This drawable matcher helps you to assert that ImageView has specific drawable set. This is to be used in Espresso test cases for your Android app

EspressoDrawableMatcher.kt

/**
 * Credit https://github.com/dbottillo/Blog/blob/espresso_match_imageview/app/src/androidTest/java/com/danielebottillo/blog/config/DrawableMatcher.java
 * Original Author: https://github.com/dbottillo
 * Converted to Kotlin by Hardik Trivedi
 */
class DrawableMatcher internal constructor(private val expectedId: Int) :
    TypeSafeMatcher<View>(View::class.java) {
    private var resourceName: String? = null

    override fun matchesSafely(target: View): Boolean {
        if (target !is ImageView) {
            return false
        }
        if (expectedId == EMPTY) {
            return target.drawable == null
        }
        if (expectedId == ANY) {
            return target.drawable != null
        }
        val resources = target.getContext().resources
        val expectedDrawable = ContextCompat.getDrawable(target.getContext(), expectedId)
        resourceName = resources.getResourceEntryName(expectedId)

        if (expectedDrawable == null) {
            return false
        }

        val bitmap = getBitmap(target.drawable)
        val otherBitmap = getBitmap(expectedDrawable)
        return bitmap.sameAs(otherBitmap)
    }

    private fun getBitmap(drawable: Drawable): Bitmap {
        val bitmap = Bitmap.createBitmap(
            drawable.intrinsicWidth,
            drawable.intrinsicHeight,
            Bitmap.Config.ARGB_8888
        )
        val canvas = Canvas(bitmap)
        drawable.setBounds(0, 0, canvas.width, canvas.height)
        drawable.draw(canvas)
        return bitmap
    }

    override fun describeTo(description: Description) {
        description.appendText("with drawable from resource id: ")
        description.appendValue(expectedId)
        if (resourceName != null) {
            description.appendText("[")
            description.appendText(resourceName)
            description.appendText("]")
        }
    }

    companion object {
        internal val EMPTY = -1
        internal val ANY = -2
    }
}
    
// Using DrawableMatcher

fun withDrawable(@DrawableRes resourceId: Int): Matcher<View> {
    return DrawableMatcher(resourceId)
}

onView(withId(R.id.ID_OF_YOUR_IMAGEVIEW)).check(matches(withDrawable(R.drawable.YOUR_DRAWABLE_RES_NAME)));