Worked on the aio-libs/aiohttp repository to enhance test configuration by introducing a configurable host parameter to the aiohttp_server fixture. This feature allows tests to bind the server to a specified host, while maintaining backward compatibility with the default 127.0.0.1 setting. The implementation, developed in Python using asyncio and fixture development techniques, aimed to reduce environmental flakiness and increase the flexibility of testing scenarios. By enabling explicit host binding, the work improved test determinism and paved the way for future host-based integration tests, strengthening the overall reliability and adaptability of the project’s testing infrastructure without disrupting existing workflows.