我如何模拟 java.time.LocalDate.now() [英] How can I mock java.time.LocalDate.now()

问题描述

在我的测试用例中，我需要测试时间敏感的方法，在该方法中我们使用的是 java 8 类 LocalDate，它不是 Joda.

In my test case, I need test time sensitive method, in that method we're using java 8 class LocalDate, it is not Joda.

我可以做些什么来改变时间，当我运行测试时

What can I do to change time, when I'm running test

推荐答案

在您的代码中，将 LocalDate.now() 替换为 LocalDate.now(clock);.

In your code, replace LocalDate.now() with LocalDate.now(clock);.

然后您可以传递 Clock.systemDefaultZone() 用于生产和 一个固定时钟用于测试.

You can then pass Clock.systemDefaultZone() for production and a fixed clock for testing.

这是一个例子:

首先，注入Clock.如果您使用的是弹簧靴，只需执行以下操作:

First, inject the Clock. If you are using spring boot just do a :

@Bean
public Clock clock() {
    return Clock.systemDefaultZone();
}

其次，在您的代码中调用 LocalDate.now(clock) :

Second, call LocalDate.now(clock) in your code :

@Component
public class SomeClass{

    @Autowired
    private Clock clock;

    public LocalDate someMethod(){
         return LocalDate.now(clock);
    }
}

现在，在您的单元测试类中:

Now, inside your unit test class :

// Some fixed date to make your tests
private final static LocalDate LOCAL_DATE = LocalDate.of(1989, 01, 13);

// mock your tested class
@InjectMocks
private SomeClass someClass;

//Mock your clock bean
@Mock
private Clock clock;

//field that will contain the fixed clock
private Clock fixedClock;


@Before
public void initMocks() {
    MockitoAnnotations.initMocks(this);

    //tell your tests to return the specified LOCAL_DATE when calling LocalDate.now(clock)
    fixedClock = Clock.fixed(LOCAL_DATE.atStartOfDay(ZoneId.systemDefault()).toInstant(), ZoneId.systemDefault());
    doReturn(fixedClock.instant()).when(clock).instant();
    doReturn(fixedClock.getZone()).when(clock).getZone();
}

@Test
public void testSomeMethod(){
    // call the method to test
    LocalDate returnedLocalDate = someClass.someMethod();

    //assert
    assertEquals(LOCAL_DATE, returnedLocalDate);
}

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