added tests

tests/test_keys.py

@@ -0,0 +1,47 @@
+import pytest
+
+from textual.app import App
+from textual.keys import _character_to_key
+
+
+@pytest.mark.parametrize(
+    "character,key",
+    [
+        ("1", "1"),
+        ("2", "2"),
+        ("a", "a"),
+        ("z", "z"),
+        ("_", "underscore"),
+        (" ", "space"),
+        ("~", "tilde"),
+        ("?", "question_mark"),
+        ("£", "pound_sign"),
+        (",", "comma"),
+    ],
+)
+def test_character_to_key(character: str, key: str) -> None:
+    assert _character_to_key(character) == key
+
+
+async def test_character_bindings():
+    """Test you can bind to a character as well as a longer key name."""
+    counter = 0
+
+    class BindApp(App):
+        BINDINGS = [(".,~,space", "increment", "foo")]
+
+        def action_increment(self) -> None:
+            nonlocal counter
+            counter += 1
+
+    app = BindApp()
+    print(app._bindings)
+    async with app.run_test() as pilot:
+        await pilot.press(".")
+        assert counter == 1
+        await pilot.press("~")
+        assert counter == 2
+        await pilot.press(" ")
+        assert counter == 3
+        await pilot.press("x")
+        assert counter == 3