Document using graphql_query in a pytest fixture

Also add a test

docs/testing.rst

@@ -1,6 +1,9 @@
 Testing API calls with django
 =============================
 
+Using unittest
+--------------
+
 If you want to unittest your API calls derive your test case from the class `GraphQLTestCase`.
 
 Your endpoint is set through the `GRAPHQL_URL` attribute on `GraphQLTestCase`. The default endpoint is `GRAPHQL_URL = "/graphql/"`.
@@ -78,3 +81,38 @@ Usage:
 
             # Add some more asserts if you like
             ...
+
+Using pytest
+------------
+
+To use pytest define a simple fixture using the query helper below
+
+.. code:: python
+
+        # Create a fixture using the graphql_query helper and `client` fixture from `pytest-django`.
+        import pytest
+        from graphene_django.utils.testing import graphql_query
+
+        @pytest.fixture
+        def client_query(client)
+            def func(*args, **kwargs):
+                return graphql_query(*args, **kwargs, client=client)
+
+            return func
+
+        # Test you query using the client_query fixture
+        def test_some_query(client_query):
+            response = graphql_query(
+                '''
+                query {
+                    myModel {
+                        id
+                        name
+                    }
+                }
+                ''',
+                op_name='myModel'
+            )
+
+            content = json.loads(response.content)
+            assert 'errors' not in content

graphene_django/tests/test_utils.py

@@ -71,3 +71,17 @@ def test_graphql_query_case_op_name(post_mock):
         "operationName",
         "QueryName",
     ) in body.items(), "Field 'operationName' is not present in the final request."
+
+
+@pytest.fixture
+def client_query(client):
+    def func(*args, **kwargs):
+        return graphql_query(*args, **kwargs, client=client)
+
+    return func
+
+
+def test_pytest_fixture_usage(client_query):
+    response = graphql_query("query { test }")
+    content = json.loads(response.content)
+    assert content == {"data": {"test": "Hello World"}}