Merge remote-tracking branch 'playpauseandstop/master'

* playpauseandstop/master:
  Provide test cases to previous fix to ensure proper error handling items errors.
  Fix formatting error for unique items if instance is tuple.

jsonschema/_validators.py

@@ -133,7 +133,7 @@ def uniqueItems(validator, uI, instance, schema):
         validator.is_type(instance, "array") and
         not _utils.uniq(instance)
     ):
-        yield ValidationError("%r has non-unique elements" % instance)
+        yield ValidationError("%r has non-unique elements" % (instance,))
 
 
 def pattern(validator, patrn, instance, schema):

jsonschema/tests/test_validators.py

@@ -899,6 +899,66 @@ def test_helpful_error_message_on_failed_pop_scope(self):
         self.assertIn("Failed to pop the scope", str(exc.exception))
 
 
+OVERRIDE_ARRAY_TYPES = Draft4Validator.DEFAULT_TYPES.copy()
+OVERRIDE_ARRAY_TYPES['array'] = (list, tuple)
+
+
+class ItemsErrorsMixin(object):
+
+    array_type = list
+    schema = {
+        'type': 'array',
+        'items': {
+            'type': 'number',
+        },
+        'minItems': 2,
+        'maxItems': 3,
+        'uniqueItems': True,
+    }
+    validator_class = None
+
+    def check_error_message(self, instance):
+        self.assertIsNotNone(self.validator_class)
+        self.assertRaises(ValidationError,
+                          validate,
+                          instance,
+                          self.schema,
+                          self.validator_class)
+
+    def test_min_items(self):
+        self.check_error_message(self.array_type([1]))
+
+    def test_max_items(self):
+        self.check_error_message(self.array_type([1, 2, 3, 4]))
+
+    def test_unique_items(self):
+        self.check_error_message(self.array_type([1, 1, 2]))
+
+    def test_valid(self):
+        self.assertIsNotNone(self.validator_class)
+        validate(self.array_type([1, 2]), self.schema, self.validator_class)
+
+
+class OverrideArrayTypeValidator(Draft4Validator):
+
+    DEFAULT_TYPES = OVERRIDE_ARRAY_TYPES
+
+
+class TestItemsErrorsDraft3(ItemsErrorsMixin, unittest.TestCase):
+
+    validator_class = Draft3Validator
+
+
+class TestItemsErrorsDraft4(ItemsErrorsMixin, unittest.TestCase):
+
+    validator_class = Draft4Validator
+
+
+class TestItemsErrorMessagesCustom(ItemsErrorsMixin, unittest.TestCase):
+
+    validator_class = OverrideArrayTypeValidator
+
+
 def sorted_errors(errors):
     def key(error):
         return (