Improve name type validation in test_field_init_param_types for Field initialization

Author: nilodna

tests/test_field.py

@@ -15,8 +15,13 @@
 def test_field_init_param_types():
     data = datasets_structured["ds_2d_left"]
     grid = XGrid.from_dataset(data)
-    with pytest.raises(ValueError, match="Expected `name` to be a string"):
-        Field(name=123, data=data["data_g"], grid=grid)
+
+    with pytest.raises(TypeError, match="Expected a string for variable name, got int instead."):
+        Field(name=123, data=data['data_g'], grid=grid)
+
+    for name in ["a b", "123", "while"]:
+        with pytest.raises(ValueError, match=r"Received invalid Python variable name.*"):
+            Field(name=name, data=data['data_g'], grid=grid)
 
     with pytest.raises(ValueError, match="Expected `data` to be a uxarray.UxDataArray or xarray.DataArray"):
         Field(name="test", data=123, grid=grid)