Developed targeted test coverage for the Dict data structure with custom hashers in the modular/modular repository, focusing on validating custom hashing behavior, string representation, and callability. Leveraged skills in data structures, software development, and testing to implement a dedicated test case that addressed edge-case scenarios and closed a tracked issue. The approach emphasized test-driven development and integration with the existing CI pipeline, using Mojo as the primary language. This work enhanced the reliability of the test suite, reduced the risk of regressions related to hashing semantics, and contributed to improved maintainability and user confidence in the library’s stability.