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Mockito|Mockito mock void methods Example
@RunWith(MockitoJUnitRunner.class)
public class StubbingTest {@Mock
privateList list;
@Before
public void init() {
list = mock(ArrayList.class);
}@Test
public void howToUseStubbing() {
when(list.get(0)).thenReturn("first");
assertThat(list.get(0), equalTo("first"));
when(list.get(anyInt())).thenThrow(new RuntimeException());
try {
list.get(0);
fail();
} catch (Exception e) {
assertThat(e, instanceOf(RuntimeException.class));
}
}@Test
public void howToStubbingVoidMethod() {
doNothing().when(list).clear();
doThrow(RuntimeException.class).when(list).clear();
try {
list.clear();
fail();
} catch (Exception e) {
assertThat(e, instanceOf(RuntimeException.class));
}
}@Test
public void stubbingReturn() {
when(list.get(0)).thenReturn("first");
doReturn("second").when(list).get(1);
assertThat(list.get(0), equalTo("first"));
assertThat(list.get(1), equalTo("second"));
}@Test
public void stubbingWithAnswer() {
when(list.get(anyInt())).thenAnswer(invocationOnMock -> {
Integer index = invocationOnMock.getArgument(0, Integer.class);
return String.valueOf(index * 10);
});
assertThat(list.get(0), equalTo("0"));
assertThat(list.get(10), equalTo("100"));
assertThat(list.get(999), equalTo("9990"));
}@Test
public void iterateSubbing() {
when(list.size()).thenReturn(1, 2, 3, 4, 5);
assertThat(list.size(), equalTo(1));
assertThat(list.size(), equalTo(2));
assertThat(list.size(), equalTo(3));
assertThat(list.size(), equalTo(4));
assertThat(list.size(), equalTo(5));
assertThat(list.size(), equalTo(5));
}@Test
public void stubbingServiceTest() {
StubbingService stubbingService = mock(StubbingService.class);
System.out.println(stubbingService.getClass());
stubbingService.gets();
}@After
public void destroy() {
reset(this.list);
}}
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