java - Mockito findByIdOrNull 问题

Question

我有一个这样的测试:

    @Test
    fun `can execute`() {
        whenever(countryRepository.findByIdOrNull("DE")).thenReturn(germany)
        underTest.execute()
    }

此测试失败并显示以下错误消息:

org.mockito.exceptions.misusing.WrongTypeOfReturnValue: 
Country cannot be returned by findById()
findById() should return Optional
***
If you're unsure why you're getting above error read on.
Due to the nature of the syntax above problem might occur because:
1. This exception *might* occur in wrongly written multi-threaded tests.
   Please refer to Mockito FAQ on limitations of concurrency testing.
2. A spy is stubbed using when(spy.foo()).then() syntax. It is safer to stub spies - 
   - with doReturn|Throw() family of methods. More in javadocs for Mockito.spy() method.

很确定这可能是 Mockito 的问题，因为我没有使用 findbyId但使用 findByIdOrNull因为这更适合 kotlin。我不想更改代码来修复测试。

你能帮我解决这个问题或解决这个问题吗？

Answer 1

显然:

Mockito doesn't support the mocking of static methods, at least not in the near future. https://github.com/mockito/mockito/issues/1481

所以 extension code实际上是被执行而不是被 mock 。

一种解决方案可能是让代码执行而不是模拟 findByIdOrNull只是模拟底层 findById (返回一个可选的)。

编辑

..或使用 MockK正如链接所暗示的那样!