Mockito基本教程

import static org.junit.Assert.assertEquals;import static org.mockito.Mockito.atLeast;import static org.mockito.Mockito.atLeastOnce;import static org.mockito.Mockito.doThrow;import static org.mockito.Mockito.inOrder;import static org.mockito.Mockito.mock;import static org.mockito.Mockito.never;import static org.mockito.Mockito.only;import static org.mockito.Mockito.timeout;import static org.mockito.Mockito.times;import static org.mockito.Mockito.verify;import static org.mockito.Mockito.verifyNoMoreInteractions;import static org.mockito.Mockito.when;import java.util.Iterator;import java.util.List;import org.junit.Test;import org.mockito.InOrder;public class Test1{@Testpublic void testThenReturn(){//create mock objectUser u = mock(User.class);//when call method getUsername then return "hello" instead, the method is not called, that is so-called mockingwhen(u.getUsername()).thenReturn("user1");u.getUsername();System.out.println(u.getUsername());}@Testpublic void testThenReturn2(){//create mock objectUser u = mock(User.class);//first call will return "user1", second call will return "user2"when(u.getUsername()).thenReturn("user1").thenReturn("user2");System.out.println(u.getUsername());System.out.println(u.getUsername());System.out.println(u.getUsername());//create mock objectList<String> mockList = mock(List.class);//for input parameter 0 method get will return "one"when(mockList.get(0)).thenReturn("one");//for input parameter 1 method get will return "two"when(mockList.get(1)).thenReturn("two");        System.out.println(mockList.get(0));System.out.println(mockList.get(1));}@Testpublic void testThenReturn4(){//create mock objectUser u = mock(User.class);//first call will return "user1", second call will return "user2"when(u.getUsername()).thenReturn("user1").thenReturn("user2");System.out.println(u.getUsername());System.out.println(u.getUsername());}@Testpublic void testAssertEquals(){User u1 = new User();u1.setBirthday("1992-08-02");assertEquals(22, u1.getAge());User u2 = mock(User.class);when(u2.getAge()).thenReturn(22);assertEquals(22, u2.getAge());}@Test    public void verifyMethodCalledTimes() {  //create mock objectList<String> mockList = mock(List.class);        mockList.get(0);          mockList.get(2);          mockList.get(2);          mockList.get(2);                    //verify how many times a method is called for special arguments        verify(mockList, atLeastOnce()).get(0);          verify(mockList, never()).get(1);          verify(mockList, times(3)).get(2);        verify(mockList, atLeast(2)).get(2);      } @Testpublic void verifyInOrder(){//Single mock whose methods must be invoked in a particular orderList<String> singleMock = mock(List.class);//using a single mocksingleMock.add("was added firstly");singleMock.add("was added secondly"); //create an inOrder verifier for a single mockInOrder inOrder = inOrder(singleMock); //following will make sure that add is first called with "was added first, then with "was added second"inOrder.verify(singleMock).add("was added firstly");inOrder.verify(singleMock).add("was added secondly"); //Multiple mocks that must be used in a particular orderList<String> firstMock = mock(List.class);List<String> secondMock = mock(List.class); //using mocksfirstMock.add("was called firstly");secondMock.add("was called secondly"); //create inOrder object passing any mocks that need to be verified in orderInOrder inOrder2 = inOrder(firstMock, secondMock); //following will make sure that firstMock was called before secondMockinOrder2.verify(firstMock).add("was called firstly");inOrder2.verify(secondMock).add("was called secondly");}@Testpublic void testThrowException(){User u = mock(User.class);doThrow(new RuntimeException()).when(u).setUsername("user1"); //calling setUserName() throws RuntimeException:u.setUsername("user1");}@Testpublic void verifyRedundentCall(){User u = mock(User.class);u.setUsername("user1");//u.setUsername("user2"); //verify(mock, times(1));//verify(u).setUsername("user1"); //following verification will failverifyNoMoreInteractions(u);}@Testpublic void checkOnly(){User u = mock(User.class);u.setUsername("user1");//check if a method is the only one be calledverify(u, only()).setUsername("user1");//above is a shorthand for following 2 lines of code:verify(u).setUsername("user1");verifyNoMoreInteractions(u);}public static void verifyTimeout(){User u = mock(User.class);//validation passes when method is called within given timeverify(u, timeout(2000)).getUsername();u.getUsername();}@Testpublic void testIterator(){Iterator<String> i = mock(Iterator.class);        when(i.next()).thenReturn("Hello" ).thenReturn("World");          String result = i.next() + " " + i.next();                  verify(i, times(2)).next();          assertEquals("Hello World" , result);  }}