TST: Add test with coordinates as float32.
TST: Add test with coordinates as float32.

villalonreina/dipy,FrancoisRheaultUS/dipy,StongeEtienne/dipy,nilgoyyou/dipy,villalonreina/dipy,matthieudumont/dipy,matthieudumont/dipy,FrancoisRheaultUS/dipy,StongeEtienne/dipy,nilgoyyou/dipy