fix(tests): adding WSL2 support (#600)

Developers using WSL2 (Windows Subsystem for Linux) face the problem
that there is currently no systemd support. For the test `test_iptables`
a service is started and it fails on WSL2 hosts.

This commit introduces a pytest marker to skip the test if the host is
executing on WSL2.

Author: dariuszparys

test/conftest.py

@@ -264,3 +264,7 @@ def build_image(build_failed, dockerfile, image, image_path):
         "markers",
         "destructive: mark test as destructive"
     )
+    config.addinivalue_line(
+        "markers",
+        "skip_wsl: skip test on WSL, no systemd support"
+    )

test/test_modules.py

@@ -12,11 +12,11 @@
 
 import crypt
 import datetime
+import os
+import pytest
 import re
 import time
 
-import pytest
-
 from ipaddress import ip_address
 from ipaddress import IPv4Address
 from ipaddress import IPv6Address
@@ -516,6 +516,8 @@ def test_environment_home(host):
     assert host.environment().get('HOME') == '/root'
 
 
+@pytest.mark.skipif('WSL_DISTRO_NAME' in os.environ,
+                    reason="Skip on WSL (Windows Subsystem for Linux)")
 def test_iptables(host):
     cmd = host.run("systemctl start netfilter-persistent")
     assert cmd.exit_status == 0, f"{cmd.stdout}\n{cmd.stderr}"

tox.ini

@@ -12,7 +12,7 @@ deps=
 commands=
     {envpython} -m pytest {posargs:-v -n 4 --cov testinfra --cov-report xml --cov-report term test}
 usedevelop=True
-passenv=HOME TRAVIS DOCKER_CERT_PATH DOCKER_HOST DOCKER_TLS_VERIFY
+passenv=HOME TRAVIS DOCKER_CERT_PATH DOCKER_HOST DOCKER_TLS_VERIFY WSL_DISTRO_NAME
 
 [testenv:lint]
 description = Performs linting tasks