ToastMatcher

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();
                return windowToken == appToken;
            }
            return false;
        }

    }