Espresso testing Drawables with color filters

DrawableMatcher.java

public class DrawableMatcher extends TypeSafeMatcher<View> {
    
    public interface Extractor {
        @NonNull Drawable extract(@NonNull View v);
    }
    
    private String mReason;
    @DrawableRes private final int mDrawableId;
    private ColorFilter mExpectedColorFilter;
    private Extractor mExtractor;
    DrawableMatcher(@DrawableRes int drawableId, @Nullable ColorFilter expectedColorFilter, Extractor extractor) {
        mDrawableId = drawableId;
        mExpectedColorFilter = expectedColorFilter;
        mExtractor = extractor;
    }
    @Override
    protected boolean matchesSafely(View target) {
        if (!(target instanceof ImageView) && mExtractor == null) {
            mReason = "view " + target.getId() + " is not an " + ImageView.class.getSimpleName() + ". Pass in a custom Extractor in order to use this matcher.";
            return false;
        }
        Drawable actualDrawable = mExtractor == null ? defaultExtract(target) : mExtractor.extract(target);
        if (mDrawableId < 0 && actualDrawable != null) {
            mReason = "expected no drawable for view " + target.getId() + ", but has one";
            return false;
        }
        Drawable expectedDrawable = ViewTestUtil.drawableById(target.getContext(), mDrawableId);
        if (expectedDrawable == null) {
            mReason = "drawable with id " + mDrawableId + " does not exist";
            return false;
        }
        expectedDrawable.setColorFilter(mExpectedColorFilter);
        if (!ViewTestUtil.getBitmap(expectedDrawable).sameAs(ViewTestUtil.getBitmap(actualDrawable))) {
            mReason = "expected and actual bitmaps do not match";
            return false;
        }
        return true;
    }
    @Override
    public void describeTo(Description description) {
        description.appendText(mReason == null ? "" : mReason);
    }
    private static Drawable defaultExtract(View target) {
        ImageView targetImageView = (ImageView) target;
        return targetImageView.getDrawable();
    }
}

ViewTestUtil.java

public abstract class ViewTestUtil {

    public static Bitmap getBitmap(Drawable drawable) {
        Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(bitmap);
        drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
        drawable.draw(canvas);
        return bitmap;
    }

    public static Drawable drawableById(Context context, @DrawableRes int id) {
        final Drawable drawable = ContextCompat.getDrawable(context, id);
        return Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP
                ? (DrawableCompat.wrap(drawable)).mutate()
                : drawable;
    }
}