test for reverse mapping split

keymapper/mapping.py

@@ -33,8 +33,8 @@ from keymapper.paths import get_config_path
 def update_reverse_mapping(func):
     """Generate a reverse mapping to optimize reverse lookups.
 
-    If _mapping contains `20: "a, A"`,
-    reverse mapping will contain `"a": 20, "A": 20`
+    If _mapping contains `20: "a, A"` (the xkb syntax for modified keys),
+    reverse mapping will contain `"a": 20, "A": 20`.
     """
     def wrapper(self, *args, **kwargs):
         func(self, *args, **kwargs)

tests/testcases/mapping.py

@@ -45,6 +45,12 @@ class TestMapping(unittest.TestCase):
         self.assertEqual(loaded.get_keycode('2'), 11)
         self.assertEqual(loaded.get_keycode('3'), 12)
 
+    def test_split(self):
+        # mapping supports the xmodmap/xkb syntax for modified buttons
+        self.mapping.change(10, 'a, A')
+        self.assertEqual(self.mapping.get_keycode('a'), 10)
+        self.assertEqual(self.mapping.get_keycode('A'), 10)
+
     def test_change(self):
         # 1 is not assigned yet, ignore it
         self.mapping.change(2, 'a', 1)