java - 模拟 spring 方法注释在测试用例中抛出 NullPointerException

Question

我在 spring 项目中有一个自定义验证注解。

注释的目的是接受应该是 id 和 dept 值的参数名称。

切面的目的是从注解中获取paramNames，在方法签名中找到相应的参数位置，从识别到的位置获取值并使用值进行验证。

这是我到目前为止编写的类。

@Target({ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Component
public @interface ValidateDeptAnnotation {
    String id();
    String dept();
}

注释方法时执行验证的方面。

@Aspect
@Component
public class ValidateDeptAspect {

    @Before("@annotation(<package>.ValidateDeptAnnotation)")
    public void runValidation(JoinPoint joinPoint) throws MemberIdentityException {
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        Method method = signature.getMethod();
        ValidateDeptAnnotation annotation = method.getAnnotation(ValidateDeptAnnotation.class); 
        String id = null;
        String dept = null;
        for (int index = 0; index < signature.getParameterNames().length; index++) {
            String paramterName = signature.getParameterNames()[index];
            if (annotation.dept().equals(paramterName)) {
                dept = joinPoint.getArgs()[index].toString();
            } else if (annotation.id().equals(paramterName)) {
                id = joinPoint.getArgs()[index].toString();
            }
        }
        //....further processing...throw appropriate error msgs logic
    }

}

测试类

@RunWith(PowerMockRunner.class)
@PrepareOnlyThisForTest({Method.class})
public class ValidateDeptAspectTestMockedMethod {
    @InjectMocks
    private ValidateDeptAspect validationAspect;
    @Mock
    private JoinPoint joinPoint;

    @Mock
    private MethodSignature methodSignature;
    @Before
    public void setUp() {
        MockitoAnnotations.initMocks(this);
    }
    @Test
    public void testIdParamNotFound() {
        String[] methodSignatureParams = {"id","dept"};
        String[] argumentValues= {"789","dept-789-pacman"};

        Mockito.doReturn(methodSignature).when(joinPoint).getSignature();
        Mockito.doReturn(methodSignatureParams).when(methodSignature).getParameterNames();
        Mockito.doReturn(argumentValues).when(joinPoint).getArgs();
        ValidateDeptAnnotation annotation = Mockito.mock(ValidateDeptAnnotation.class);

        Method mockedMethod = PowerMockito.mock(Method.class);
        Mockito.doReturn(mockedMethod).when(methodSignature).getMethod();
        PowerMockito.doReturn(annotation).when(mockedMethod).getAnnotation(Mockito.any());
        //        PowerMockito.when(mockedMethod.getAnnotation(ValidateDept.class)).thenReturn(annotation); --didnot work, same error.
        Mockito.doReturn("iiiiid").when(annotation).id();
        Mockito.doReturn("dept").when(annotation).dept();

        validationAspect.runValidation(joinPoint);


        ///...further assertion logic to check for error message as iiiid != id
        //but never gets here.

   }
}

当我运行测试用例时，它失败并在方面中的行出现 NullPointerException。

if (annotation.dept().equals(paramterName))  

我调试测试用例的时候，这里的注解是正确获取的。

PowerMockito.doReturn(annotation).when(mockedMethod).getAnnotation(Mockito.any());

但是，对切面方法的调用会抛出 NPE。任何帮助深表感谢。

提前致谢。

Answer 1

对于那些徘徊在这种情况下的人。我还没有想出如何解决问题或问题是什么。

我目前已经接受了这种方法 - 在测试用例中创建虚拟方法来反射(reflect)您的测试用例并正常处理测试用例。

代码:

@RunWith(MockitoJUnitRunner.class)
public class ValidateDeptAspectTestMockedMethod {

    @InjectMocks
    private ValidateDeptAspect validationAspect;
    @Mock
    private JoinPoint joinPoint;

    @Mock
    private MethodSignature methodSignature;
    @Before
    public void setUp() {
        MockitoAnnotations.initMocks(this);
    }
    @Test
    public void testIdParamNotFound() {
        String[] methodSignatureParams = {"id","dept"};
        String[] argumentValues= {"789","dept-789-pacman"};

        Mockito.doReturn(methodSignature).when(joinPoint).getSignature();
        Mockito.doReturn(methodSignatureParams).when(methodSignature).getParameterNames();
        Mockito.doReturn(argumentValues).when(joinPoint).getArgs();

        Method method = myMethod("noMemberId");
        Mockito.doReturn(method).when(methodSignature).getMethod();

        validationAspect.runValidation(joinPoint);


        ///...further assertion logic to check for error message
        // The test is successful.
    }

    @ValidateDeptAnnotation(memberId = "",accessToken = "accessToken")
    private void noMemberId(String memberId, String accessToken) {}
}