tuple lookups not supported

Author: timgraham

django_mongodb/features.py

@@ -611,6 +611,9 @@ def django_test_expected_failures(self):
             "foreign_object.tests.MultiColumnFKTests",
             "foreign_object.tests.TestExtraJoinFilterQ",
         },
+        "Tuple lookups are not supported.": {
+            "foreign_object.test_tuple_lookups.TupleLookupsTests",
+        },
         "Custom lookups are not supported.": {
             "custom_lookups.tests.BilateralTransformTests",
             "custom_lookups.tests.LookupTests.test_basic_lookup",