Add test for pending deprecation warning on GraphQLTestCase._client

graphene_django/utils/tests/test_testing.py

@@ -0,0 +1,24 @@
+import pytest
+
+from .. import GraphQLTestCase
+from ...tests.test_types import with_local_registry
+
+
+@with_local_registry
+def test_graphql_test_case_deprecated_client():
+    """
+    Test that `GraphQLTestCase._client`'s should raise pending deprecation warning.
+    """
+
+    class TestClass(GraphQLTestCase):
+        GRAPHQL_SCHEMA = True
+
+        def runTest(self):
+            pass
+
+    tc = TestClass()
+    tc._pre_setup()
+    tc.setUpClass()
+
+    with pytest.warns(PendingDeprecationWarning):
+        tc._client