test(tox): integreate tox to CI

Author: tai271828

tasks/test.py

@@ -16,3 +16,4 @@ def run(ctx, allow_no_tests=False):
 def cov(ctx):
     """Run test covreage check"""
     ctx.run(f"{VENV_PREFIX} pytest --cov=send_mail.py,render_mail.py tests/", pty=True)
+    ctx.run(f"{VENV_PREFIX} tox, pty=True)