Testing with Mockito

1) Register MockitoExtension

@ExtendWith(MockitoExtension.class)
class ObjectTest {
    static final Long ID = 1L;

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2) Create the mock

    @Mock
    private ObjectRepo mockRepo;

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3) Inject the mock

    @InjectMocks
    private ObjectService objectService;

    @Test
    void whenfindByIdThenReturnResult() {
        var objectDAO = new ObjectDAO();
        objectDAO.setId(ID);

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4) Define the behavior

        when(mockRepo.findById(any(Long.class))).thenReturn(Optional.of(objectDAO));

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5) Test

        var result = ObjectService.findById(ID);

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6) Verify

        verify(mockRepo, times(1)).findById(any(Long.class));

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7) Validate

        assertAll(
                () -> assertNotNull(result),
                () -> assertEquals(objectDAO.getId(), result.getId())
        );
    }
}

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原文链接：Testing with Mockito