TST: Test for the case where streamlines are transformed by an affine.
TST: Test for the case where streamlines are transformed by an affine.

FrancoisRheaultUS/dipy,nilgoyyou/dipy,demianw/dipy,FrancoisRheaultUS/dipy,villalonreina/dipy,JohnGriffiths/dipy,StongeEtienne/dipy,matthieudumont/dipy,sinkpoint/dipy,StongeEtienne/dipy,demianw/dipy,villalonreina/dipy,sinkpoint/dipy,JohnGriffiths/dipy,matthieudumont/dipy,nilgoyyou/dipy