Revert style changes and test_it_does_not_validate_formats_by_default

Author: manycoding

jsonschema/_validators.py

@@ -186,11 +186,12 @@ def uniqueItems(validator, uI, instance, schema):
         yield ValidationError("%r has non-unique elements" % (instance,))
 
 
-def pattern(validator, pattern, instance, schema):
-    if (validator.is_type(instance, "string") and not
-        re.search(pattern, instance)):
-        yield ValidationError("{} does not match {}".format(
-            instance, pattern))
+def pattern(validator, patrn, instance, schema):
+    if (
+        validator.is_type(instance, "string") and
+        not re.search(patrn, instance)
+    ):
+        yield ValidationError("%r does not match %r" % (instance, patrn))
 
 
 def format(validator, format, instance, schema):

jsonschema/tests/test_validators.py

@@ -1139,9 +1139,9 @@ def test_it_returns_true_for_formats_it_does_not_know_about(self):
         )
         validator.validate("bugs")
 
-    def test_it_validates_formats_by_default(self):
+    def test_it_does_not_validate_formats_by_default(self):
         validator = self.Validator({})
-        self.assertIsInstance(validator.format_checker, FormatChecker)
+        self.assertIsNone(validator.format_checker)
 
     def test_it_validates_formats_if_a_checker_is_provided(self):
         checker = FormatChecker()