More specific error message in test_writing

Author: duckontheweb

tests/test_writing.py

@@ -74,7 +74,7 @@ def validate_catalog_link_type(
             cat_dict = pystac.StacIO.default().read_json(href)
             cat = pystac.read_file(href)
             if not isinstance(cat, pystac.Catalog):
-                raise pystac.STACTypeError(f"File at {href} is not a Catalog.")
+                raise pystac.STACTypeError(f"File at {href} is a {cat.STAC_OBJECT_TYPE} not a Catalog.")
 
             rels = set([link["rel"] for link in cat_dict["links"]])
             self.assertEqual("self" in rels, should_include_self)