Add example test for UrlFetch

unittests/pom.xml

@@ -22,6 +22,7 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <maven-war-plugin-version>3.0.0</maven-war-plugin-version>
         <maven-compiler-plugin-version>2.5.1</maven-compiler-plugin-version>
+        <google-api-client.version>1.22.0</google-api-client.version>
     </properties>
 
     <dependencies>
@@ -66,6 +67,12 @@
             <version>${appengine.sdk.version}</version>
             <scope>test</scope>
         </dependency>
+        <dependency>
+          <groupId>com.google.api-client</groupId>
+          <artifactId>google-api-client-appengine</artifactId>
+          <version>${google-api-client.version}</version>
+          <scope>test</scope>
+        </dependency>
     </dependencies>
 
     <build>

unittests/src/test/java/com/google/appengine/samples/LocalUrlFetchTest.java

@@ -0,0 +1,77 @@
+/*
+ * Copyright 2016 Google Inc. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.appengine.samples;
+
+import static org.junit.Assert.assertEquals;
+
+import com.google.appengine.tools.development.testing.LocalServiceTestHelper;
+import com.google.appengine.tools.development.testing.LocalURLFetchServiceTestConfig;
+import com.google.api.client.http.LowLevelHttpRequest;
+import com.google.api.client.http.LowLevelHttpResponse;
+import com.google.api.client.testing.http.MockHttpTransport;
+import com.google.api.client.testing.http.MockLowLevelHttpRequest;
+import com.google.api.client.testing.http.MockLowLevelHttpResponse;
+
+import java.io.IOException;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import com.google.api.client.http.HttpRequestFactory;
+import com.google.api.client.http.GenericUrl;
+import com.google.api.client.http.HttpResponse;
+
+public class LocalUrlFetchTest {
+  private final LocalServiceTestHelper helper =
+      new LocalServiceTestHelper(new LocalURLFetchServiceTestConfig());
+
+  @Before
+  public void setUp() {
+    helper.setUp();
+  }
+
+  @After
+  public void tearDown() {
+    helper.tearDown();
+  }
+
+  @Test
+  public void testMockUrlFetch() throws IOException {
+    // See http://g.co/dv/api-client-library/java/google-http-java-client/unit-testing
+    MockHttpTransport mockHttpTransport = new MockHttpTransport() {
+      @Override
+      public LowLevelHttpRequest buildRequest(String method, String url) throws IOException {
+        assertEquals(method, "GET");
+        assertEquals(url, "http://foo.bar");
+
+        return new MockLowLevelHttpRequest() {
+          @Override
+          public LowLevelHttpResponse execute() throws IOException {
+            MockLowLevelHttpResponse response = new MockLowLevelHttpResponse();
+            response.setStatusCode(234);
+            return response;
+          }
+        };
+      }
+    };
+
+    HttpRequestFactory requestFactory = mockHttpTransport.createRequestFactory();
+    HttpResponse response = requestFactory.buildGetRequest(new GenericUrl("http://foo.bar"))
+        .execute();
+    assertEquals(response.getStatusCode(), 234);
+  }
+}