Ole Streicher improved test reliability in the astropy/astropy repository by addressing issues with tests that require remote data. He implemented logic in Python to ensure that tests dependent on network connectivity only execute when such connectivity is available, reducing build failures in offline CI environments. By grouping tests related to future or uncovered time ranges under a unified offline-safe approach, Ole streamlined test maintenance and enhanced CI/CD stability. His work leveraged Python testing practices and pytest markers, centralizing the handling of offline data scenarios. This targeted bug fix improved the maintainability and robustness of the repository’s automated testing suite.