TEST: Add unit to bad set_zoom call

Author: effigies

nibabel/tests/test_spatialimages.py

@@ -552,7 +552,7 @@ def test_zooms(self):
         with assert_raises(ValueError):
             img.header.get_zooms(units='badarg')
         with assert_raises(HeaderDataError):
-            img.header.set_zooms((-1, 1, 1, 1))
+            img.header.set_zooms((-1, 1, 1, 1), units='norm')
 
     def test_zooms_edge_cases(self):
         ''' Override for classes where *_norm_zooms != *_zooms '''