I think the other teams in the league are realising just how good Tomiyasu is and how much stability he brings to our right side - which has been a major point of weakness in the past that teams have exposed. White is very good with the ball at his feet, but is still learning when it comes to his positioning and Tomiyasu is helping him a lot.
Over the last couple of games Tomiyasu has definitely been targeted - 1 clear red card challenge on him unpunished (face stamp) and then the potential ankle breaker against Leeds.
He'll definitely be tested further, but the signs are he can handle himself well.