Android Espresso: How check "drawableStart" of EditText?

Issue

I have my xml layout:

<EditText
            android:id="@+id/passwordEditText"
            android:layout_width="0dp"
            android:layout_height="45dp"
            android:layout_marginBottom="20dp"
            android:drawableStart="@drawable/ic_sign_in_password"
            android:drawablePadding="15dp"
            android:hint="@string/password"
android:textSize="15sp"/>

I want to write Espresso test check that EditText has android:drawableStart="@drawable/ic_sign_in_password".

How I can do this?

Solution

Create a helper method sameBitmap comparing 2 drawables.

private static boolean sameBitmap(Drawable actualDrawable, Drawable expectedDrawable) {
    if (actualDrawable == null || expectedDrawable == null) {
        return false;
    }

    if (actualDrawable instanceof StateListDrawable && expectedDrawable instanceof StateListDrawable) {
        actualDrawable = actualDrawable.getCurrent();
        expectedDrawable = expectedDrawable.getCurrent();
    }
    if (actualDrawable instanceof BitmapDrawable) {
        Bitmap bitmap = ((BitmapDrawable) actualDrawable).getBitmap();
        Bitmap otherBitmap = ((BitmapDrawable) expectedDrawable).getBitmap();
        return bitmap.sameAs(otherBitmap);
    }

    if (actualDrawable instanceof VectorDrawable ||
            actualDrawable instanceof VectorDrawableCompat ||
            actualDrawable instanceof GradientDrawable) {
        Rect drawableRect = actualDrawable.getBounds();
        Bitmap bitmap = Bitmap.createBitmap(drawableRect.width(), drawableRect.height(), Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(bitmap);
        actualDrawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
        actualDrawable.draw(canvas);

        Bitmap otherBitmap = Bitmap.createBitmap(drawableRect.width(), drawableRect.height(), Bitmap.Config.ARGB_8888);
        Canvas otherCanvas = new Canvas(otherBitmap);
        expectedDrawable.setBounds(0, 0, otherCanvas.getWidth(), otherCanvas.getHeight());
        expectedDrawable.draw(otherCanvas);
        return bitmap.sameAs(otherBitmap);
    }
    return false;
}

Then, create a matcher that checks relative drawables. Here, it verifies only drawable start but you can extend it on our own if you'd like to verify drawable end or top or bottom:

private static Matcher<View> withRelativeDrawables(int expectedDrawableStart) {
    return new TypeSafeMatcher<View>() {
        @Override
        protected boolean matchesSafely(View item) {
            if (item instanceof TextView) {
                TextView textView = (TextView) item;
                //get an array of 4 relative drawables. The first one is drawable start
                Drawable[] relativeDrawables = textView.getCompoundDrawablesRelative();

                Drawable expectedDrawableStart = ContextCompat.getDrawable(context, expectedDrawableStart);
                return sameBitmap(relativeDrawables[0], expectedDrawableStart);
            }
            return false;
        }

        @Override
        public void describeTo(Description description) {

        }
    };
} 

And then use it as below:

onView(withId(R.id.passwordEditText)).check(matches(withRelativeDrawables(R.drawable.ic_sign_in_password)));

Answered By - Anatolii