@Override
            protected void describeMoreTo(Description description) {
                description.appendText("has drawable");
            }
A Matcher for Espresso that checks if an ImageView has a drawable applied to it.
ui/espresso/IntentsAdvancedSample/app/src/androidTest/java/com/example/android/testing/espresso/intents/AdvancedSample/ImageViewHasDrawableMatcher.java