如何修复Junit和Mockito中的“参数不同！”

Question

在执行涉及包含JUnit ()方法的方法的verify.save测试用例时，我得到以下错误‘参数是不同的！

@Test
public void checkCorrectAttemptTest() {
    Multiplication multiplication = new Multiplication(50, 60);
    User user = new User("abc");
    MultiplicationResultAttempt attempt = new MultiplicationResultAttempt(user, multiplication, 3000, false);
    MultiplicationResultAttempt verifiedAttempt = new MultiplicationResultAttempt(user, multiplication, 3000, true);
    when(userRepository.findByAlias("abc")).thenReturn(Optional.empty());
    boolean attemptResult = multiplicaitonServiceImpl.checkAttempt(attempt);
    assertThat(attemptResult).isTrue();

    verify(attemptRepository).save(verifiedAttempt);
}

我得到以下错误消息。

Argument(s) are different! Wanted:
attemptRepository.save(
    MultiplicationResultAttempt [user=User [alias=abc], multiplication=Multiplication [factorA=50, factorB=60], resultAttempt=3000, correct=true]
);
-> at microservices.book.multiplication.service.MultiplicationServiceImplTest.checkCorrectAttemptTest(MultiplicationServiceImplTest.java:60)
Actual invocation has different arguments:
attemptRepository.save(
    MultiplicationResultAttempt [user=User [alias=abc], multiplication=Multiplication [factorA=50, factorB=60], resultAttempt=3000, correct=true]
);
-> at microservices.book.multiplication.service.MultiplicationServiceImpl.checkAttempt(MultiplicationServiceImpl.java:58)
   at microservices.book.multiplication.service.MultiplicationServiceImplTest.checkCorrectAttemptTest(MultiplicationServiceImplTest.java:60)

Answer 1

你应该使用：

verify(attemptRepository).save(Matchers.refEq(verifiedAttempt));

我怀疑MultiplicationResultAttempt没有基于对象字段的相等实现等于，所以当Mockito验证属性时，它并不等于您提供的对象，尽管所有字段都具有相同的值。

Matcher.refEq(...)使用反射来确定值是否相同。

编辑

正如@farhanlq指出的那样，应该使用Matchers.refEq(..)代替ArgumentMatchers.refEq(...)。

Answer 2

我在MultiplicationResultAttempt中实现了等于和哈希码，而且它成功了！