对LiveData postValue执行Mockito verify()失败

clickRepo 测试 here

错误:

Wanted but not invoked:
navController.navigate(
app.ui.login.LoginFragmentDirections$ShowSelectMerchant@377f3c27
);

LoginFragmentTest.kt

@Test
fun success(){
    val user = TestUtil.createUser(email)

    userData.postValue(Resource.success(user))

    System.out.println("Test NavController Hash: " + testFragment.navController.hashCode())
            verify(testFragment.navController).navigate(LoginFragmentDirections.showSelectMerchant().matcher())

}

override fun openSelectMerchantFragment() {
    System.out.println("Real NavController Hash: " + navController().hashCode())
    navController().navigate(LoginFragmentDirections.showSelectMerchant())
}

openSelectMerchantFragment 在将成功的资源发布到live userData时调用。考试不及格有明显的原因吗?

我可以看到测试片段的mock nav controller和片段中被调用的nav controller具有相同的hash值,因此我非常确定我如何模拟activity、fragment或nav controller没有问题。我还可以很明显地看到,navigate()函数确实被调用了。