Add support for pairing devices with hubs (#859)

Co-authored-by: Steven B. <51370195+sdb9696@users.noreply.github.com>

tests/conftest.py

@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import asyncio
+import os
 import sys
 import warnings
 from pathlib import Path
@@ -8,6 +9,9 @@ from unittest.mock import MagicMock, patch
 
 import pytest
 
+# TODO: this and runner fixture could be moved to tests/cli/conftest.py
+from asyncclick.testing import CliRunner
+
 from kasa import (
     DeviceConfig,
     SmartProtocol,
@@ -149,3 +153,12 @@ def mock_datagram_endpoint(request):  # noqa: PT004
             side_effect=_create_datagram_endpoint,
         ):
             yield
+
+
+@pytest.fixture
+def runner():
+    """Runner fixture that unsets the KASA_ environment variables for tests."""
+    KASA_VARS = {k: None for k, v in os.environ.items() if k.startswith("KASA_")}
+    runner = CliRunner(env=KASA_VARS)
+
+    return runner