导航组件 - 模仿Navcontroller图形

Question

我正在使用导航组件，我试图测试我的 Fragment 与工具测试。该片段有一个自定义工具栏，初始化为 onViewCreated 方法的扩展函数。

override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    super.onViewCreated(view, savedInstanceState)
    tbBlack.init()
}


fun androidx.appcompat.widget.Toolbar.init(
    menuId: Int? = null
) {
    title = ""
    menuId?.let {
        inflateMenu(it)
    }

    findNavController().let {
        it.graph.let { graph ->
            val configuration = AppBarConfiguration(graph)
            setupWithNavController(it, configuration)
        }
    }
}

在我的仪器测试中，在初始化场景的过程中，由于一个叫 "D "的方法，测试崩溃了。null 导航控制器上的图形。

在测试中模拟了导航控制器，也模拟了下面这样的图形。

@RunWith(AndroidJUnit4::class)
class LoginFragmentTest {
    @Test
    fun testEmptyFields() {
        val mockNavController = mock(NavController::class.java)
        val mockGraph = mock(NavGraph::class.java)
        mockNavController.graph = mockGraph

        val scenario = launchFragmentInContainer(themeResId = R.style.AppTheme) {
            LoginFragment().also { fragment ->
                // In addition to returning a new instance of our Fragment,
                // get a callback whenever the fragment’s view is created
                // or destroyed so that we can set the mock NavController
                fragment.viewLifecycleOwnerLiveData.observeForever { viewLifecycleOwner ->
                    if (viewLifecycleOwner != null) {
                        // The fragment’s view has just been created
                        Navigation.setViewNavController(fragment.requireView(), mockNavController)
                    }
                }

            }
        }

        scenario.onFragment {
            it.run {
                val viewsIds =
                    listOf(R.id.etEmailAddress, R.id.etPassword)

                for (viewId in viewsIds) {
                    onView(ViewMatchers.withId(viewId))
                        .perform(ViewActions.replaceText(""))
                    Thread.sleep(500)
                    onView(ViewMatchers.withId(R.id.btLogin)).check(
                        ViewAssertions.matches(
                            CoreMatchers.not(
                                ViewMatchers.isEnabled()
                            )
                        )
                    )
                }
            }
        }
    }
}

我在模拟navController的过程中是否遗漏了什么？

Answer 1

我通过使用新的 TestNavHostController 由 androidx导航测试库

基本上，这样做。

1. 在你的（应用）gradle中导入依赖关系。

dependencies {
  def nav_version = "2.3.0-alpha06"

  androidTestImplementation "androidx.navigation:navigation-testing:$nav_version"
}

2. 用以下方法模拟你的导航控制器 TestNavHostController 在你的androidTest中。

 // Create a TestNavHostController
val navController = TestNavHostController(
            ApplicationProvider.getApplicationContext())

val fragmentArgs = Bundle().apply {
            putParcelable(Constants.RETAIL_CLICK_SOURCE_ID, RetailDetailsClicked.Source.LIST)
            putParcelable(Constants.RETAIL_ID, retail)
        }
        navController.setGraph(R.navigation.retail_details_graph)

        launchFragmentInContainer(
            fragmentArgs, R.style.AppTheme
        ) {
            RetailDetailsFragment().also { fragment ->
                // In addition to returning a new instance of our Fragment,
                // get a callback whenever the fragment’s view is created
                // or destroyed so that we can set the mock NavController
                fragment.viewLifecycleOwnerLiveData.observeForever { viewLifecycleOwner ->
                    if (viewLifecycleOwner != null) {
                        // The fragment’s view has just been created
                        Navigation.setViewNavController(fragment.requireView(), navController)
                    }
                }
            }
        }

就是这样！