Checking toast message in android espresso

Question

Would anyone know how to test for the appearance of a Toast message in android espresso? In robotium its easy & I used but started working in espresso but dont getting the exact command.

Answer 1

This slightly long statement works for me:

import static android.support.test.espresso.assertion.ViewAssertions.matches; import static android.support.test.espresso.matcher.RootMatchers.withDecorView; import static android.support.test.espresso.matcher.ViewMatchers.isDisplayed; import static android.support.test.espresso.matcher.ViewMatchers.withText; import static org.hamcrest.Matchers.is; import static org.hamcrest.Matchers.not; .... onView(withText(R.string.TOAST_STRING)).inRoot(withDecorView(not(is(getActivity().getWindow().getDecorView())))).check(matches(isDisplayed())); 

Answer 2

The accepted answer is a good one but didn't work for me. So I searched a bit and found this blog article. This gave me an idea of how to do it and I updated the solution above.

First I implemented the ToastMatcher:

import android.os.IBinder; import android.support.test.espresso.Root; import android.view.WindowManager; import org.hamcrest.Description; import org.hamcrest.TypeSafeMatcher;  public class ToastMatcher extends TypeSafeMatcher<Root> {    @Override   public void describeTo(Description description) {     description.appendText("is toast");   }    @Override   public boolean matchesSafely(Root root) {     int type = root.getWindowLayoutParams().get().type;     if (type == WindowManager.LayoutParams.TYPE_TOAST) {         IBinder windowToken = root.getDecorView().getWindowToken();         IBinder appToken = root.getDecorView().getApplicationWindowToken();         if (windowToken == appToken) {             // windowToken == appToken means this window isn't contained by any other windows.             // if it was a window for an activity, it would have TYPE_BASE_APPLICATION.             return true;         }     }     return false;   }  } 

Then I implemented my check methods like this:

public void isToastMessageDisplayed(int textId) {     onView(withText(textId)).inRoot(MobileViewMatchers.isToast()).check(matches(isDisplayed())); } 

MobileViewMatchers is a container for accessing the matchers. There I defined the static method isToast().

public static Matcher<Root> isToast() {     return new ToastMatcher(); } 

This works like a charm for me.