espresso：断言对话框未显示

Question

如何断言没有显示对话框？

目前我有一个测试，它检查对话框中是否不存在文本

onView(withText("Mobile connection")).inRoot(isDialog()).check(doesNotExist());

但我得到一个 NoMatchingRootException

android.support.test.espresso.NoMatchingRootException: Matcher 'is dialog' did not match any of the following roots: [Root{application-window-token=android.view.ViewRootImpl$W@9acefba, window-token=android.view.ViewRootImpl$W@9acefba, has-window-focus=true, layout-params-type=1, layout-params-string=WM.LayoutParams{(0,0)(fillxfill) ty=1 fl=#81810100 wanim=0x1030465 needsMenuKey=2}, decor-view-string=DecorView{id=-1, visibility=VISIBLE, width=768, height=1280, has-focus=true, has-focusable=true, has-window-focus=true, is-clickable=false, is-enabled=true, is-focused=false, is-focusable=false, is-layout-requested=false, is-selected=false, root-is-layout-requested=false, has-input-connection=false, x=0.0, y=0.0, child-count=5}}]
at dalvik.system.VMStack.getThreadStackTrace(Native Method)
at java.lang.Thread.getStackTrace(Thread.java:1566)
at android.support.test.espresso.base.DefaultFailureHandler.getUserFriendlyError(DefaultFailureHandler.java:92)
at android.support.test.espresso.base.DefaultFailureHandler.handle(DefaultFailureHandler.java:56)
at android.support.test.espresso.ViewInteraction.runSynchronouslyOnUiThread(ViewInteraction.java:184)
at android.support.test.espresso.ViewInteraction.check(ViewInteraction.java:158)
at uk.co.imagitech.learn2.hp.MainActivityConnectedTest.doesntShowMeteredDialogAtStart(MainActivityConnectedTest.java:43)
at java.lang.reflect.Method.invoke(Native Method)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at android.support.test.internal.statement.UiThreadStatement.evaluate(UiThreadStatement.java:55)
at android.support.test.rule.ActivityTestRule$ActivityStatement.evaluate(ActivityTestRule.java:270)
at org.junit.rules.RunRules.evaluate(RunRules.java:20)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.junit.runners.Suite.runChild(Suite.java:128)
at org.junit.runners.Suite.runChild(Suite.java:27)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at org.junit.runner.JUnitCore.run(JUnitCore.java:115)
at android.support.test.internal.runner.TestExecutor.execute(TestExecutor.java:59)
at android.support.test.runner.AndroidJUnitRunner.onStart(AndroidJUnitRunner.java:262)
at uk.co.imagitech.learn2.hp.TestButlerAndroidRunner.onStart(TestButlerAndroidRunner.java:17)
at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1932)

Answer 1

在显示之前，您无法检查对话框的文本是否显示。

onView(withText("Mobile connection")).inRoot(isDialog()) .check(doesNotExist());

您可能知道，此代码检查 Dialog 是否有显示文本的视图，但由于没有对话框，您无法完成这部分测试。它是说：“没有根，没有对话框，我怎么能做到这一点？”

在加载之前不要检查视图的属性。

Answer 2

piotrek 的建议对我不起作用。 同样的NoMatchingRootException 总是从 Espresso 中抛出。

这是有效的：

onView(withText("DIALOG_MESSAGE")).check(doesNotExist())

Roboelectric 测试代码：

  @Test
  fun canShowBlockingDialog() {
    val scenario = launchActivity<FragmentScenario.EmptyFragmentActivity>()
    scenario.onActivity {
      //I need to set a support Theme otherwise we can't create MaterialAlertDialogs
      it.setTheme(R.style.AppTheme_NoActionBar)
      //this method is an extension function which shows a MaterialAlertDialog 
      //with an OK button
      it.showBlockingDialog("DIALOG_MESSAGE", "DIALOG_TITLE")
      onView(withText("DIALOG_MESSAGE")).inRoot(isDialog()).check(matches(isDisplayed()))
      onView(withText("DIALOG_TITLE")).inRoot(isDialog()).check(matches(isDisplayed()))
      onView(withText("OK")).inRoot(isDialog()).check(matches(isDisplayed()))
      //press the OK button to close the dialog     
    onView(withText("OK")).inRoot(isDialog()).perform(scrollTo()).perform(click())
      //check that DIALOG_MESSAGE is not on screen anymore
      onView(withText("DIALOG_MESSAGE")).check(doesNotExist())
    }
    scenario.close()
  }