fix: display errors when schema validation fails

Author: chronicc

src/molecule/config.py

@@ -751,7 +751,8 @@ def _validate(self) -> None:
 
         errors = schema_v3.validate(self.config)
         if errors:
-            msg = f"Failed to validate {self.molecule_file}\n\n{errors}"
+            errors_resolved = "\n".join(errors)
+            msg = f"Failed to validate {self.molecule_file}\n\n{errors_resolved}"
             sysexit_with_message(msg, code=1)
 
 

tests/unit/test_config.py

@@ -461,7 +461,7 @@ def test_validate_exists_when_validation_fails(  # noqa: D103
     config_instance: config.Config,
 ) -> None:
     m = mocker.patch("molecule.model.schema_v3.validate")
-    m.return_value = "validation errors"
+    m.return_value = ["validation errors"]
 
     with pytest.raises(SystemExit) as e:
         config_instance._validate()