是否可以使用 Espresso 的 IdlingResource 等到某个视图出现?
在我的测试中,我有一个阶段,在按下按钮后,应用程序会执行大量异步计算并向云服务发出请求,之后它会显示某个视图.
In my test I have a stage where after pressing a button application does a lot of asynchronous calculations and requests to the cloud service, after which it displays a certain view.
是否可以使用 Espresso 的 IdlingResource
实现等到某个视图出现?
Is it possible to use Espresso's IdlingResource
implementation to wait until a certain view appears?
我已阅读此处的答案,并且评论似乎表明您可以使用 IdlingResource
代替,但我不明白如何.Espresso 似乎没有任何内置方法来处理长操作,但必须编写自己的等待循环感觉就像是 hack.
I've read an answers here and comments seems to suggest that you can use IdlingResource
instead, but I don't understand how. Espresso does not seem to have any built-in way to handle long operations, but having to write your own waiting loops feels like a hack.
有什么方法可以解决这个问题,或者我应该按照链接线程中的答案建议做吗?
Any way to solve this or should I just do as the answer in the linked thread suggests?
推荐答案
您的 IdlingResource 可能如下所示:
Your IdlingResource could look like this:
import android.support.test.espresso.IdlingResource;
import android.support.test.espresso.ViewFinder;
import android.support.test.espresso.ViewInteraction;
import android.view.View;
import org.hamcrest.Matcher;
import java.lang.reflect.Field;
import static android.support.test.espresso.Espresso.onView;
public class ViewShownIdlingResource implements IdlingResource {
private static final String TAG = ViewShownIdlingResource.class.getSimpleName();
private final Matcher<View> viewMatcher;
private ResourceCallback resourceCallback;
public ViewShownIdlingResource(final Matcher<View> viewMatcher) {
this.viewMatcher = viewMatcher;
}
@Override
public boolean isIdleNow() {
View view = getView(viewMatcher);
boolean idle = view == null || view.isShown();
if (idle && resourceCallback != null) {
resourceCallback.onTransitionToIdle();
}
return idle;
}
@Override
public void registerIdleTransitionCallback(ResourceCallback resourceCallback) {
this.resourceCallback = resourceCallback;
}
@Override
public String getName() {
return this + viewMatcher.toString();
}
private static View getView(Matcher<View> viewMatcher) {
try {
ViewInteraction viewInteraction = onView(viewMatcher);
Field finderField = viewInteraction.getClass().getDeclaredField("viewFinder");
finderField.setAccessible(true);
ViewFinder finder = (ViewFinder) finderField.get(viewInteraction);
return finder.getView();
} catch (Exception e) {
return null;
}
}
}
然后,您可以创建一个等待您的视图的辅助方法:
Then, you could create a helper method waiting for your view:
public void waitViewShown(Matcher<View> matcher) {
IdlingResource idlingResource = new ViewShownIdlingResource(matcher);///
try {
IdlingRegistry.getInstance().register(idlingResource);
onView(matcher).check(matches(isDisplayed()));
} finally {
IdlingRegistry.getInstance().unregister(idlingResource);
}
}
最后,在你的测试中:
@Test
public void someTest() {
waitViewShown(withId(R.id.<some>));
//do whatever verification needed afterwards
}
您可以通过让 IdlingResource 等待任何条件来改进此示例,而不仅仅是等待可见性条件.
You could improve this example by making IdlingResource wait for any condition, not just for the visibility one.
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