test: add tests

tox.ini

@@ -0,0 +1,16 @@
+[tox]
+env_list =
+    py311
+    py310
+    py39
+    py38
+minversion = 4.11.3
+
+[testenv]
+description = run the tests with pytest
+package = wheel
+wheel_build_env = .pkg
+deps =
+    pytest==7.4.3
+commands =
+    pytest {tty:--color=yes} {posargs}