o Add assert and check warnings

Author: Rajeev Jain

test/test_io_common.py

@@ -104,7 +104,8 @@ def test_ugrid_compliance(self, grid_from_format):
         assert 'n_face' in grid.dims
 
         # Validate grid structure
-        grid.validate()
+        with pytest.warns(None):
+            assert grid.validate() is True
 
         # Check UGRID compliance
         # 1. Connectivity should use proper fill values