tests(usergroups): add unit tests against user groups module

tests/test_utils_user_groups.py

@@ -0,0 +1,66 @@
+#! python3  # noqa E265
+
+"""
+    Usage from the repo root folder:
+
+    .. code-block:: bash
+        # for whole tests
+        python -m unittest tests.test_user_groups
+        # for specific test
+        python -m unittest tests.test_user_groups.TestUtilsUserGroups.test_win32_getenv
+"""
+
+# standard library
+import unittest
+from getpass import getuser
+from sys import platform as opersys
+
+# project
+from qgis_deployment_toolbelt.utils.user_groups import (
+    _is_computer_in_domain_powershell,
+    _is_computer_in_domain_pyad,
+    _is_computer_in_domain_win32,
+    get_user_local_groups,
+    is_computer_attached_to_a_domain,
+    is_user_in_group,
+)
+
+# ############################################################################
+# ########## Classes #############
+# ################################
+
+
+class TestUtilsUserGroups(unittest.TestCase):
+    """Test package utilities."""
+
+    def test_computer_attached_to_domain(self):
+        """Test if the computer belongs to a domain."""
+        # for now, domain link is only supported on Windows
+        if opersys != "win32":
+            self.assertFalse(is_computer_attached_to_a_domain())
+
+        # test different methods on Windows but for now, no domain mocked in tests
+        # TODO: mock domain link
+        domain_status = is_computer_attached_to_a_domain()
+        self.assertIsInstance(domain_status, bool)
+
+        self.assertEqual(domain_status, _is_computer_in_domain_powershell())
+        self.assertEqual(domain_status, _is_computer_in_domain_pyad())
+        self.assertEqual(domain_status, _is_computer_in_domain_win32())
+
+    def test_user_in_group(self):
+        """Test function determining user's groups."""
+        user_groups = get_user_local_groups()
+
+        # test with existing group
+        self.assertTrue(is_user_in_group(user_groups[0]))
+
+        # test with unisting group
+        self.assertFalse(is_user_in_group(group_name="fake_group", user_name=getuser()))
+
+
+# ############################################################################
+# ####### Stand-alone run ########
+# ################################
+if __name__ == "__main__":
+    unittest.main()