mock2.java

public class BlogServiceTest {

    @Mock
    private AuthClient authClient; // mock 객체생성

    @Mock
    private BlogRepository blogRepository; // mock 객체생성

    @Test
    public void addPost() {
        // given
        given(authClient.verifyToken(anyString())).willReturn(1L);
        given(blogRepository.save(any())).willThrow(new Post(1L, "test"));
        BlogService service = new BlogService(authClient, blogRepository);
        String token = "testToken";
        Post post = new Post("test");

        // when
        service.addPost(new AddPostRequest(token, post));

        // then
        verify(authClient).should().verifyToken(anyString()); // 행위검증
        verify(blogRepository).should().save(any()); // 행위검증
    }

    @Test
    public void addPost_thrownByAuthClient() {
        // given
        given(authClient.verifyToken(any())).willThrow(new RuntimeException());
        BlogService service = new BlogService(authClient, blogRepository);
        String token = "testToken";
        Post post = new Post("test");

        // when
        assertThrows(RuntimeException.class, () -> {
            service.addPost(new AddPostRequest(token, post));
        });

        // then
        verify(authClient).should().verifyToken(any()); // 행위검증
        verifyZeroInteractions(blogRepository);
    }
}