keysyms: Introduce tests for this package

tests/test_keysyms/test_keysymdef.py

@@ -0,0 +1,9 @@
+from keysyms import keysymdef
+
+
+def test_keysymdef():
+    key_mapping = keysymdef.key_symbols
+
+    assert key_mapping["0"] == 48
+    assert key_mapping["A"] == 65
+    assert key_mapping["a"] == 97