[Mockito] Mock List interface

In this post, we are going to see more functionalities in Mockito.

Mock a List interface:

    @Test

    public void testZie_returnOnce() {

        List listMock = mock(List.class);

        when(listMock.size()).thenReturn(10);

        assertEquals(10, listMock.size());

    }

Call multi times:

    @Test

    public void testZie_returnMultis() {

        List listMock = mock(List.class);

        when(listMock.size()).thenReturn(10).thenReturn(20);

        assertEquals(10, listMock.size());

        assertEquals(20, listMock.size());

    }

First call, return 10, second times return 20.

Mock, List.get():

    @Test

    public void testZie_returnGet() {

        List listMock = mock(List.class);

        when(listMock.get(0)).thenReturn("Good");

        assertEquals("Good", listMock.get(0));

        assertEquals(null, listMock.get(1));

    }

Mockito.anyInt():

    @Test

    public void testZie_returnGetAny() {

        List listMock = mock(List.class);

        when(listMock.get(Mockito.anyInt())).thenReturn("Good");

        assertEquals("Good", listMock.get(0));

        assertEquals("Good", listMock.get(1));

    }