Fix the error properties for propertyNames.

Note that propertyNames is another example (like #119)
of something that needs an additional way to say it
has errored on a *key* within the instance.

So, that's still missing, but path is not the right
thing, same as in the earlier instances.

It's also becoming somewhat clear that compound
validators should possibly grow a way to become lazy...

2 files changed, 14 insertions, 1 deletions

diff --git a/jsonschema/_validators.py b/jsonschema/_validators.py
index 507305e..9b8cc17 100644
--- a/jsonschema/_validators.py
+++ b/jsonschema/_validators.py
@@ -26,7 +26,6 @@ def propertyNames(validator, propertyNames, instance, schema):
         for error in validator.descend(
             instance=property,
             schema=propertyNames,
-            path=property,  # FIXME: path?
         ):
             yield error
 
diff --git a/jsonschema/tests/test_validators.py b/jsonschema/tests/test_validators.py
index 7a91f34..466ccd6 100644
--- a/jsonschema/tests/test_validators.py
+++ b/jsonschema/tests/test_validators.py
@@ -881,6 +881,20 @@ class TestValidationErrorDetails(TestCase):
         self.assertEqual(e1.validator, "type")
         self.assertEqual(e2.validator, "minimum")
 
+    def test_propertyNames(self):
+        instance = {"foo": 12}
+        schema = {"propertyNames": {"not": {"const": "foo"}}}
+
+        validator = validators.Draft7Validator(schema)
+        error, = validator.iter_errors(instance)
+
+        self.assertEqual(error.validator, "not")
+        self.assertEqual(
+            error.message,
+            "%r is not allowed for %r" % ({"const": "foo"}, "foo"),
+        )
+        self.assertEqual(error.path, deque([]))
+
 
 class MetaSchemaTestsMixin(object):
     # TODO: These all belong upstream