diff --git a/tests/unit/config/test_style.py b/tests/unit/config/test_style.py
index 88385145c..c113a7716 100644
--- a/tests/unit/config/test_style.py
+++ b/tests/unit/config/test_style.py
@@ -82,10 +82,14 @@ class TestColorDict:
 
     @pytest.mark.parametrize('key, expected', [
         ('foo', 'one'),
+        ('foo.fg', 'two'),
+        ('foo.bg', 'three'),
     ])
     def test_values(self, key, expected):
         d = style.ColorDict()
         d['foo'] = 'one'
+        d['foo.fg'] = 'two'
+        d['foo.bg'] = 'three'
         assert d[key] == expected
 
     def test_key_error(self, caplog):