the tox upgrade

Author: zhenwei-li

tox.ini

@@ -24,7 +24,7 @@ platform = linux: linux
 allowlist_externals =
     /bin/bash
 changedir =
-    tests
+    test
 # https://tox.readthedocs.io/en/latest/config.html#conf-deps
 deps =
     flake8