fixup! Migrate to respx from pytest_httpx and add override tests

Author: zyv

tests/test_client.py

@@ -1,5 +1,6 @@
 import json
 from datetime import UTC, datetime
+from http import HTTPMethod
 from unittest.mock import MagicMock
 
 import httpx
@@ -86,7 +87,7 @@ def test_import_issue(api_client: ApiClient, respx_mock: respx.mock):
     import_request = get_fixture("request-start-issue-import.json")
 
     respx_mock.route(
-        method="POST",
+        method=HTTPMethod.POST,
         url="https://api.github.com/repos/owner/repository/import/issues",
         headers={"Authorization": f"Token {GITHUB_TOKEN}"} | HttpClient.HEADERS,
     ).mock(return_value=httpx.Response(httpx.codes.ACCEPTED, text=import_response))