During July 2025, Aquatic Duck enhanced the SciTools/iris repository by developing a round-trip integration test for NetCDF calendar attributes, focusing on ensuring data integrity during save and load operations. This work involved implementing Python-based integration testing to validate that calendar attributes are preserved accurately, thereby expanding the project’s testing coverage and reducing the risk of regressions. Aquatic Duck also updated the project’s documentation, providing clearer guidance on calendar attribute handling. The approach demonstrated a solid understanding of NetCDF data structures, test-driven development, and technical writing, resulting in more reliable CI processes and improved maintainability for the codebase.