You can rely on the BBC to describe a law that asks prospective immigrants to France to prove that they are indeed related to the people they claim to be related to as 'controversial'.
The tests are designed to speed up the application process; they aren't even mandatory, and the French government will meet the cost. But none of this has prevented howls of protest, and cries of 'racism' from immigrants' groups. The BBC reports:
The legislation asks immigrant family members older than 16 to take a test in their country of origin, demonstrating a good knowledge of French language and values.
Applicants also have to prove that their family in France could support them and earn at least the minimum wage.
All perfectly reasonable, and the sort of measures the UK should have adopted years ago. The fact that the likes of the BBC and immigrant welfare groups seem to think that such common-sense policies are controversial just shows how far out of step they are with ordinary people.