Mockito 学习篇（三）

Mockito学习篇目录：

Mockito 学习篇（一）

Mockito 学习篇（二）

Mockito 学习篇（三）

Mockito 学习篇（四）完结

import org.junit.Assert;import org.junit.Test;import org.junit.runner.RunWith;import org.mockito.Mock;import org.mockito.Mockito;import org.mockito.Spy;import org.mockito.runners.MockitoJUnitRunner;import java.util.ArrayList;import java.util.HashSet;import java.util.LinkedList;import static org.mockito.AdditionalAnswers.delegatesTo;import static org.mockito.Mockito.doReturn;import static org.mockito.Mockito.mock;/** * MockitoTester. * * @author zxb * @version 1.0 * @since <pre>08/29/2017</pre> */@RunWith(MockitoJUnitRunner.class)public class MockitoTest3 {    @Mock    private LinkedList linkedList;    @Spy    private ArrayList arrayList;    final class DontYouDareToMockMe extends ArrayList {    }    @Test    public void test() throws InterruptedException {        //区别一个对象是模拟对象还是侦查对象        Assert.assertTrue(Mockito.mockingDetails(linkedList).isMock());        Assert.assertTrue(Mockito.mockingDetails(arrayList).isSpy());        //模拟对象不一定是侦查对象        Assert.assertFalse(Mockito.mockingDetails(linkedList).isSpy());        //侦查对象是模拟对象的一种类型        Assert.assertTrue(Mockito.mockingDetails(arrayList).isMock());        //委托调用真实实例（doCallRealMethod），用在以下几种场景：        //Final classes but with an interface，有接口（有继承应该也行）的final类        //Already custom proxied object ，已经自定义代理的对象        //Special objects with a finalize method, i.e. to avoid executing it 2 times，final方法        DontYouDareToMockMe dontYouDareToMockMe = new DontYouDareToMockMe();        dontYouDareToMockMe.add(new HashSet());        ArrayList listWithDelegate = mock(ArrayList.class, delegatesTo(dontYouDareToMockMe));        Assert.assertEquals("mock对象的size不为1", 1, listWithDelegate.size());        listWithDelegate.clear();        //委托调用了真实方法，所以真实对象的size也为空了。        Assert.assertEquals("dontYouDareToMockMe的size不为0", 0, dontYouDareToMockMe.size());        //因为是调用真实对象的方法，所以当索引不存在时，不能直接用when..thenReturn方法        //when(listWithDelegate.get(0)).thenReturn("foo");        doReturn("foo").when(listWithDelegate).get(0);        Assert.assertEquals("foo", listWithDelegate.get(0));     //比如对String类mock     String str = "vvv";     CharSequence mock = mock(CharSequence.class, delegatesTo(str));     System.out.println(mock);     Assert.assertThat(mock.toString(), new Equals("vvv"));    }}