Switch operation_name to operationName in GraphQLTestCase (#936)

* Add op_name test

* Replace "operation_name" with "operationName"

* Improve test comments

* Add method for Python 2.7

graphene_django/tests/test_utils.py

@@ -1,6 +1,10 @@
-from django.utils.translation import gettext_lazy
+import json
 
-from ..utils import camelize, get_model_fields
+import pytest
+from django.utils.translation import gettext_lazy
+from mock import patch
+
+from ..utils import camelize, get_model_fields, GraphQLTestCase
 from .models import Film, Reporter
 
 
@@ -30,3 +34,27 @@ def test_camelize():
         "valueA": "value_b"
     }
     assert camelize({0: {"field_a": ["errors"]}}) == {0: {"fieldA": ["errors"]}}
+
+
+@pytest.mark.django_db
+@patch("graphene_django.utils.testing.Client.post")
+def test_graphql_test_case_op_name(post_mock):
+    """
+    Test that `GraphQLTestCase.query()`'s `op_name` argument produces an `operationName` field.
+    """
+
+    class TestClass(GraphQLTestCase):
+        GRAPHQL_SCHEMA = True
+
+        def runTest(self):
+            pass
+
+    tc = TestClass()
+    tc.setUpClass()
+    tc.query("query { }", op_name="QueryName")
+    body = json.loads(post_mock.call_args.args[1])
+    # `operationName` field from https://graphql.org/learn/serving-over-http/#post-request
+    assert (
+        "operationName",
+        "QueryName",
+    ) in body.items(), "Field 'operationName' is not present in the final request."

graphene_django/utils/testing.py

@@ -32,20 +32,20 @@ class GraphQLTestCase(TestCase):
                                 supply the op_name.  For annon queries ("{ ... }"),
                                 should be None (default).
             input_data (dict) - If provided, the $input variable in GraphQL will be set
-                                to this value. If both ``input_data`` and ``variables``, 
+                                to this value. If both ``input_data`` and ``variables``,
                                 are provided, the ``input`` field in the ``variables``
                                 dict will be overwritten with this value.
             variables (dict)  - If provided, the "variables" field in GraphQL will be
                                 set to this value.
             headers (dict)    - If provided, the headers in POST request to GRAPHQL_URL
-                                will be set to this value. 
+                                will be set to this value.
 
         Returns:
             Response object from client
         """
         body = {"query": query}
         if op_name:
-            body["operation_name"] = op_name
+            body["operationName"] = op_name
         if variables:
             body["variables"] = variables
         if input_data: