Espresso意图测试失败

Question

我正在学习使用浓缩咖啡的android仪器测试。我有一个带抽屉菜单的应用程序，有一个名为About的菜单。我正在测试点击该菜单项和活动内容。

testfunction：

  @Test
public void testNavigationDrawerAboutMenu() {
    onView(withId(R.id.drawer_layout))
            .perform(DrawerActions.open()); //open drawer
    onView(withText("About")).perform(click());
    onView(withId(R.id.aboutsptemail)).check(matches(withText(R.string.screen_about_support_email)));
    onView(withId(R.id.aboutcpright)).check(matches(isDisplayed()));
    onView(withId(R.id.aboutprivacy)).check(matches(isDisplayed()));
    onView(withId(R.id.abouttermsconditions)).check(matches(isDisplayed()));
    onView(withId(R.id.aboutsptemail)).perform(click());
}

现在最后一个textview中嵌入了weblink。因此，当您单击它时，它会在应用程序的Web视图中打开链接（www.support.com）。我想测试这个功能。所以我试过这个：

intended(hasComponent(WebViewActivity.class.getName())); //check if webview called on supportEmail link click

但是此错误跟踪测试失败：

java.lang.NullPointerException: Attempt to invoke virtual method 'android.support.test.espresso.intent.OngoingStubbing android.support.test.espresso.intent.Intents.internalIntending(org.hamcrest.Matcher)' on a null object reference
at android.support.test.espresso.intent.Intents.intending(Intents.java:155)
at com.ScanBuy.SmartLabel.NavigationDrawerActivityTests.testNavigationDrawerAboutMenu(NavigationDrawerActivityTests.java:94)
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.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.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$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at org.junit.runner.JUnitCore.run(JUnitCore.java:115)
at android.support.test.internal.runner.TestExecutor.execute(TestExecutor.java:59)
at android.support.test.runner.AndroidJUnitRunner.onStart(AndroidJUnitRunner.java:262)
at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1879)

我还尝试通过在检查意图之前空闲资源来解决问题。但没有奏效。有人可以帮忙吗？

Answer 1

我有同样的问题，并通过使用IntentsTestRule而不是ActivityTestRule解决它。 IntentsTestRule是ActivityTestRule的子类。设置你的@Rule创建活动，如下所示：

@Rule
public IntentsTestRule<MyActivity> mActivity = new IntentsTestRule<MyActivity>(MyActivity.class) {
    @Override
    protected Intent getActivityIntent() {
        ...
    }
};

有关更多信息，请参阅以下项目：https://github.com/googlesamples/android-testing/tree/master/ui/espresso/IntentsBasicSample

Answer 2

如果您使用的是自定义ActivityTestRule，则可以添加正确的Intents.init(), Intents.release()调用：

@Override
protected void afterActivityLaunched() {
    Intents.init();
    super.afterActivityLaunched();
}

@Override
protected void afterActivityFinished() {
    super.afterActivityFinished();
    Intents.release();
}

Answer 3

我有同样的问题，然而，切换到IntentsTestRule也不起作用。所以我切换回ActivityTestRule并在测试之后调用了Intents.init()和发送意图的Intents.release()。

有关更多信息，请参阅此reference。