Tulio Mir developed a new testing capability for the HathorNetwork/hathor-core repository by implementing the --test-mode-block-weight CLI flag. This feature allows developers to run tests with a reduced block weight, streamlining development and validation processes. Tulio used Python to integrate the flag into the command-line interface, focusing on CLI development and automated testing workflows. The addition supports more efficient and reliable continuous integration by enabling faster test cycles without altering production logic. While the work was limited to a single feature over one month, it addressed a specific need for improved developer testing and contributed to the project’s overall maintainability.