Test coverage (#4280)

* Adding JUnit. Fixes #3874

* Adding JUnit. Fixes #3874.

* Adding Junit Fixes #3874.

* Adding copyright comment. Fixes #3874.

* Fixing Format and removing author name from new file. Fixes #3874

* Reformatting the code. Fixes #3874

* Fixing the code format. Fixes #3874.

* Adding JUnit. Fixes #3874.

* Fixing some error. Fixes #3874.

* Reformatting the file. Fixes #3874.

Co-authored-by: Jason Song <[email protected]>

apollo-common/src/test/java/com/ctrip/framework/apollo/common/utils/BeanUtilsTest.java

@@ -0,0 +1,126 @@
+/*
+ * Copyright 2022 Apollo Authors
+ *
+ * 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.ctrip.framework.apollo.common.utils;
+
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertNull;
+import java.util.ArrayList;
+import java.util.List;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.InjectMocks;
+import org.mockito.junit.MockitoJUnitRunner;
+import com.ctrip.framework.apollo.common.exception.BeanUtilsException;
+
+@RunWith(MockitoJUnitRunner.class)
+public class BeanUtilsTest {
+
+  @InjectMocks
+  private BeanUtils beanUtils;
+  List<Integer> someList;
+  List<KeyClass> someAnotherList;
+
+  @Before
+  public void setUp() {
+    someList = new ArrayList<>();
+    someAnotherList = new ArrayList<>();
+  }
+
+  @Test
+  public void testBatchTransformListNotEmpty() {
+    someList.add(77);
+    assertNotNull(BeanUtils.batchTransform(String.class, someList));
+  }
+
+  @Test
+  public void testBatchTransformListIsEmpty() {
+    assertNotNull(BeanUtils.batchTransform(String.class, someList));
+  }
+
+  @Test(expected = BeanUtilsException.class)
+  public void testBatchTransformBeanUtilsException() {
+    someList.add(77);
+    assertNotNull(BeanUtils.batchTransform(null, someList));
+  }
+
+  @Test
+  public void testBatchTransformSrcIsNull() {
+    someList.add(null);
+    assertNotNull(BeanUtils.batchTransform(String.class, someList));
+  }
+
+  @Test
+  public void testMapByKeyEmptyList() {
+    assertNotNull(BeanUtils.mapByKey(null, someList));
+  }
+
+  class KeyClass {
+    String keys;
+  }
+
+  @Test
+  public void testMapByKeyNotEmptyList() {
+    someAnotherList.add(new KeyClass());
+    assertNotNull(BeanUtils.mapByKey("keys", someAnotherList));
+  }
+
+  @Test(expected = BeanUtilsException.class)
+  public void testMapByKeyNotEmptyListThrowsEx() {
+    someAnotherList.add(new KeyClass());
+    assertNotNull(BeanUtils.mapByKey("wrongKey", someAnotherList));
+  }
+
+  @Test
+  public void testAggByKeyToListEmpty() {
+    assertNotNull(BeanUtils.aggByKeyToList("keys", someAnotherList));
+  }
+
+  @Test
+  public void testAggByKeyToListNotEmpty() {
+    someAnotherList.add(new KeyClass());
+    assertNotNull(BeanUtils.aggByKeyToList("keys", someAnotherList));
+  }
+
+  @Test(expected = BeanUtilsException.class)
+  public void testAggByKeyToListNotEmptyThrowsEx() {
+    someAnotherList.add(new KeyClass());
+    assertNotNull(BeanUtils.aggByKeyToList("wrongKey", someAnotherList));
+  }
+
+  @Test
+  public void testToPropertySetEmpty() {
+    assertNotNull(BeanUtils.toPropertySet("keys", someAnotherList));
+  }
+
+  @Test
+  public void testToPropertySetNotEmpty() {
+    someAnotherList.add(new KeyClass());
+    assertNotNull(BeanUtils.toPropertySet("keys", someAnotherList));
+  }
+
+  @Test(expected = BeanUtilsException.class)
+  public void testToPropertySetNotEmptyThrowsEx() {
+    someAnotherList.add(new KeyClass());
+    assertNotNull(BeanUtils.toPropertySet("wrongKey", someAnotherList));
+  }
+
+  @Test
+  public void testGetAndsetProperty() {
+    BeanUtils.setProperty(new KeyClass(), "keys", "value");
+    assertNull(BeanUtils.getProperty(new KeyClass(), "keys"));
+  }
+
+}