[英]Espresso pressBack() to check if back navigation works with Jetpack Navigation Component
I'm currently testing my navigation (Jetpack + Espresso).我目前正在测试我的导航(Jetpack + Espresso)。 I have 2 fragments:
我有2个片段:
I've already written the test to navigate from Fragment 1 to Fragment 2:我已经编写了从 Fragment 1 导航到 Fragment 2 的测试:
@Test
fun clickAddItemButton_navigateToAddItemFragment() {
val navController = mock(NavController::class.java)
launchFragmentInHiltContainer<ToDoListFragment> {
Navigation.setViewNavController(requireView(), navController)
}
onView(withId(R.id.fabAddItem)).perform(click())
verify(navController).navigate(
ToDoListFragmentDirections.actionToDoListFragmentToAddItemFragment()
)
}
How can I test the back navigation from Fragment2 to Fragment1?如何测试从 Fragment2 到 Fragment1 的返回导航? The test I have so far throws an exception:
到目前为止,我的测试抛出了一个异常:
@Test
fun pressBackButton_navigateToListFragment() {
val navController = Mockito.mock(NavController::class.java)
launchFragmentInHiltContainer<AddItemFragment> {
Navigation.setViewNavController(requireView(), navController)
}
// simulate back button press
pressBack()
// verify navigation to second fragment
Mockito.verify(navController).navigate(
AddItemFragmentDirections.actionAddItemFragmentToToDoListFragment()
)
}
Exception:例外:
androidx.test.espresso.NoActivityResumedException: Pressed back and killed the app
at dalvik.system.VMStack.getThreadStackTrace(Native Method)
at java.lang.Thread.getStackTrace(Thread.java:1538)
at androidx.test.espresso.base.DefaultFailureHandler.getUserFriendlyError(DefaultFailureHandler.java:96)
at androidx.test.espresso.base.DefaultFailureHandler.handle(DefaultFailureHandler.java:59)
at androidx.test.espresso.ViewInteraction.waitForAndHandleInteractionResults(ViewInteraction.java:322)
at androidx.test.espresso.ViewInteraction.desugaredPerform(ViewInteraction.java:178)
at androidx.test.espresso.ViewInteraction.perform(ViewInteraction.java:119)
at androidx.test.espresso.Espresso.pressBack(Espresso.java:229)
As per your failed test, you simply pressing back from AddItemFragment which is only fragment in your container.根据您失败的测试,您只需从AddItemFragment回退,它只是容器中的片段。 That is reason its failing.
这就是它失败的原因。 To make it properly work, first launch ToDoListFragment , navigate to AddItemFragment then pressback() to verify you moved to listfragment.
为了使其正常工作,首先启动ToDoListFragment ,导航到 AddItemFragment 然后按回()以验证您已移动到列表片段。 Basically code in clickAddItemButton_navigateToAddItemFragment need to placed first in second test.
基本上clickAddItemButton_navigateToAddItemFragment 中的代码需要首先放在第二个测试中。
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