Fix tests failing sometimes because of ordering issue

Author: dittos

tests/core_validation/utils.py

@@ -132,10 +132,21 @@ def expect_valid(schema, rules, query):
     assert errors == [], 'Should validate'
 
 
+def sort_lists(value):
+    if isinstance(value, dict):
+        new_mapping = {}
+        for k, v in value.iteritems():
+            new_mapping[k] = sort_lists(v)
+        return new_mapping
+    elif isinstance(value, list):
+        return sorted(map(sort_lists, value))
+    return value
+
+
 def expect_invalid(schema, rules, query, expected_errors):
     errors = validate(schema, parse(query), rules)
     assert errors, 'Should not validate'
-    assert map(format_error, errors) == expected_errors
+    assert sort_lists(map(format_error, errors)) == sort_lists(expected_errors)
 
 
 def expect_passes_rule(rule, query):