diff --git a/tests/test_config.py b/tests/test_config.py
index 944b93d7..cd856b2b 100644
--- a/tests/test_config.py
+++ b/tests/test_config.py
@@ -113,6 +113,10 @@ def test_config_from_mapping():
     app.config.from_mapping(SECRET_KEY="config", TEST_KEY="foo")
     common_object_test(app)
 
+    app = flask.Flask(__name__)
+    app.config.from_mapping(SECRET_KEY="config", TEST_KEY="foo", skip_key="skip")
+    common_object_test(app)
+
     app = flask.Flask(__name__)
     with pytest.raises(TypeError):
         app.config.from_mapping({}, {})