Test that libtcodpy constants are correct.

Author: HexDecimal

tests/test_deprecated.py

@@ -27,6 +27,7 @@ def test_deprecate_color() -> None:
 def test_constants() -> None:
     with pytest.warns(match=r"tcod.constants.RENDERER_SDL2"):
         assert tcod.RENDERER_SDL2 is tcod.constants.RENDERER_SDL2
+    assert tcod.libtcodpy.RENDERER_SDL2 is tcod.constants.RENDERER_SDL2
 
 
 def test_implicit_libtcodpy() -> None: