如何修复Junit和Mockito中的'Argument(s) are different! Wanted'错误

Question

在执行涉及包含verify.save((方法的方法的JUnit测试用例时，我收到以下错误"参数不同！通缉令'

@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);
}

我收到以下错误消息。

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不会在对象的字段上实现基于相等的等于，因此当 Mockito 验证属性时，它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Matchers.refEq(..)已弃用，应该改用ArgumentMatchers.refEq(...)。

Answer 2

我确实在MultiplicationResultAttempt中实现了等于和哈希代码，并且它起作用了!!