Worked on enhancing test coverage for the CompoundIdentifier module in the ersilia-os/ersilia repository, focusing on improving reliability in chemical data parsing. Developed and integrated new unit tests using Python and PyTest, specifically targeting SMILES handling when the Chem library is unavailable and refining the guess_type logic based on InChIKey identification. This approach addressed edge cases that could lead to misclassification, thereby reducing risk in downstream data pipelines. The work emphasized robust testing practices and chemical informatics concepts, resulting in improved data integrity and readiness for analytics. No bugs were fixed, as the primary focus was on feature-level test enhancements.