Fix test, as pragma string 'x+y' no is now properly parsed as Sum

Author: MichaelSt98

loki/tests/test_subroutine.py

@@ -644,7 +644,7 @@ def test_routine_variables_dimension_pragmas(frontend):
     assert fexprgen(routine.variable_map['v3'].shape) == '(x, y, :)'
     assert fexprgen(routine.variable_map['v4'].shape) == '(x, y)'
     assert fexprgen(routine.variable_map['v5'].shape) == '(y, :)'
-    assert fexprgen(routine.variable_map['v6'].shape) == '(x+y,)'
+    assert fexprgen(routine.variable_map['v6'].shape) == '(x + y,)'
 
 
 @pytest.mark.parametrize('frontend', available_frontends())