Contributed to the celestiaorg/celestia-node repository by expanding test coverage for the extendBlock function, focusing on validating its behavior across various block heights and application versions. This work involved implementing and stabilizing new test cases in Go to ensure the robustness of extendBlock under diverse scenarios, directly supporting regression safety and more reliable releases. Collaborated on a test suite fix to prevent regressions, emphasizing thorough testing practices within blockchain development. The approach centered on enhancing code quality through targeted testing, leveraging Go programming and blockchain expertise to accelerate development cycles and maintain high standards for future iterations of the project.