Added small test

pystencils_tests/test_simplifications.py

@@ -136,7 +136,7 @@ def test_add_subexpressions_for_field_reads():
 
     main = [Assignment(s[0, 0](0), 3 * v[0, 0](0)),
             Assignment(s[0, 0](1), 10 * v[0, 0](1))]
-    
+
     ac = AssignmentCollection(main, subexpressions)
     assert len(ac.subexpressions) == 0
     ac2 = add_subexpressions_for_field_reads(ac)