在Android单元测试中模拟挂起的函数调用

如何解决在Android单元测试中模拟挂起的函数调用

我有一个要测试的函数withCredentials，该函数用于传递使用用户凭据进行API调用所需的必需参数，它看起来像这样：

@VisibleForTesting(otherwise = VisibleForTesting.PRIVATE)
internal suspend fun <T> withCredentials(block: suspend (String) -> Response<T>): ServiceResponse<T> 

它的责任是填写身份验证载体（传递的块中的字符串）进行api调用，并生成ServiceResponse对象（基本上是与实际响应合并的响应对象）并返回结果，从不抛出例外

它被这样称呼：

val response = withCredentials{ bearer ->  service.logIn(bearer,userName,password) }

我希望测试withCredentials方法而无需测试特定方案（例如，在登录过程中会调用上面的情况）

我目前正在做的事情是这样的：

fun `test with credentials is calls nothing when there are no credentials saved`() {
    runBlocking {
        whenever(prefs.auth).thenReturn(null)
        
        val response = withCredentials(this@CoreTests::testSuccess)

        assertEquals(0,called)

    }
}


private var called = 0
private suspend fun testSuccess(bearer: String?): Response<String> {
        delay(1)
        called++
        return Response.success(200,"$bearer test")
    }

为了验证（在此示例中）在没有保存凭据的情况下永远不会调用testSuccess

有没有一种方法可以模拟暂停功能，所以我可以做这样的事情：

private val functionCall = mock(suspend (String?)-> ServiceResponse<String>) //this is ofc incorrect I need the correct code here

fun `test with credentials is calls nothing when there are no credentials saved`() {
    runBlocking {
        whenever(prefs.auth).thenReturn(null)
        
        val response = withCredentials(this@CoreTests::testSuccess)

        verify(functionCall,never()).invoke(any())

    }
}