我正在尝试进行仪器测试。我在youtube上执行。我的初始测试运行正常，但断言失败。我想要实现的是打开youtube搜索内容并通过检查结果中是否存在来断言。因此，我搜索“驱魔楼梯场景”，并断言是否确实找到了结果。但是我收到了AssertionError。我在做什么错？/这是正确的方法吗？
以下是我的代码
Context context = InstrumentationRegistry.getInstrumentation().getContext(); //gets the context based on the instrumentation
Intent intent = context.getPackageManager().getLaunchIntentForPackage("com.google.android.youtube"); //sets the intent to start your app
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK); //clear out any previous task, i.e., make sure it starts on the initial screen
context.startActivity(intent);
UiDevice mDevice = UiDevice.getInstance(InstrumentationRegistry.getInstrumentation());
UiObject icon = mDevice.findObject(new UiSelector().descriptionContains("Search"));
icon.waitForExists(5000);
icon.click();
UiObject editText = mDevice.findObject(new UiSelector().text("Search YouTube"));
editText.waitForExists(5000);
editText.setText("Exorcist staircase scene");
mDevice.pressEnter();
UiScrollable listView = new UiScrollable(new UiSelector().scrollable(
true));
listView.setAsHorizontalList();
int index =0;
if(index <= listView.getChildCount()){
> Assert.assertTrue(listView.getChild(new
> UiSelector().index(index).resourceId("com.google.android.youtube:id/title").descriptionContains("Exorcist")).exists());
//listView.getChild(new UiSelector().index(index).descriptionContains("Exorcist")).exists();
}
synchronized (mDevice) {
mDevice.wait(20000);
}
这是我出错的地方
Assert.assertTrue（listView.getChild（新 UiSelector（）。index（index）.resourceId（“ com.google.android.youtube:id/title”）。descriptionContains（“ Exorcist”））。exists（））;
My error log
> java.lang.AssertionError
at org.junit.Assert.fail(Assert.java:86)
at org.junit.Assert.assertTrue(Assert.java:41)
at org.junit.Assert.assertTrue(Assert.java:52)
at com.protossoft.root.uitestingapplication.ExampleInstrumentedTest.useAppContext(ExampleInstrumentedTest.java:66)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
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.runner.junit4.statement.RunBefores.evaluate(RunBefores.java:80)
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.runners.ParentRunner.run(ParentRunner.java:363)
at android.support.test.runner.AndroidJUnit4.run(AndroidJUnit4.java:101)
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$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at org.junit.runner.JUnitCore.run(JUnitCore.java:115)
at android.support.test.internal.runner.TestExecutor.execute(TestExecutor.java:56)
at android.support.test.runner.AndroidJUnitRunner.onStart(AndroidJUnitRunner.java:384)
at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1867)
Tests ran to completion.
谢谢：）