[FIXED] Mock JWT Utils to validate Token

Issue

I want to create JUnkt test for this endpoint:

    @Autowired
    private JwtTokenProvider jwtTokenProvider;

    @PostMapping("reset_token")
    public ResponseEntity<?> resetToken(@Valid @RequestBody ResetPasswordTokenDTO resetPasswordTokenDTO, BindingResult bindResult) {

        final String login = jwtTokenProvider.getUsername(resetPasswordTokenDTO.getResetPasswordToken());
    }

Full code: Github

JUnit test:

@Test
public void resetTokenTest_NOT_FOUND() throws Exception {
    when(usersService.findByResetPasswordToken(anyString())).thenReturn(Optional.empty());

    mockMvc.perform(post("/users/reset_token")
            .contentType(MediaType.APPLICATION_JSON)
            .content(ResetPasswordTokenDTO))
            .andExpect(status().isNotFound());
}

I get NPE at this line when I run the code:

final String login = jwtTokenProvider.getUsername(resetPasswordTokenDTO.getResetPasswordToken());

How I can mock jwtTokenProvider properly? As you can see I have a file with test data which I load but the token is not extracted. Do you know how I can fix this issue?

Solution

The most straightforward way is to use Mockito and create mock instances and pass it directly to your controller class using constructor injection.

However, if you do not wish to use constructor injection (I recommend you to use it though, as it is much more explicit) you need to define your beans in a separate test configuration class

@Profile("test")
@Configuration

public class TestConfiguration {
    @Bean
    public JwtTokenProvider mockJwtTokenProvider() {
        return Mockito.mock(JwtTokenProvider.class);
    }

}

Also, add the correct profile to your test class by @ActiveProfiles("test")

Answered By - recrsn
Answer Checked By - Mary Flores (JavaFixing Volunteer)