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kotlinlang

I want to test an `IconButton` like following
```IconButton(modifier = Modifier.padding(16.dp).testTag(WatchlistButtonTestTag), onClick = onClick) {
    if (inWatchlist) {
        Image(asset = vectorResource(id = R.drawable.ic_bookmark_color))
    } else {
        Icon(asset = vectorResource(id = R.drawable.ic_bookmark_bw))
    }
}```
I get the button from test with `rule.onNodeWithTag(WatchlistButtonTestTag)`
Now I wanna verify its inner Drawable.
What is the best way?