Worked on stabilizing the testing environment for the foundry-rs/book repository by addressing a persistent issue with test contract and sender addresses. Focused on smart contract development and testing, the work involved updating the outdated test contract address and aligning the sender address with current test fixtures. This targeted fix eliminated a source of flaky test failures, ensuring that deployments and permissions accurately reflected intended test scenarios. By improving the reliability of continuous integration workflows, the changes enhanced overall test confidence. The work was carried out using Markdown for documentation and emphasized careful attention to detail in maintaining robust testing infrastructure.