refactor molecule tests for python

molecule/centos7/converge.yml

@@ -1,9 +1,7 @@
 ---
 - name: Converge
   hosts: all
-  vars:
-    certbot_packages_extra:
-      - epel-release
 
   roles:
+    - role: xoxys.python3
     - role: xoxys.certbot

molecule/centos7/requirements.yml

@@ -0,0 +1,5 @@
+---
+- src: https://gitea.rknet.org/ansible/xoxys.python3.git
+  name: xoxys.python3
+  scm: git
+  version: master

molecule/centos7/tests/test_default.py

@@ -10,5 +10,11 @@ testinfra_hosts = testinfra.utils.ansible_runner.AnsibleRunner(
 
 
 def test_certbot_is_installed(host):
-    certbot = host.package("certbot")
-    assert certbot.is_installed
+    pkg = host.pip_package.get_packages(pip_path="pip3")
+    assert "certbot" in pkg
+
+
+def test_certbot_run(host):
+    cmd = host.run("certbot --help")
+    assert "Certbot can obtain and install HTTPS/TLS/SSL certificates." in cmd.stdout
+    assert cmd.succeeded