在协程上下文中运行模拟方法在kotlin中返回null

Question

我想模拟服务的方法，但是在不同的上下文中调用此方法，并且返回值为null（dp.search是挂起函数）。看一下我的代码：

    @Test
    fun `testing mocked method in coroutine`() = testScope.runBlockingTest {
        val dp = Mockito.mock(DataProvider::class.java)
        Mockito.`when`(dp.search("Any")).thenReturn(listOf())

        val data = withContext(Dispatchers.Unconfined) { dp.search("Any")}
        // but data is null
        Assert.assertEquals(0, data.size)

    }

试图检查类似以下两种情况：

首先不使用调度程序！只是调用暂停功能

    @Test
    fun `testing mocked method in coroutine`() = testScope.runBlockingTest {
        val dp = Mockito.mock(DataProvider::class.java)
        Mockito.`when`(dp.search("Any")).thenReturn(listOf())

        val data =  dp.search("Any")
        // but data is correct
        Assert.assertEquals(0, data.size)

    }

比在定义好的上下文中进行嘲笑更好。 （但这不是解决方案。仅用于检查模拟是否有效）

    @Test
    fun `testing mocked method in coroutine`() = testScope.runBlockingTest {
        val dp = Mockito.mock(DataProvider::class.java)


        val data = withContext(Dispatchers.Unconfined) { 
                Mockito.`when`(dp.search("Any")).thenReturn(listOf())
                dp.search("Any")
        }
        //data is correct but this is not a solution for me. search is called in another class
        Assert.assertEquals(0, data.size)

    }

我应该说这样的设置：

 @ExperimentalCoroutinesApi
    val testDispatcher = TestCoroutineDispatcher()
    val testScope = TestCoroutineScope(testDispatcher)

  @ExperimentalCoroutinesApi
    @Before
    fun initialize() {
        Dispatchers.setMain(testDispatcher)
        MockitoAnnotations.initMocks(this)
    }

    @ExperimentalCoroutinesApi
    @After
    fun tearDown() {
        Dispatchers.resetMain()
        testScope.cleanupTestCoroutines()

    }