTest extends \PHPUnit_Framework_TestCase
+class FundingOptionTest extends TestCase
 {
     /**
      * Gets Json String of Object FundingOption
diff --git a/tests/PayPal/Test/Api/FundingSourceTest.php b/tests/PayPal/Test/Api/FundingSourceTest.php
index 6954dfe7..5e84dab8 100644
--- a/tests/PayPal/Test/Api/FundingSourceTest.php
+++ b/tests/PayPal/Test/Api/FundingSourceTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\FundingSource;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class FundingSource
  *
  * @package PayPal\Test\Api
  */
-class FundingSourceTest extends \PHPUnit_Framework_TestCase
+class FundingSourceTest extends TestCase
 {
     /**
      * Gets Json String of Object FundingSource
diff --git a/tests/PayPal/Test/Api/HyperSchemaTest.php b/tests/PayPal/Test/Api/HyperSchemaTest.php
index 68d7e75f..76130d9c 100644
--- a/tests/PayPal/Test/Api/HyperSchemaTest.php
+++ b/tests/PayPal/Test/Api/HyperSchemaTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\HyperSchema;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class HyperSchema
  *
  * @package PayPal\Test\Api
  */
-class HyperSchemaTest extends \PHPUnit_Framework_TestCase
+class HyperSchemaTest extends TestCase
 {
     /**
      * Gets Json String of Object HyperSchema
diff --git a/tests/PayPal/Test/Api/ImageTest.php b/tests/PayPal/Test/Api/ImageTest.php
index 107540dd..ac524701 100644
--- a/tests/PayPal/Test/Api/ImageTest.php
+++ b/tests/PayPal/Test/Api/ImageTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\Image;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class Image
  *
  * @package PayPal\Test\Api
  */
-class ImageTest extends \PHPUnit_Framework_TestCase
+class ImageTest extends TestCase
 {
     /**
      * Gets Json String of Object Patch
diff --git a/tests/PayPal/Test/Api/IncentiveTest.php b/tests/PayPal/Test/Api/IncentiveTest.php
index 12cbd04f..f99b3b42 100644
--- a/tests/PayPal/Test/Api/IncentiveTest.php
+++ b/tests/PayPal/Test/Api/IncentiveTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\Incentive;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class Incentive
  *
  * @package PayPal\Test\Api
  */
-class IncentiveTest extends \PHPUnit_Framework_TestCase
+class IncentiveTest extends TestCase
 {
     /**
      * Gets Json String of Object Incentive
diff --git a/tests/PayPal/Test/Api/InputFieldsTest.php b/tests/PayPal/Test/Api/InputFieldsTest.php
index 8c6b99c3..4c5aac90 100644
--- a/tests/PayPal/Test/Api/InputFieldsTest.php
+++ b/tests/PayPal/Test/Api/InputFieldsTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\InputFields;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class InputFields
  *
  * @package PayPal\Test\Api
  */
-class InputFieldsTest extends \PHPUnit_Framework_TestCase
+class InputFieldsTest extends TestCase
 {
     /**
      * Gets Json String of Object InputFields
diff --git a/tests/PayPal/Test/Api/InstallmentInfoTest.php b/tests/PayPal/Test/Api/InstallmentInfoTest.php
index ed0f399f..cd3d6d88 100644
--- a/tests/PayPal/Test/Api/InstallmentInfoTest.php
+++ b/tests/PayPal/Test/Api/InstallmentInfoTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\InstallmentInfo;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class InstallmentInfo
  *
  * @package PayPal\Test\Api
  */
-class InstallmentInfoTest extends \PHPUnit_Framework_TestCase
+class InstallmentInfoTest extends TestCase
 {
     /**
      * Gets Json String of Object InstallmentInfo
diff --git a/tests/PayPal/Test/Api/InstallmentOptionTest.php b/tests/PayPal/Test/Api/InstallmentOptionTest.php
index 95963e73..652b0004 100644
--- a/tests/PayPal/Test/Api/InstallmentOptionTest.php
+++ b/tests/PayPal/Test/Api/InstallmentOptionTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\InstallmentOption;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class InstallmentOption
  *
  * @package PayPal\Test\Api
  */
-class InstallmentOptionTest extends \PHPUnit_Framework_TestCase
+class InstallmentOptionTest extends TestCase
 {
     /**
      * Gets Json String of Object InstallmentOption
diff --git a/tests/PayPal/Test/Api/InvoiceAddressTest.php b/tests/PayPal/Test/Api/InvoiceAddressTest.php
index e0f70505..e9813764 100644
--- a/tests/PayPal/Test/Api/InvoiceAddressTest.php
+++ b/tests/PayPal/Test/Api/InvoiceAddressTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\InvoiceAddress;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class InvoiceAddress
  *
  * @package PayPal\Test\Api
  */
-class InvoiceAddressTest extends \PHPUnit_Framework_TestCase
+class InvoiceAddressTest extends TestCase
 {
     /**
      * Gets Json String of Object Address
diff --git a/tests/PayPal/Test/Api/InvoiceItemTest.php b/tests/PayPal/Test/Api/InvoiceItemTest.php
index 0ff8a44f..5a4f3193 100644
--- a/tests/PayPal/Test/Api/InvoiceItemTest.php
+++ b/tests/PayPal/Test/Api/InvoiceItemTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\InvoiceItem;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class InvoiceItem
  *
  * @package PayPal\Test\Api
  */
-class InvoiceItemTest extends \PHPUnit_Framework_TestCase
+class InvoiceItemTest extends TestCase
 {
     /**
      * Gets Json String of Object InvoiceItem
diff --git a/tests/PayPal/Test/Api/InvoiceNumberTest.php b/tests/PayPal/Test/Api/InvoiceNumberTest.php
index 4c6c0281..48022f54 100644
--- a/tests/PayPal/Test/Api/InvoiceNumberTest.php
+++ b/tests/PayPal/Test/Api/InvoiceNumberTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\InvoiceNumber;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class Cost
  *
  * @package PayPal\Test\Api
  */
-class InvoiceNumberTest extends \PHPUnit_Framework_TestCase
+class InvoiceNumberTest extends TestCase
 {
     /**
      * Gets Json String of Object Cost
diff --git a/tests/PayPal/Test/Api/InvoiceSearchResponseTest.php b/tests/PayPal/Test/Api/InvoiceSearchResponseTest.php
index fbf6ee3d..f362c434 100644
--- a/tests/PayPal/Test/Api/InvoiceSearchResponseTest.php
+++ b/tests/PayPal/Test/Api/InvoiceSearchResponseTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\InvoiceSearchResponse;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class InvoiceSearchResponse
  *
  * @package PayPal\Test\Api
  */
-class InvoiceSearchResponseTest extends \PHPUnit_Framework_TestCase
+class InvoiceSearchResponseTest extends TestCase
 {
     /**
      * Gets Json String of Object InvoiceSearchResponse
diff --git a/tests/PayPal/Test/Api/InvoiceTest.php b/tests/PayPal/Test/Api/InvoiceTest.php
index 4b53a75a..f41c0b67 100644
--- a/tests/PayPal/Test/Api/InvoiceTest.php
+++ b/tests/PayPal/Test/Api/InvoiceTest.php
@@ -4,13 +4,14 @@
 
 use PayPal\Api\Invoice;
 use PayPal\Api\InvoiceNumber;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class Invoice
  *
  * @package PayPal\Test\Api
  */
-class InvoiceTest extends \PHPUnit_Framework_TestCase
+class InvoiceTest extends TestCase
 {
     /**
      * Gets Json String of Object Invoice
diff --git a/tests/PayPal/Test/Api/ItemListTest.php b/tests/PayPal/Test/Api/ItemListTest.php
index 498bfde0..e248c569 100644
--- a/tests/PayPal/Test/Api/ItemListTest.php
+++ b/tests/PayPal/Test/Api/ItemListTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\ItemList;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class ItemList
  *
  * @package PayPal\Test\Api
  */
-class ItemListTest extends \PHPUnit_Framework_TestCase
+class ItemListTest extends TestCase
 {
     /**
      * Gets Json String of Object ItemList
diff --git a/tests/PayPal/Test/Api/ItemTest.php b/tests/PayPal/Test/Api/ItemTest.php
index ded71668..4fae3983 100644
--- a/tests/PayPal/Test/Api/ItemTest.php
+++ b/tests/PayPal/Test/Api/ItemTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\Item;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class Item
  *
  * @package PayPal\Test\Api
  */
-class ItemTest extends \PHPUnit_Framework_TestCase
+class ItemTest extends TestCase
 {
     /**
      * Gets Json String of Object Item
diff --git a/tests/PayPal/Test/Api/LinksTest.php b/tests/PayPal/Test/Api/LinksTest.php
index 5168144a..a45aba39 100644
--- a/tests/PayPal/Test/Api/LinksTest.php
+++ b/tests/PayPal/Test/Api/LinksTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\Links;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class Links
  *
  * @package PayPal\Test\Api
  */
-class LinksTest extends \PHPUnit_Framework_TestCase
+class LinksTest extends TestCase
 {
     /**
      * Gets Json String of Object Links
diff --git a/tests/PayPal/Test/Api/MeasurementTest.php b/tests/PayPal/Test/Api/MeasurementTest.php
index 5a0bf1fd..84964cf6 100644
--- a/tests/PayPal/Test/Api/MeasurementTest.php
+++ b/tests/PayPal/Test/Api/MeasurementTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\Measurement;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class Measurement
  *
  * @package PayPal\Test\Api
  */
-class MeasurementTest extends \PHPUnit_Framework_TestCase
+class MeasurementTest extends TestCase
 {
     /**
      * Gets Json String of Object Measurement
diff --git a/tests/PayPal/Test/Api/MerchantInfoTest.php b/tests/PayPal/Test/Api/MerchantInfoTest.php
index 38466b4e..be59f7e4 100644
--- a/tests/PayPal/Test/Api/MerchantInfoTest.php
+++ b/tests/PayPal/Test/Api/MerchantInfoTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\MerchantInfo;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class MerchantInfo
  *
  * @package PayPal\Test\Api
  */
-class MerchantInfoTest extends \PHPUnit_Framework_TestCase
+class MerchantInfoTest extends TestCase
 {
     /**
      * Gets Json String of Object MerchantInfo
diff --git a/tests/PayPal/Test/Api/MerchantPreferencesTest.php b/tests/PayPal/Test/Api/MerchantPreferencesTest.php
index 3f78c9a0..0d4057c6 100644
--- a/tests/PayPal/Test/Api/MerchantPreferencesTest.php
+++ b/tests/PayPal/Test/Api/MerchantPreferencesTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\MerchantPreferences;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class MerchantPreferences
  *
  * @package PayPal\Test\Api
  */
-class MerchantPreferencesTest extends \PHPUnit_Framework_TestCase
+class MerchantPreferencesTest extends TestCase
 {
     /**
      * Gets Json String of Object MerchantPreferences
diff --git a/tests/PayPal/Test/Api/MetadataTest.php b/tests/PayPal/Test/Api/MetadataTest.php
index a62a8077..8cdc7900 100644
--- a/tests/PayPal/Test/Api/MetadataTest.php
+++ b/tests/PayPal/Test/Api/MetadataTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\Metadata;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class Metadata
  *
  * @package PayPal\Test\Api
  */
-class MetadataTest extends \PHPUnit_Framework_TestCase
+class MetadataTest extends TestCase
 {
     /**
      * Gets Json String of Object Metadata
diff --git a/tests/PayPal/Test/Api/NameValuePairTest.php b/tests/PayPal/Test/Api/NameValuePairTest.php
index a6100a25..3b452a28 100644
--- a/tests/PayPal/Test/Api/NameValuePairTest.php
+++ b/tests/PayPal/Test/Api/NameValuePairTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\NameValuePair;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class NameValuePair
  *
  * @package PayPal\Test\Api
  */
-class NameValuePairTest extends \PHPUnit_Framework_TestCase
+class NameValuePairTest extends TestCase
 {
     /**
      * Gets Json String of Object NameValuePair
diff --git a/tests/PayPal/Test/Api/NotificationTest.php b/tests/PayPal/Test/Api/NotificationTest.php
index 38af7542..ead25569 100644
--- a/tests/PayPal/Test/Api/NotificationTest.php
+++ b/tests/PayPal/Test/Api/NotificationTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\Notification;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class Notification
  *
  * @package PayPal\Test\Api
  */
-class NotificationTest extends \PHPUnit_Framework_TestCase
+class NotificationTest extends TestCase
 {
     /**
      * Gets Json String of Object Notification
diff --git a/tests/PayPal/Test/Api/OpenIdAddressTest.php b/tests/PayPal/Test/Api/OpenIdAddressTest.php
index 1079d340..de290430 100644
--- a/tests/PayPal/Test/Api/OpenIdAddressTest.php
+++ b/tests/PayPal/Test/Api/OpenIdAddressTest.php
@@ -2,12 +2,13 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\OpenIdAddress;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Test class for OpenIdAddress.
  *
  */
-class OpenIdAddressTest extends \PHPUnit_Framework_TestCase
+class OpenIdAddressTest extends TestCase
 {
 
     /** @var  OpenIdAddress */
@@ -28,14 +29,15 @@ protected function setUp()
      */
     protected function tearDown()
     {
+
     }
 
     public static function getTestData()
     {
         $addr = new OpenIdAddress();
         $addr->setCountry("US")->setLocality("San Jose")
-            ->setPostalCode("95112")->setRegion("CA")
-            ->setStreetAddress("1, North 1'st street");
+                ->setPostalCode("95112")->setRegion("CA")
+                ->setStreetAddress("1, North 1'st street");
         return $addr;
     }
 
@@ -49,4 +51,5 @@ public function testSerializationDeserialization()
 
         $this->assertEquals($this->addr, $addrCopy);
     }
+
 }
diff --git a/tests/PayPal/Test/Api/OpenIdErrorTest.php b/tests/PayPal/Test/Api/OpenIdErrorTest.php
index 1d938c36..07be8d2f 100644
--- a/tests/PayPal/Test/Api/OpenIdErrorTest.php
+++ b/tests/PayPal/Test/Api/OpenIdErrorTest.php
@@ -3,12 +3,13 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\OpenIdError;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Test class for OpenIdError.
  *
  */
-class OpenIdErrorTest extends \PHPUnit_Framework_TestCase
+class OpenIdErrorTest extends TestCase
 {
 
     /** @var  OpenIdError */
diff --git a/tests/PayPal/Test/Api/OpenIdSessionTest.php b/tests/PayPal/Test/Api/OpenIdSessionTest.php
index 0a5a98d7..5e9fc2e7 100644
--- a/tests/PayPal/Test/Api/OpenIdSessionTest.php
+++ b/tests/PayPal/Test/Api/OpenIdSessionTest.php
@@ -4,12 +4,13 @@
 
 use PayPal\Api\OpenIdSession;
 use PayPal\Rest\ApiContext;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Test class for OpenIdSession.
  *
  */
-class OpenIdSessionTest extends \PHPUnit_Framework_TestCase
+class OpenIdSessionTest extends TestCase
 {
 
     private $context;
diff --git a/tests/PayPal/Test/Api/OpenIdTokeninfoTest.php b/tests/PayPal/Test/Api/OpenIdTokeninfoTest.php
index 34cfa8c0..87f6b403 100644
--- a/tests/PayPal/Test/Api/OpenIdTokeninfoTest.php
+++ b/tests/PayPal/Test/Api/OpenIdTokeninfoTest.php
@@ -2,12 +2,13 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\OpenIdTokeninfo;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Test class for OpenIdTokeninfo.
  *
  */
-class OpenIdTokeninfoTest extends \PHPUnit_Framework_TestCase
+class OpenIdTokeninfoTest extends TestCase
 {
 
     /** @var  OpenIdTokeninfo */
diff --git a/tests/PayPal/Test/Api/OpenIdUserinfoTest.php b/tests/PayPal/Test/Api/OpenIdUserinfoTest.php
index 8c543b1d..34f0de0b 100644
--- a/tests/PayPal/Test/Api/OpenIdUserinfoTest.php
+++ b/tests/PayPal/Test/Api/OpenIdUserinfoTest.php
@@ -3,12 +3,13 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\OpenIdUserinfo;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Test class for OpenIdUserinfo.
  *
  */
-class OpenIdUserinfoTest extends \PHPUnit_Framework_TestCase
+class OpenIdUserinfoTest extends TestCase
 {
 
 
diff --git a/tests/PayPal/Test/Api/OrderTest.php b/tests/PayPal/Test/Api/OrderTest.php
index e917d809..d3b61a5e 100644
--- a/tests/PayPal/Test/Api/OrderTest.php
+++ b/tests/PayPal/Test/Api/OrderTest.php
@@ -4,13 +4,14 @@
 
 use PayPal\Api\Authorization;
 use PayPal\Api\Order;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class Order
  *
  * @package PayPal\Test\Api
  */
-class OrderTest extends \PHPUnit_Framework_TestCase
+class OrderTest extends TestCase
 {
     /**
      * Gets Json String of Object Order
diff --git a/tests/PayPal/Test/Api/OverrideChargeModelTest.php b/tests/PayPal/Test/Api/OverrideChargeModelTest.php
index 36337482..1161f2ff 100644
--- a/tests/PayPal/Test/Api/OverrideChargeModelTest.php
+++ b/tests/PayPal/Test/Api/OverrideChargeModelTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\OverrideChargeModel;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class OverrideChargeModel
  *
  * @package PayPal\Test\Api
  */
-class OverrideChargeModelTest extends \PHPUnit_Framework_TestCase
+class OverrideChargeModelTest extends TestCase
 {
     /**
      * Gets Json String of Object OverrideChargeModel
diff --git a/tests/PayPal/Test/Api/ParticipantTest.php b/tests/PayPal/Test/Api/ParticipantTest.php
index be8d5220..a1f2e792 100644
--- a/tests/PayPal/Test/Api/ParticipantTest.php
+++ b/tests/PayPal/Test/Api/ParticipantTest.php
@@ -4,13 +4,14 @@
 
 use PayPal\Common\PayPalModel;
 use PayPal\Api\Participant;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class Participant
  *
  * @package PayPal\Test\Api
  */
-class ParticipantTest extends \PHPUnit_Framework_TestCase
+class ParticipantTest extends TestCase
 {
     /**
      * Gets Json String of Object Participant
diff --git a/tests/PayPal/Test/Api/PatchRequestTest.php b/tests/PayPal/Test/Api/PatchRequestTest.php
index 133d9c47..dead21b5 100644
--- a/tests/PayPal/Test/Api/PatchRequestTest.php
+++ b/tests/PayPal/Test/Api/PatchRequestTest.php
@@ -4,13 +4,14 @@
 
 use PayPal\Common\PayPalModel;
 use PayPal\Api\PatchRequest;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class PatchRequest
  *
  * @package PayPal\Test\Api
  */
-class PatchRequestTest extends \PHPUnit_Framework_TestCase
+class PatchRequestTest extends TestCase
 {
     /**
      * Gets Json String of Object PatchRequest
diff --git a/tests/PayPal/Test/Api/PatchTest.php b/tests/PayPal/Test/Api/PatchTest.php
index 9b989c9d..a1ecabda 100644
--- a/tests/PayPal/Test/Api/PatchTest.php
+++ b/tests/PayPal/Test/Api/PatchTest.php
@@ -4,13 +4,14 @@
 
 use PayPal\Common\PayPalModel;
 use PayPal\Api\Patch;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class Patch
  *
  * @package PayPal\Test\Api
  */
-class PatchTest extends \PHPUnit_Framework_TestCase
+class PatchTest extends TestCase
 {
     /**
      * Gets Json String of Object Patch
diff --git a/tests/PayPal/Test/Api/PayeeTest.php b/tests/PayPal/Test/Api/PayeeTest.php
index cce2e740..41d6f872 100644
--- a/tests/PayPal/Test/Api/PayeeTest.php
+++ b/tests/PayPal/Test/Api/PayeeTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\Payee;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class Payee
  *
  * @package PayPal\Test\Api
  */
-class PayeeTest extends \PHPUnit_Framework_TestCase
+class PayeeTest extends TestCase
 {
     /**
      * Gets Json String of Object Payee
diff --git a/tests/PayPal/Test/Api/PayerInfoTest.php b/tests/PayPal/Test/Api/PayerInfoTest.php
index 18b9a818..7d56682a 100644
--- a/tests/PayPal/Test/Api/PayerInfoTest.php
+++ b/tests/PayPal/Test/Api/PayerInfoTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\PayerInfo;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class PayerInfo
  *
  * @package PayPal\Test\Api
  */
-class PayerInfoTest extends \PHPUnit_Framework_TestCase
+class PayerInfoTest extends TestCase
 {
     /**
      * Gets Json String of Object PayerInfo
diff --git a/tests/PayPal/Test/Api/PayerTest.php b/tests/PayPal/Test/Api/PayerTest.php
index 7e29d94c..a7051faa 100644
--- a/tests/PayPal/Test/Api/PayerTest.php
+++ b/tests/PayPal/Test/Api/PayerTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\Payer;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class Payer
  *
  * @package PayPal\Test\Api
  */
-class PayerTest extends \PHPUnit_Framework_TestCase
+class PayerTest extends TestCase
 {
     /**
      * Gets Json String of Object Payer
diff --git a/tests/PayPal/Test/Api/PaymentCardTest.php b/tests/PayPal/Test/Api/PaymentCardTest.php
index 86cce222..a4b617a4 100644
--- a/tests/PayPal/Test/Api/PaymentCardTest.php
+++ b/tests/PayPal/Test/Api/PaymentCardTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\PaymentCard;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class PaymentCard
  *
  * @package PayPal\Test\Api
  */
-class PaymentCardTest extends \PHPUnit_Framework_TestCase
+class PaymentCardTest extends TestCase
 {
     /**
      * Gets Json String of Object PaymentCard
diff --git a/tests/PayPal/Test/Api/PaymentCardTokenTest.php b/tests/PayPal/Test/Api/PaymentCardTokenTest.php
index be8b3eb7..a8c60741 100644
--- a/tests/PayPal/Test/Api/PaymentCardTokenTest.php
+++ b/tests/PayPal/Test/Api/PaymentCardTokenTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\PaymentCardToken;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class PaymentCardToken
  *
  * @package PayPal\Test\Api
  */
-class PaymentCardTokenTest extends \PHPUnit_Framework_TestCase
+class PaymentCardTokenTest extends TestCase
 {
     /**
      * Gets Json String of Object PaymentCardToken
diff --git a/tests/PayPal/Test/Api/PaymentDefinitionTest.php b/tests/PayPal/Test/Api/PaymentDefinitionTest.php
index 05fad641..bcfab58e 100644
--- a/tests/PayPal/Test/Api/PaymentDefinitionTest.php
+++ b/tests/PayPal/Test/Api/PaymentDefinitionTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\PaymentDefinition;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class PaymentDefinition
  *
  * @package PayPal\Test\Api
  */
-class PaymentDefinitionTest extends \PHPUnit_Framework_TestCase
+class PaymentDefinitionTest extends TestCase
 {
     /**
      * Gets Json String of Object PaymentDefinition
diff --git a/tests/PayPal/Test/Api/PaymentDetailTest.php b/tests/PayPal/Test/Api/PaymentDetailTest.php
index 09a79e42..87e64920 100644
--- a/tests/PayPal/Test/Api/PaymentDetailTest.php
+++ b/tests/PayPal/Test/Api/PaymentDetailTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\PaymentDetail;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class PaymentDetail
  *
  * @package PayPal\Test\Api
  */
-class PaymentDetailTest extends \PHPUnit_Framework_TestCase
+class PaymentDetailTest extends TestCase
 {
     /**
      * Gets Json String of Object PaymentDetail
diff --git a/tests/PayPal/Test/Api/PaymentExecutionTest.php b/tests/PayPal/Test/Api/PaymentExecutionTest.php
index 71b15514..bc1cc329 100644
--- a/tests/PayPal/Test/Api/PaymentExecutionTest.php
+++ b/tests/PayPal/Test/Api/PaymentExecutionTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\PaymentExecution;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class PaymentExecution
  *
  * @package PayPal\Test\Api
  */
-class PaymentExecutionTest extends \PHPUnit_Framework_TestCase
+class PaymentExecutionTest extends TestCase
 {
     /**
      * Gets Json String of Object PaymentExecution
diff --git a/tests/PayPal/Test/Api/PaymentHistoryTest.php b/tests/PayPal/Test/Api/PaymentHistoryTest.php
index 9ad748a7..7cad0ada 100644
--- a/tests/PayPal/Test/Api/PaymentHistoryTest.php
+++ b/tests/PayPal/Test/Api/PaymentHistoryTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\PaymentHistory;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class PaymentHistory
  *
  * @package PayPal\Test\Api
  */
-class PaymentHistoryTest extends \PHPUnit_Framework_TestCase
+class PaymentHistoryTest extends TestCase
 {
     /**
      * Gets Json String of Object PaymentHistory
diff --git a/tests/PayPal/Test/Api/PaymentInstructionTest.php b/tests/PayPal/Test/Api/PaymentInstructionTest.php
index d153d356..e58c6f84 100644
--- a/tests/PayPal/Test/Api/PaymentInstructionTest.php
+++ b/tests/PayPal/Test/Api/PaymentInstructionTest.php
@@ -4,13 +4,14 @@
 
 use PayPal\Api\PaymentInstruction;
 use PayPal\Transport\PPRestCall;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class PaymentInstruction
  *
  * @package PayPal\Test\Api
  */
-class PaymentInstructionTest extends \PHPUnit_Framework_TestCase
+class PaymentInstructionTest extends TestCase
 {
     /**
      * Gets Json String of Object PaymentInstruction
diff --git a/tests/PayPal/Test/Api/PaymentOptionsTest.php b/tests/PayPal/Test/Api/PaymentOptionsTest.php
index 31eb9f07..5127524e 100644
--- a/tests/PayPal/Test/Api/PaymentOptionsTest.php
+++ b/tests/PayPal/Test/Api/PaymentOptionsTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\PaymentOptions;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class PaymentOptions
  *
  * @package PayPal\Test\Api
  */
-class PaymentOptionsTest extends \PHPUnit_Framework_TestCase
+class PaymentOptionsTest extends TestCase
 {
     /**
      * Gets Json String of Object PaymentOptions
diff --git a/tests/PayPal/Test/Api/PaymentSummaryTest.php b/tests/PayPal/Test/Api/PaymentSummaryTest.php
index b7459003..16596464 100644
--- a/tests/PayPal/Test/Api/PaymentSummaryTest.php
+++ b/tests/PayPal/Test/Api/PaymentSummaryTest.php
@@ -4,13 +4,14 @@
 
 use PayPal\Common\PayPalModel;
 use PayPal\Api\PaymentSummary;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class PaymentSummary
  *
  * @package PayPal\Test\Api
  */
-class PaymentSummaryTest extends \PHPUnit_Framework_TestCase
+class PaymentSummaryTest extends TestCase
 {
     /**
      * Gets Json String of Object PaymentSummary
diff --git a/tests/PayPal/Test/Api/PaymentTermTest.php b/tests/PayPal/Test/Api/PaymentTermTest.php
index f5593e7a..5587a67f 100644
--- a/tests/PayPal/Test/Api/PaymentTermTest.php
+++ b/tests/PayPal/Test/Api/PaymentTermTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\PaymentTerm;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class PaymentTerm
  *
  * @package PayPal\Test\Api
  */
-class PaymentTermTest extends \PHPUnit_Framework_TestCase
+class PaymentTermTest extends TestCase
 {
     /**
      * Gets Json String of Object PaymentTerm
diff --git a/tests/PayPal/Test/Api/PaymentTest.php b/tests/PayPal/Test/Api/PaymentTest.php
index 9f2e67e5..3a72d7a8 100644
--- a/tests/PayPal/Test/Api/PaymentTest.php
+++ b/tests/PayPal/Test/Api/PaymentTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\Payment;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class Payment
  *
  * @package PayPal\Test\Api
  */
-class PaymentTest extends \PHPUnit_Framework_TestCase
+class PaymentTest extends TestCase
 {
     /**
      * Gets Json String of Object Payment
diff --git a/tests/PayPal/Test/Api/PayoutBatchHeaderTest.php b/tests/PayPal/Test/Api/PayoutBatchHeaderTest.php
index 6b44c25e..c5d4d193 100644
--- a/tests/PayPal/Test/Api/PayoutBatchHeaderTest.php
+++ b/tests/PayPal/Test/Api/PayoutBatchHeaderTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\PayoutBatchHeader;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class PayoutBatchHeader
  *
  * @package PayPal\Test\Api
  */
-class PayoutBatchHeaderTest extends \PHPUnit_Framework_TestCase
+class PayoutBatchHeaderTest extends TestCase
 {
     /**
      * Gets Json String of Object PayoutBatchHeader
diff --git a/tests/PayPal/Test/Api/PayoutBatchTest.php b/tests/PayPal/Test/Api/PayoutBatchTest.php
index f8c8b2ba..c7d1aadc 100644
--- a/tests/PayPal/Test/Api/PayoutBatchTest.php
+++ b/tests/PayPal/Test/Api/PayoutBatchTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\PayoutBatch;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class PayoutBatch
  *
  * @package PayPal\Test\Api
  */
-class PayoutBatchTest extends \PHPUnit_Framework_TestCase
+class PayoutBatchTest extends TestCase
 {
     /**
      * Gets Json String of Object PayoutBatch
diff --git a/tests/PayPal/Test/Api/PayoutItemDetailsTest.php b/tests/PayPal/Test/Api/PayoutItemDetailsTest.php
index 0db1a552..d021f3c3 100644
--- a/tests/PayPal/Test/Api/PayoutItemDetailsTest.php
+++ b/tests/PayPal/Test/Api/PayoutItemDetailsTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\PayoutItemDetails;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class PayoutItemDetails
  *
  * @package PayPal\Test\Api
  */
-class PayoutItemDetailsTest extends \PHPUnit_Framework_TestCase
+class PayoutItemDetailsTest extends TestCase
 {
     /**
      * Gets Json String of Object PayoutItemDetails
diff --git a/tests/PayPal/Test/Api/PayoutItemTest.php b/tests/PayPal/Test/Api/PayoutItemTest.php
index f15d8847..aa42053e 100644
--- a/tests/PayPal/Test/Api/PayoutItemTest.php
+++ b/tests/PayPal/Test/Api/PayoutItemTest.php
@@ -5,13 +5,14 @@
 use PayPal\Api\ItemsArray;
 use PayPal\Api\PayoutItem;
 use PayPal\Transport\PPRestCall;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class PayoutItem
  *
  * @package PayPal\Test\Api
  */
-class PayoutItemTest extends \PHPUnit_Framework_TestCase
+class PayoutItemTest extends TestCase
 {
     /**
      * Gets Json String of Object PayoutItem
diff --git a/tests/PayPal/Test/Api/PayoutSenderBatchHeaderTest.php b/tests/PayPal/Test/Api/PayoutSenderBatchHeaderTest.php
index 0a0a823d..8447c870 100644
--- a/tests/PayPal/Test/Api/PayoutSenderBatchHeaderTest.php
+++ b/tests/PayPal/Test/Api/PayoutSenderBatchHeaderTest.php
@@ -4,13 +4,14 @@
 
 use PayPal\Common\PayPalModel;
 use PayPal\Api\PayoutSenderBatchHeader;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class PayoutSenderBatchHeader
  *
  * @package PayPal\Test\Api
  */
-class PayoutSenderBatchHeaderTest extends \PHPUnit_Framework_TestCase
+class PayoutSenderBatchHeaderTest extends TestCase
 {
     /**
      * Gets Json String of Object PayoutSenderBatchHeader
diff --git a/tests/PayPal/Test/Api/PayoutTest.php b/tests/PayPal/Test/Api/PayoutTest.php
index 155e12e6..efc7b895 100644
--- a/tests/PayPal/Test/Api/PayoutTest.php
+++ b/tests/PayPal/Test/Api/PayoutTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\Payout;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class Payout
  *
  * @package PayPal\Test\Api
  */
-class PayoutTest extends \PHPUnit_Framework_TestCase
+class PayoutTest extends TestCase
 {
     /**
      * Gets Json String of Object Payout
diff --git a/tests/PayPal/Test/Api/PhoneTest.php b/tests/PayPal/Test/Api/PhoneTest.php
index 258f3277..6cbb566f 100644
--- a/tests/PayPal/Test/Api/PhoneTest.php
+++ b/tests/PayPal/Test/Api/PhoneTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\Phone;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class Phone
  *
  * @package PayPal\Test\Api
  */
-class PhoneTest extends \PHPUnit_Framework_TestCase
+class PhoneTest extends TestCase
 {
     /**
      * Gets Json String of Object Phone
diff --git a/tests/PayPal/Test/Api/PlanListTest.php b/tests/PayPal/Test/Api/PlanListTest.php
index 3015ffd7..db4afb7c 100644
--- a/tests/PayPal/Test/Api/PlanListTest.php
+++ b/tests/PayPal/Test/Api/PlanListTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\PlanList;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class PlanList
  *
  * @package PayPal\Test\Api
  */
-class PlanListTest extends \PHPUnit_Framework_TestCase
+class PlanListTest extends TestCase
 {
     /**
      * Gets Json String of Object PlanList
diff --git a/tests/PayPal/Test/Api/PlanTest.php b/tests/PayPal/Test/Api/PlanTest.php
index bb78481e..9b372979 100644
--- a/tests/PayPal/Test/Api/PlanTest.php
+++ b/tests/PayPal/Test/Api/PlanTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\Plan;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class Plan
  *
  * @package PayPal\Test\Api
  */
-class PlanTest extends \PHPUnit_Framework_TestCase
+class PlanTest extends TestCase
 {
     /**
      * Gets Json String of Object Plan
diff --git a/tests/PayPal/Test/Api/PotentialPayerInfoTest.php b/tests/PayPal/Test/Api/PotentialPayerInfoTest.php
index 97b79040..1d124180 100644
--- a/tests/PayPal/Test/Api/PotentialPayerInfoTest.php
+++ b/tests/PayPal/Test/Api/PotentialPayerInfoTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\PotentialPayerInfo;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class PotentialPayerInfo
  *
  * @package PayPal\Test\Api
  */
-class PotentialPayerInfoTest extends \PHPUnit_Framework_TestCase
+class PotentialPayerInfoTest extends TestCase
 {
     /**
      * Gets Json String of Object PotentialPayerInfo
diff --git a/tests/PayPal/Test/Api/PresentationTest.php b/tests/PayPal/Test/Api/PresentationTest.php
index 0a81009a..12b55772 100644
--- a/tests/PayPal/Test/Api/PresentationTest.php
+++ b/tests/PayPal/Test/Api/PresentationTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\Presentation;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class Presentation
  *
  * @package PayPal\Test\Api
  */
-class PresentationTest extends \PHPUnit_Framework_TestCase
+class PresentationTest extends TestCase
 {
     /**
      * Gets Json String of Object Presentation
diff --git a/tests/PayPal/Test/Api/PrivateLabelCardTest.php b/tests/PayPal/Test/Api/PrivateLabelCardTest.php
index e76023c3..34da187e 100644
--- a/tests/PayPal/Test/Api/PrivateLabelCardTest.php
+++ b/tests/PayPal/Test/Api/PrivateLabelCardTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\PrivateLabelCard;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class PrivateLabelCard
  *
  * @package PayPal\Test\Api
  */
-class PrivateLabelCardTest extends \PHPUnit_Framework_TestCase
+class PrivateLabelCardTest extends TestCase
 {
     /**
      * Gets Json String of Object PrivateLabelCard
diff --git a/tests/PayPal/Test/Api/ProcessorResponseTest.php b/tests/PayPal/Test/Api/ProcessorResponseTest.php
index c88d2f6e..db38ad7d 100644
--- a/tests/PayPal/Test/Api/ProcessorResponseTest.php
+++ b/tests/PayPal/Test/Api/ProcessorResponseTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\ProcessorResponse;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class ProcessorResponse
  *
  * @package PayPal\Test\Api
  */
-class ProcessorResponseTest extends \PHPUnit_Framework_TestCase
+class ProcessorResponseTest extends TestCase
 {
     /**
      * Gets Json String of Object ProcessorResponse
diff --git a/tests/PayPal/Test/Api/RecipientBankingInstructionTest.php b/tests/PayPal/Test/Api/RecipientBankingInstructionTest.php
index 93c481cd..6d42f529 100644
--- a/tests/PayPal/Test/Api/RecipientBankingInstructionTest.php
+++ b/tests/PayPal/Test/Api/RecipientBankingInstructionTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\RecipientBankingInstruction;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class RecipientBankingInstruction
  *
  * @package PayPal\Test\Api
  */
-class RecipientBankingInstructionTest extends \PHPUnit_Framework_TestCase
+class RecipientBankingInstructionTest extends TestCase
 {
     /**
      * Gets Json String of Object RecipientBankingInstruction
diff --git a/tests/PayPal/Test/Api/RedirectUrlsTest.php b/tests/PayPal/Test/Api/RedirectUrlsTest.php
index 890312c2..6a40990a 100644
--- a/tests/PayPal/Test/Api/RedirectUrlsTest.php
+++ b/tests/PayPal/Test/Api/RedirectUrlsTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\RedirectUrls;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class RedirectUrls
  *
  * @package PayPal\Test\Api
  */
-class RedirectUrlsTest extends \PHPUnit_Framework_TestCase
+class RedirectUrlsTest extends TestCase
 {
     /**
      * Gets Json String of Object RedirectUrls
diff --git a/tests/PayPal/Test/Api/RefundDetailTest.php b/tests/PayPal/Test/Api/RefundDetailTest.php
index ec66a40c..71ab7c9b 100644
--- a/tests/PayPal/Test/Api/RefundDetailTest.php
+++ b/tests/PayPal/Test/Api/RefundDetailTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\RefundDetail;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class RefundDetail
  *
  * @package PayPal\Test\Api
  */
-class RefundDetailTest extends \PHPUnit_Framework_TestCase
+class RefundDetailTest extends TestCase
 {
     /**
      * Gets Json String of Object RefundDetail
diff --git a/tests/PayPal/Test/Api/RefundRequestTest.php b/tests/PayPal/Test/Api/RefundRequestTest.php
index ba446768..89695ca9 100644
--- a/tests/PayPal/Test/Api/RefundRequestTest.php
+++ b/tests/PayPal/Test/Api/RefundRequestTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\RefundRequest;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class RefundRequest
  *
  * @package PayPal\Test\Api
  */
-class RefundRequestTest extends \PHPUnit_Framework_TestCase
+class RefundRequestTest extends TestCase
 {
     /**
      * Gets Json String of Object RefundRequest
diff --git a/tests/PayPal/Test/Api/RefundTest.php b/tests/PayPal/Test/Api/RefundTest.php
index c7a5d8fe..c80ba61b 100644
--- a/tests/PayPal/Test/Api/RefundTest.php
+++ b/tests/PayPal/Test/Api/RefundTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\Refund;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class Refund
  *
  * @package PayPal\Test\Api
  */
-class RefundTest extends \PHPUnit_Framework_TestCase
+class RefundTest extends TestCase
 {
     /**
      * Gets Json String of Object Refund
diff --git a/tests/PayPal/Test/Api/RelatedResourcesTest.php b/tests/PayPal/Test/Api/RelatedResourcesTest.php
index e7ad6847..a02d64dd 100644
--- a/tests/PayPal/Test/Api/RelatedResourcesTest.php
+++ b/tests/PayPal/Test/Api/RelatedResourcesTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\RelatedResources;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class RelatedResources
  *
  * @package PayPal\Test\Api
  */
-class RelatedResourcesTest extends \PHPUnit_Framework_TestCase
+class RelatedResourcesTest extends TestCase
 {
     /**
      * Gets Json String of Object RelatedResources
diff --git a/tests/PayPal/Test/Api/SaleTest.php b/tests/PayPal/Test/Api/SaleTest.php
index 3afb3e6f..dfae558d 100644
--- a/tests/PayPal/Test/Api/SaleTest.php
+++ b/tests/PayPal/Test/Api/SaleTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\Sale;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class Sale
  *
  * @package PayPal\Test\Api
  */
-class SaleTest extends \PHPUnit_Framework_TestCase
+class SaleTest extends TestCase
 {
     /**
      * Gets Json String of Object Sale
diff --git a/tests/PayPal/Test/Api/SearchTest.php b/tests/PayPal/Test/Api/SearchTest.php
index 60bd56cf..6239d7a8 100644
--- a/tests/PayPal/Test/Api/SearchTest.php
+++ b/tests/PayPal/Test/Api/SearchTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\Search;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class Search
  *
  * @package PayPal\Test\Api
  */
-class SearchTest extends \PHPUnit_Framework_TestCase
+class SearchTest extends TestCase
 {
     /**
      * Gets Json String of Object Search
diff --git a/tests/PayPal/Test/Api/ShippingAddressTest.php b/tests/PayPal/Test/Api/ShippingAddressTest.php
index 9fa01a42..e8afc092 100644
--- a/tests/PayPal/Test/Api/ShippingAddressTest.php
+++ b/tests/PayPal/Test/Api/ShippingAddressTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\ShippingAddress;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class ShippingAddress
  *
  * @package PayPal\Test\Api
  */
-class ShippingAddressTest extends \PHPUnit_Framework_TestCase
+class ShippingAddressTest extends TestCase
 {
     /**
      * Gets Json String of Object ShippingAddress
diff --git a/tests/PayPal/Test/Api/ShippingCostTest.php b/tests/PayPal/Test/Api/ShippingCostTest.php
index 2de4b359..79556738 100644
--- a/tests/PayPal/Test/Api/ShippingCostTest.php
+++ b/tests/PayPal/Test/Api/ShippingCostTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\ShippingCost;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class ShippingCost
  *
  * @package PayPal\Test\Api
  */
-class ShippingCostTest extends \PHPUnit_Framework_TestCase
+class ShippingCostTest extends TestCase
 {
     /**
      * Gets Json String of Object ShippingCost
diff --git a/tests/PayPal/Test/Api/ShippingInfoTest.php b/tests/PayPal/Test/Api/ShippingInfoTest.php
index c62ea327..9f30ed86 100644
--- a/tests/PayPal/Test/Api/ShippingInfoTest.php
+++ b/tests/PayPal/Test/Api/ShippingInfoTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\ShippingInfo;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class ShippingInfo
  *
  * @package PayPal\Test\Api
  */
-class ShippingInfoTest extends \PHPUnit_Framework_TestCase
+class ShippingInfoTest extends TestCase
 {
     /**
      * Gets Json String of Object ShippingInfo
diff --git a/tests/PayPal/Test/Api/TaxTest.php b/tests/PayPal/Test/Api/TaxTest.php
index 3a6b7b29..cf8ee28f 100644
--- a/tests/PayPal/Test/Api/TaxTest.php
+++ b/tests/PayPal/Test/Api/TaxTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\Tax;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class Tax
  *
  * @package PayPal\Test\Api
  */
-class TaxTest extends \PHPUnit_Framework_TestCase
+class TaxTest extends TestCase
 {
     /**
      * Gets Json String of Object Tax
diff --git a/tests/PayPal/Test/Api/TemplateDataTest.php b/tests/PayPal/Test/Api/TemplateDataTest.php
index d1aa55f6..0b03b80e 100644
--- a/tests/PayPal/Test/Api/TemplateDataTest.php
+++ b/tests/PayPal/Test/Api/TemplateDataTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\TemplateData;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class TemplateData
  *
  * @package PayPal\Test\Api
  */
-class TemplateDataTest extends \PHPUnit_Framework_TestCase
+class TemplateDataTest extends TestCase
 {
     /**
      * Gets Json String of Object TemplateData
diff --git a/tests/PayPal/Test/Api/TemplateSettingsMetadataTest.php b/tests/PayPal/Test/Api/TemplateSettingsMetadataTest.php
index f3354851..c7f2ab34 100644
--- a/tests/PayPal/Test/Api/TemplateSettingsMetadataTest.php
+++ b/tests/PayPal/Test/Api/TemplateSettingsMetadataTest.php
@@ -4,13 +4,14 @@
 
 use PayPal\Common\PayPalModel;
 use PayPal\Api\TemplateSettingsMetadata;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class TemplateSettingsMetadata
  *
  * @package PayPal\Test\Api
  */
-class TemplateSettingsMetadataTest extends \PHPUnit_Framework_TestCase
+class TemplateSettingsMetadataTest extends TestCase
 {
     /**
      * Gets Json String of Object TemplateSettingsMetadata
diff --git a/tests/PayPal/Test/Api/TemplateSettingsTest.php b/tests/PayPal/Test/Api/TemplateSettingsTest.php
index d79eca0d..f9d661dd 100644
--- a/tests/PayPal/Test/Api/TemplateSettingsTest.php
+++ b/tests/PayPal/Test/Api/TemplateSettingsTest.php
@@ -4,13 +4,14 @@
 
 use PayPal\Common\PayPalModel;
 use PayPal\Api\TemplateSettings;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class TemplateSettings
  *
  * @package PayPal\Test\Api
  */
-class TemplateSettingsTest extends \PHPUnit_Framework_TestCase
+class TemplateSettingsTest extends TestCase
 {
     /**
      * Gets Json String of Object TemplateSettings
diff --git a/tests/PayPal/Test/Api/TemplateTest.php b/tests/PayPal/Test/Api/TemplateTest.php
index 7a25a78e..b70eda27 100644
--- a/tests/PayPal/Test/Api/TemplateTest.php
+++ b/tests/PayPal/Test/Api/TemplateTest.php
@@ -4,13 +4,14 @@
 
 use PayPal\Common\PayPalModel;
 use PayPal\Api\Template;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class Template
  *
  * @package PayPal\Test\Api
  */
-class TemplateTest extends \PHPUnit_Framework_TestCase
+class TemplateTest extends TestCase
 {
     /**
      * Gets Json String of Object Template
diff --git a/tests/PayPal/Test/Api/TemplatesTest.php b/tests/PayPal/Test/Api/TemplatesTest.php
index 08c370ae..43f8c6de 100644
--- a/tests/PayPal/Test/Api/TemplatesTest.php
+++ b/tests/PayPal/Test/Api/TemplatesTest.php
@@ -7,13 +7,14 @@
 use PayPal\Api\Template;
 use PayPal\Rest\ApiContext;
 use PayPal\Api\Templates;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class Templates
  *
  * @package PayPal\Test\Api
  */
-class TemplatesTest extends \PHPUnit_Framework_TestCase
+class TemplatesTest extends TestCase
 {
     /**
      * Gets Json String of Object Templates
diff --git a/tests/PayPal/Test/Api/TermsTest.php b/tests/PayPal/Test/Api/TermsTest.php
index 0c925ab4..668e8f0f 100644
--- a/tests/PayPal/Test/Api/TermsTest.php
+++ b/tests/PayPal/Test/Api/TermsTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\Terms;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class Terms
  *
  * @package PayPal\Test\Api
  */
-class TermsTest extends \PHPUnit_Framework_TestCase
+class TermsTest extends TestCase
 {
     /**
      * Gets Json String of Object Terms
diff --git a/tests/PayPal/Test/Api/TransactionTest.php b/tests/PayPal/Test/Api/TransactionTest.php
index e5198377..3715f4ea 100644
--- a/tests/PayPal/Test/Api/TransactionTest.php
+++ b/tests/PayPal/Test/Api/TransactionTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\Transaction;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class Transaction
  *
  * @package PayPal\Test\Api
  */
-class TransactionTest extends \PHPUnit_Framework_TestCase
+class TransactionTest extends TestCase
 {
     /**
      * Gets Json String of Object Transaction
diff --git a/tests/PayPal/Test/Api/VerifyWebhookSignatureResponseTest.php b/tests/PayPal/Test/Api/VerifyWebhookSignatureResponseTest.php
index c7560f22..c8946fce 100644
--- a/tests/PayPal/Test/Api/VerifyWebhookSignatureResponseTest.php
+++ b/tests/PayPal/Test/Api/VerifyWebhookSignatureResponseTest.php
@@ -4,13 +4,14 @@
 
 use PayPal\Common\PayPalModel;
 use PayPal\Api\VerifyWebhookSignatureResponse;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class VerifyWebhookSignatureResponse
  *
  * @package PayPal\Test\Api
  */
-class VerifyWebhookSignatureResponseTest extends \PHPUnit_Framework_TestCase
+class VerifyWebhookSignatureResponseTest extends TestCase
 {
     /**
      * Gets Json String of Object VerifyWebhookSignatureResponse
diff --git a/tests/PayPal/Test/Api/VerifyWebhookSignatureTest.php b/tests/PayPal/Test/Api/VerifyWebhookSignatureTest.php
index a422faac..f2026314 100644
--- a/tests/PayPal/Test/Api/VerifyWebhookSignatureTest.php
+++ b/tests/PayPal/Test/Api/VerifyWebhookSignatureTest.php
@@ -7,13 +7,14 @@
 use PayPal\Api\VerifyWebhookSignatureResponse;
 use PayPal\Rest\ApiContext;
 use PayPal\Api\VerifyWebhookSignature;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class VerifyWebhookSignature
  *
  * @package PayPal\Test\Api
  */
-class VerifyWebhookSignatureTest extends \PHPUnit_Framework_TestCase
+class VerifyWebhookSignatureTest extends TestCase
 {
     /**
      * Gets Json String of Object VerifyWebhookSignature
diff --git a/tests/PayPal/Test/Api/WebProfileTest.php b/tests/PayPal/Test/Api/WebProfileTest.php
index 66623bc7..8f441be3 100644
--- a/tests/PayPal/Test/Api/WebProfileTest.php
+++ b/tests/PayPal/Test/Api/WebProfileTest.php
@@ -3,13 +3,14 @@
 namespace PayPal\Test\Api;
 
 use PayPal\Api\WebProfile;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class WebProfile
  *
  * @package PayPal\Test\Api
  */
-class WebProfileTest extends \PHPUnit_Framework_TestCase
+class WebProfileTest extends TestCase
 {
     /**
      * Gets Json String of Object WebProfile
diff --git a/tests/PayPal/Test/Api/WebhookEventListTest.php b/tests/PayPal/Test/Api/WebhookEventListTest.php
index 2e47b1f0..db08fc78 100644
--- a/tests/PayPal/Test/Api/WebhookEventListTest.php
+++ b/tests/PayPal/Test/Api/WebhookEventListTest.php
@@ -4,13 +4,14 @@
 
 use PayPal\Common\PayPalModel;
 use PayPal\Api\WebhookEventList;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class WebhookEventList
  *
  * @package PayPal\Test\Api
  */
-class WebhookEventListTest extends \PHPUnit_Framework_TestCase
+class WebhookEventListTest extends TestCase
 {
     /**
      * Gets Json String of Object WebhookEventList
diff --git a/tests/PayPal/Test/Api/WebhookEventTest.php b/tests/PayPal/Test/Api/WebhookEventTest.php
index 7453dee8..cb58ff02 100644
--- a/tests/PayPal/Test/Api/WebhookEventTest.php
+++ b/tests/PayPal/Test/Api/WebhookEventTest.php
@@ -7,13 +7,14 @@
 use PayPal\Api\WebhookEventList;
 use PayPal\Rest\ApiContext;
 use PayPal\Api\WebhookEvent;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class WebhookEvent
  *
  * @package PayPal\Test\Api
  */
-class WebhookEventTest extends \PHPUnit_Framework_TestCase
+class WebhookEventTest extends TestCase
 {
     /**
      * Gets Json String of Object WebhookEvent
diff --git a/tests/PayPal/Test/Api/WebhookEventTypeListTest.php b/tests/PayPal/Test/Api/WebhookEventTypeListTest.php
index 339e1a3f..4f3bfda4 100644
--- a/tests/PayPal/Test/Api/WebhookEventTypeListTest.php
+++ b/tests/PayPal/Test/Api/WebhookEventTypeListTest.php
@@ -4,13 +4,14 @@
 
 use PayPal\Common\PayPalModel;
 use PayPal\Api\WebhookEventTypeList;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class WebhookEventTypeList
  *
  * @package PayPal\Test\Api
  */
-class WebhookEventTypeListTest extends \PHPUnit_Framework_TestCase
+class WebhookEventTypeListTest extends TestCase
 {
     /**
      * Gets Json String of Object WebhookEventTypeList
diff --git a/tests/PayPal/Test/Api/WebhookEventTypeTest.php b/tests/PayPal/Test/Api/WebhookEventTypeTest.php
index 801053b7..b138fc2d 100644
--- a/tests/PayPal/Test/Api/WebhookEventTypeTest.php
+++ b/tests/PayPal/Test/Api/WebhookEventTypeTest.php
@@ -7,13 +7,14 @@
 use PayPal\Api\WebhookEventTypeList;
 use PayPal\Rest\ApiContext;
 use PayPal\Api\WebhookEventType;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class WebhookEventType
  *
  * @package PayPal\Test\Api
  */
-class WebhookEventTypeTest extends \PHPUnit_Framework_TestCase
+class WebhookEventTypeTest extends TestCase
 {
     /**
      * Gets Json String of Object WebhookEventType
diff --git a/tests/PayPal/Test/Api/WebhookListTest.php b/tests/PayPal/Test/Api/WebhookListTest.php
index 6a169175..96b3f712 100644
--- a/tests/PayPal/Test/Api/WebhookListTest.php
+++ b/tests/PayPal/Test/Api/WebhookListTest.php
@@ -4,13 +4,14 @@
 
 use PayPal\Common\PayPalModel;
 use PayPal\Api\WebhookList;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class WebhookList
  *
  * @package PayPal\Test\Api
  */
-class WebhookListTest extends \PHPUnit_Framework_TestCase
+class WebhookListTest extends TestCase
 {
     /**
      * Gets Json String of Object WebhookList
diff --git a/tests/PayPal/Test/Api/WebhookTest.php b/tests/PayPal/Test/Api/WebhookTest.php
index e94678ea..6065dd23 100644
--- a/tests/PayPal/Test/Api/WebhookTest.php
+++ b/tests/PayPal/Test/Api/WebhookTest.php
@@ -7,13 +7,14 @@
 use PayPal\Api\WebhookList;
 use PayPal\Rest\ApiContext;
 use PayPal\Api\Webhook;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class Webhook
  *
  * @package PayPal\Test\Api
  */
-class WebhookTest extends \PHPUnit_Framework_TestCase
+class WebhookTest extends TestCase
 {
     /**
      * Gets Json String of Object Webhook
diff --git a/tests/PayPal/Test/Auth/OAuthTokenCredentialTest.php b/tests/PayPal/Test/Auth/OAuthTokenCredentialTest.php
index 9317228a..1b56b90d 100644
--- a/tests/PayPal/Test/Auth/OAuthTokenCredentialTest.php
+++ b/tests/PayPal/Test/Auth/OAuthTokenCredentialTest.php
@@ -8,8 +8,9 @@
 use PayPal\Rest\ApiContext;
 use PayPal\Test\Cache\AuthorizationCacheTest;
 use PayPal\Test\Constants;
+use PHPUnit\Framework\TestCase;
 
-class OAuthTokenCredentialTest extends \PHPUnit_Framework_TestCase
+class OAuthTokenCredentialTest extends TestCase
 {
 
     /**
diff --git a/tests/PayPal/Test/Cache/AuthorizationCacheTest.php b/tests/PayPal/Test/Cache/AuthorizationCacheTest.php
index 329fff7d..d4284dcc 100644
--- a/tests/PayPal/Test/Cache/AuthorizationCacheTest.php
+++ b/tests/PayPal/Test/Cache/AuthorizationCacheTest.php
@@ -3,12 +3,13 @@
 namespace PayPal\Test\Cache;
 
 use PayPal\Cache\AuthorizationCache;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Test class for AuthorizationCacheTest.
  *
  */
-class AuthorizationCacheTest extends \PHPUnit_Framework_TestCase
+class AuthorizationCacheTest extends TestCase
 {
     const CACHE_FILE = 'tests/var/test.cache';
 
diff --git a/tests/PayPal/Test/Common/ArrayUtilTest.php b/tests/PayPal/Test/Common/ArrayUtilTest.php
index bdd30fe1..ec2d0345 100644
--- a/tests/PayPal/Test/Common/ArrayUtilTest.php
+++ b/tests/PayPal/Test/Common/ArrayUtilTest.php
@@ -2,8 +2,9 @@
 namespace PayPal\Test\Common;
 
 use PayPal\Common\ArrayUtil;
+use PHPUnit\Framework\TestCase;
 
-class ArrayUtilTest extends \PHPUnit_Framework_TestCase
+class ArrayUtilTest extends TestCase
 {
 
     public function testIsAssocArray()
diff --git a/tests/PayPal/Test/Common/FormatConverterTest.php b/tests/PayPal/Test/Common/FormatConverterTest.php
index b3c5f83b..366b5c19 100644
--- a/tests/PayPal/Test/Common/FormatConverterTest.php
+++ b/tests/PayPal/Test/Common/FormatConverterTest.php
@@ -10,8 +10,9 @@
 use PayPal\Common\PayPalModel;
 use PayPal\Converter\FormatConverter;
 use PayPal\Test\Validation\NumericValidatorTest;
+use PHPUnit\Framework\TestCase;
 
-class FormatConverterTest extends \PHPUnit_Framework_TestCase
+class FormatConverterTest extends TestCase
 {
 
     public static function classMethodListProvider()
diff --git a/tests/PayPal/Test/Common/ModelTest.php b/tests/PayPal/Test/Common/ModelTest.php
index 230c80e0..42ac8a8d 100644
--- a/tests/PayPal/Test/Common/ModelTest.php
+++ b/tests/PayPal/Test/Common/ModelTest.php
@@ -4,8 +4,9 @@
 use PayPal\Api\Payment;
 use PayPal\Common\PayPalModel;
 use PayPal\Core\PayPalConfigManager;
+use PHPUnit\Framework\TestCase;
 
-class ModelTest extends \PHPUnit_Framework_TestCase
+class ModelTest extends TestCase
 {
 
     public function testSimpleClassConversion()
diff --git a/tests/PayPal/Test/Common/PayPalModelTest.php b/tests/PayPal/Test/Common/PayPalModelTest.php
index c67b346a..189a490c 100644
--- a/tests/PayPal/Test/Common/PayPalModelTest.php
+++ b/tests/PayPal/Test/Common/PayPalModelTest.php
@@ -1,6 +1,7 @@
 <?php
 
 use PayPal\Common\PayPalModel;
+use PHPUnit\Framework\TestCase;
 
 class SimpleModelTestClass extends PayPalModel
 {
@@ -145,7 +146,7 @@ public function getList2()
  * Test class for PayPalModel.
  *
  */
-class PayPalModelTest extends PHPUnit_Framework_TestCase
+class PayPalModelTest extends TestCase
 {
     /**
      * Sets up the fixture, for example, opens a network connection.
diff --git a/tests/PayPal/Test/Common/UserAgentTest.php b/tests/PayPal/Test/Common/UserAgentTest.php
index 116561b4..2064c7cb 100644
--- a/tests/PayPal/Test/Common/UserAgentTest.php
+++ b/tests/PayPal/Test/Common/UserAgentTest.php
@@ -1,8 +1,9 @@
 <?php
 
 use PayPal\Common\PayPalUserAgent;
+use PHPUnit\Framework\TestCase;
 
-class UserAgentTest extends PHPUnit_Framework_TestCase
+class UserAgentTest extends TestCase
 {
 
     public function testGetValue()
diff --git a/tests/PayPal/Test/Core/PPConfigManagerTest.php.skipped b/tests/PayPal/Test/Core/PPConfigManagerTest.php.skipped
index 1f30eaf2..05d794fa 100644
--- a/tests/PayPal/Test/Core/PPConfigManagerTest.php.skipped
+++ b/tests/PayPal/Test/Core/PPConfigManagerTest.php.skipped
@@ -1,7 +1,8 @@
 <?php
 use PayPal\Core\PayPalConfigManager;
+use PHPUnit\Framework\TestCase;
 
-class PPConfigManagerTest extends \PHPUnit_Framework_TestCase
+class PPConfigManagerTest extends TestCase
 {
     /**
      * @var PayPalConfigManager
diff --git a/tests/PayPal/Test/Core/PayPalCredentialManagerTest.php b/tests/PayPal/Test/Core/PayPalCredentialManagerTest.php
index f87f5520..433b6389 100644
--- a/tests/PayPal/Test/Core/PayPalCredentialManagerTest.php
+++ b/tests/PayPal/Test/Core/PayPalCredentialManagerTest.php
@@ -1,12 +1,13 @@
 <?php
 use PayPal\Core\PayPalCredentialManager;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Test class for PayPalCredentialManager.
  *
  * @runTestsInSeparateProcesses
  */
-class PayPalCredentialManagerTest extends \PHPUnit_Framework_TestCase
+class PayPalCredentialManagerTest extends TestCase
 {
     /**
      * @var PayPalCredentialManager
diff --git a/tests/PayPal/Test/Core/PayPalHttpConfigTest.php b/tests/PayPal/Test/Core/PayPalHttpConfigTest.php
index c3318b3e..3cda79d6 100644
--- a/tests/PayPal/Test/Core/PayPalHttpConfigTest.php
+++ b/tests/PayPal/Test/Core/PayPalHttpConfigTest.php
@@ -3,12 +3,13 @@
 namespace PayPal\Test\Core;
 
 use PayPal\Core\PayPalHttpConfig;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Test class for PayPalHttpConfigTest.
  *
  */
-class PayPalHttpConfigTest extends \PHPUnit_Framework_TestCase
+class PayPalHttpConfigTest extends TestCase
 {
 
     protected $object;
diff --git a/tests/PayPal/Test/Core/PayPalLoggingManagerTest.php b/tests/PayPal/Test/Core/PayPalLoggingManagerTest.php
index f7720e30..47a645fa 100644
--- a/tests/PayPal/Test/Core/PayPalLoggingManagerTest.php
+++ b/tests/PayPal/Test/Core/PayPalLoggingManagerTest.php
@@ -1,11 +1,12 @@
 <?php
 use PayPal\Core\PayPalLoggingManager;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Test class for PayPalLoggingManager.
  *
  */
-class PayPalLoggingManagerTest extends \PHPUnit_Framework_TestCase
+class PayPalLoggingManagerTest extends TestCase
 {
     /**
      * @var PayPalLoggingManager
diff --git a/tests/PayPal/Test/Exception/PayPalConfigurationExceptionTest.php b/tests/PayPal/Test/Exception/PayPalConfigurationExceptionTest.php
index ed57fc07..f49c95ca 100644
--- a/tests/PayPal/Test/Exception/PayPalConfigurationExceptionTest.php
+++ b/tests/PayPal/Test/Exception/PayPalConfigurationExceptionTest.php
@@ -1,11 +1,12 @@
 <?php
 use PayPal\Exception\PayPalConfigurationException;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Test class for PayPalConfigurationException.
  *
  */
-class PayPalConfigurationExceptionTest extends \PHPUnit_Framework_TestCase
+class PayPalConfigurationExceptionTest extends TestCase
 {
     /**
      * @var PayPalConfigurationException
diff --git a/tests/PayPal/Test/Exception/PayPalConnectionExceptionTest.php b/tests/PayPal/Test/Exception/PayPalConnectionExceptionTest.php
index 0b063599..407f6952 100644
--- a/tests/PayPal/Test/Exception/PayPalConnectionExceptionTest.php
+++ b/tests/PayPal/Test/Exception/PayPalConnectionExceptionTest.php
@@ -1,11 +1,12 @@
 <?php
 use PayPal\Exception\PayPalConnectionException;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Test class for PayPalConnectionException.
  *
  */
-class PayPalConnectionExceptionTest extends \PHPUnit_Framework_TestCase
+class PayPalConnectionExceptionTest extends TestCase
 {
     /**
      * @var PayPalConnectionException
diff --git a/tests/PayPal/Test/Exception/PayPalInvalidCredentialExceptionTest.php b/tests/PayPal/Test/Exception/PayPalInvalidCredentialExceptionTest.php
index 88377607..c18a2251 100644
--- a/tests/PayPal/Test/Exception/PayPalInvalidCredentialExceptionTest.php
+++ b/tests/PayPal/Test/Exception/PayPalInvalidCredentialExceptionTest.php
@@ -1,11 +1,12 @@
 <?php
 use PayPal\Exception\PayPalInvalidCredentialException;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Test class for PayPalInvalidCredentialException.
  *
  */
-class PayPalInvalidCredentialExceptionTest extends \PHPUnit_Framework_TestCase
+class PayPalInvalidCredentialExceptionTest extends TestCase
 {
     /**
      * @var PayPalInvalidCredentialException
diff --git a/tests/PayPal/Test/Exception/PayPalMissingCredentialExceptionTest.php b/tests/PayPal/Test/Exception/PayPalMissingCredentialExceptionTest.php
index 1a2af090..0ce74b5c 100644
--- a/tests/PayPal/Test/Exception/PayPalMissingCredentialExceptionTest.php
+++ b/tests/PayPal/Test/Exception/PayPalMissingCredentialExceptionTest.php
@@ -1,11 +1,12 @@
 <?php
 use PayPal\Exception\PayPalMissingCredentialException;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Test class for PayPalMissingCredentialException.
  *
  */
-class PayPalMissingCredentialExceptionTest extends \PHPUnit_Framework_TestCase
+class PayPalMissingCredentialExceptionTest extends TestCase
 {
     /**
      * @var PayPalMissingCredentialException
diff --git a/tests/PayPal/Test/Functional/Api/BillingAgreementsFunctionalTest.php b/tests/PayPal/Test/Functional/Api/BillingAgreementsFunctionalTest.php
index c3a2f53e..d2e676a6 100644
--- a/tests/PayPal/Test/Functional/Api/BillingAgreementsFunctionalTest.php
+++ b/tests/PayPal/Test/Functional/Api/BillingAgreementsFunctionalTest.php
@@ -9,13 +9,14 @@
 use PayPal\Api\PatchRequest;
 use PayPal\Api\Plan;
 use PayPal\Test\Functional\Setup;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class Billing Agreements
  *
  * @package PayPal\Test\Api
  */
-class BillingAgreementsFunctionalTest extends \PHPUnit_Framework_TestCase
+class BillingAgreementsFunctionalTest extends TestCase
 {
 
     public $operation;
diff --git a/tests/PayPal/Test/Functional/Api/BillingPlansFunctionalTest.php b/tests/PayPal/Test/Functional/Api/BillingPlansFunctionalTest.php
index 3c23486c..bdac1c23 100644
--- a/tests/PayPal/Test/Functional/Api/BillingPlansFunctionalTest.php
+++ b/tests/PayPal/Test/Functional/Api/BillingPlansFunctionalTest.php
@@ -6,13 +6,14 @@
 use PayPal\Api\PatchRequest;
 use PayPal\Api\Plan;
 use PayPal\Test\Functional\Setup;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class Billing Plans
  *
  * @package PayPal\Test\Api
  */
-class BillingPlansFunctionalTest extends \PHPUnit_Framework_TestCase
+class BillingPlansFunctionalTest extends TestCase
 {
 
     public static $obj;
diff --git a/tests/PayPal/Test/Functional/Api/InvoiceFunctionalTest.php b/tests/PayPal/Test/Functional/Api/InvoiceFunctionalTest.php
index b3dcf9ac..181a899e 100644
--- a/tests/PayPal/Test/Functional/Api/InvoiceFunctionalTest.php
+++ b/tests/PayPal/Test/Functional/Api/InvoiceFunctionalTest.php
@@ -9,13 +9,14 @@
 use PayPal\Api\RefundDetail;
 use PayPal\Api\Search;
 use PayPal\Test\Functional\Setup;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class Invoice
  *
  * @package PayPal\Test\Api
  */
-class InvoiceFunctionalTest extends \PHPUnit_Framework_TestCase
+class InvoiceFunctionalTest extends TestCase
 {
 
     public static $obj;
diff --git a/tests/PayPal/Test/Functional/Api/PaymentsFunctionalTest.php b/tests/PayPal/Test/Functional/Api/PaymentsFunctionalTest.php
index 8a1ddf46..d81b1e49 100644
--- a/tests/PayPal/Test/Functional/Api/PaymentsFunctionalTest.php
+++ b/tests/PayPal/Test/Functional/Api/PaymentsFunctionalTest.php
@@ -6,13 +6,14 @@
 use PayPal\Api\Refund;
 use PayPal\Api\Sale;
 use PayPal\Test\Functional\Setup;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class WebProfile
  *
  * @package PayPal\Test\Api
  */
-class PaymentsFunctionalTest extends \PHPUnit_Framework_TestCase
+class PaymentsFunctionalTest extends TestCase
 {
 
     public $operation;
diff --git a/tests/PayPal/Test/Functional/Api/PayoutsFunctionalTest.php b/tests/PayPal/Test/Functional/Api/PayoutsFunctionalTest.php
index 4372c1cb..4383ff28 100644
--- a/tests/PayPal/Test/Functional/Api/PayoutsFunctionalTest.php
+++ b/tests/PayPal/Test/Functional/Api/PayoutsFunctionalTest.php
@@ -6,13 +6,14 @@
 use PayPal\Api\PayoutBatch;
 use PayPal\Api\PayoutItem;
 use PayPal\Test\Functional\Setup;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class Payouts
  *
  * @package PayPal\Test\Api
  */
-class PayoutsFunctionalTest extends \PHPUnit_Framework_TestCase
+class PayoutsFunctionalTest extends TestCase
 {
 
     public $operation;
diff --git a/tests/PayPal/Test/Functional/Api/WebProfileFunctionalTest.php b/tests/PayPal/Test/Functional/Api/WebProfileFunctionalTest.php
index f0db4b84..4871fedb 100644
--- a/tests/PayPal/Test/Functional/Api/WebProfileFunctionalTest.php
+++ b/tests/PayPal/Test/Functional/Api/WebProfileFunctionalTest.php
@@ -6,13 +6,14 @@
 use PayPal\Api\Patch;
 use PayPal\Api\WebProfile;
 use PayPal\Test\Functional\Setup;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class WebProfile
  *
  * @package PayPal\Test\Api
  */
-class WebProfileFunctionalTest extends \PHPUnit_Framework_TestCase
+class WebProfileFunctionalTest extends TestCase
 {
 
     public $operation;
diff --git a/tests/PayPal/Test/Functional/Api/WebhookFunctionalTest.php b/tests/PayPal/Test/Functional/Api/WebhookFunctionalTest.php
index cf64ed01..11781d62 100644
--- a/tests/PayPal/Test/Functional/Api/WebhookFunctionalTest.php
+++ b/tests/PayPal/Test/Functional/Api/WebhookFunctionalTest.php
@@ -11,13 +11,14 @@
 use PayPal\Api\WebhookList;
 use PayPal\Exception\PayPalConnectionException;
 use PayPal\Test\Functional\Setup;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class WebhookFunctionalTest
  *
  * @package PayPal\Test\Api
  */
-class WebhookFunctionalTest extends \PHPUnit_Framework_TestCase
+class WebhookFunctionalTest extends TestCase
 {
 
     public $operation;
diff --git a/tests/PayPal/Test/Functional/Setup.php b/tests/PayPal/Test/Functional/Setup.php
index 529ffd04..be034afb 100644
--- a/tests/PayPal/Test/Functional/Setup.php
+++ b/tests/PayPal/Test/Functional/Setup.php
@@ -5,13 +5,14 @@
 use PayPal\Auth\OAuthTokenCredential;
 use PayPal\Core\PayPalCredentialManager;
 use PayPal\Rest\ApiContext;
+use PHPUnit\Framework\TestCase;
 
 class Setup
 {
 
     public static $mode = 'mock';
 
-    public static function SetUpForFunctionalTests(\PHPUnit_Framework_TestCase &$test)
+    public static function SetUpForFunctionalTests(TestCase &$test)
     {
         $configs = array(
             'mode' => 'sandbox',
diff --git a/tests/PayPal/Test/Handler/OauthHandlerTest.php b/tests/PayPal/Test/Handler/OauthHandlerTest.php
index d4afc2f2..0649efb8 100644
--- a/tests/PayPal/Test/Handler/OauthHandlerTest.php
+++ b/tests/PayPal/Test/Handler/OauthHandlerTest.php
@@ -6,8 +6,9 @@
 use PayPal\Core\PayPalHttpConfig;
 use PayPal\Handler\OauthHandler;
 use PayPal\Rest\ApiContext;
+use PHPUnit\Framework\TestCase;
 
-class OauthHandlerTest extends \PHPUnit_Framework_TestCase
+class OauthHandlerTest extends TestCase
 {
 
     /**
diff --git a/tests/PayPal/Test/Rest/ApiContextTest.php b/tests/PayPal/Test/Rest/ApiContextTest.php
index 9869b9da..02b8e7de 100644
--- a/tests/PayPal/Test/Rest/ApiContextTest.php
+++ b/tests/PayPal/Test/Rest/ApiContextTest.php
@@ -1,12 +1,13 @@
 <?php
 
 use PayPal\Rest\ApiContext;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Test class for ApiContextTest.
  *
  */
-class ApiContextTest extends PHPUnit_Framework_TestCase
+class ApiContextTest extends TestCase
 {
 
     /**
diff --git a/tests/PayPal/Test/Validation/ArgumentValidatorTest.php b/tests/PayPal/Test/Validation/ArgumentValidatorTest.php
index 99214ab1..e90da5ab 100644
--- a/tests/PayPal/Test/Validation/ArgumentValidatorTest.php
+++ b/tests/PayPal/Test/Validation/ArgumentValidatorTest.php
@@ -2,8 +2,9 @@
 namespace PayPal\Test\Validation;
 
 use PayPal\Validation\ArgumentValidator;
+use PHPUnit\Framework\TestCase;
 
-class ArgumentValidatorTest extends \PHPUnit_Framework_TestCase
+class ArgumentValidatorTest extends TestCase
 {
 
     public static function positiveProvider()
diff --git a/tests/PayPal/Test/Validation/JsonValidatorTest.php b/tests/PayPal/Test/Validation/JsonValidatorTest.php
index 532a003a..f88f9646 100644
--- a/tests/PayPal/Test/Validation/JsonValidatorTest.php
+++ b/tests/PayPal/Test/Validation/JsonValidatorTest.php
@@ -2,8 +2,9 @@
 namespace PayPal\Test\Validation;
 
 use PayPal\Validation\JsonValidator;
+use PHPUnit\Framework\TestCase;
 
-class JsonValidatorTest extends \PHPUnit_Framework_TestCase
+class JsonValidatorTest extends TestCase
 {
 
     public static function positiveProvider()
diff --git a/tests/PayPal/Test/Validation/NumericValidatorTest.php b/tests/PayPal/Test/Validation/NumericValidatorTest.php
index b9aa2497..8ddbbb9c 100644
--- a/tests/PayPal/Test/Validation/NumericValidatorTest.php
+++ b/tests/PayPal/Test/Validation/NumericValidatorTest.php
@@ -2,8 +2,9 @@
 namespace PayPal\Test\Validation;
 
 use PayPal\Validation\NumericValidator;
+use PHPUnit\Framework\TestCase;
 
-class NumericValidatorTest extends \PHPUnit_Framework_TestCase
+class NumericValidatorTest extends TestCase
 {
 
     public static function positiveProvider()
diff --git a/tests/PayPal/Test/Validation/UrlValidatorTest.php b/tests/PayPal/Test/Validation/UrlValidatorTest.php
index 194b9dc7..cf06f634 100644
--- a/tests/PayPal/Test/Validation/UrlValidatorTest.php
+++ b/tests/PayPal/Test/Validation/UrlValidatorTest.php
@@ -2,8 +2,9 @@
 namespace PayPal\Test\Validation;
 
 use PayPal\Validation\UrlValidator;
+use PHPUnit\Framework\TestCase;
 
-class UrlValidatorTest extends \PHPUnit_Framework_TestCase
+class UrlValidatorTest extends TestCase
 {
 
     public static function positiveProvider()