Update tests/core/linter/test_builtin.py

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: benfdking

tests/core/linter/test_builtin.py

@@ -4,7 +4,13 @@
 
 
 def test_no_unregistered_external_models(tmp_path, copy_to_temp_path) -> None:
-    """Tests that it returns a correct"""
+    """
+    Tests that the linter correctly identifies unregistered external model dependencies.
+    
+    This test removes the `external_models.yaml` file from the sushi example project,
+    enables the linter, and verifies that the linter raises a violation for a model
+    that depends on unregistered external models.
+    """
     sushi_paths = copy_to_temp_path("examples/sushi")
     sushi_path = sushi_paths[0]