Gustav Derdrache contributed to the Shopify/nixpkgs repository by expanding test coverage for Flake-based workflows in the nixos-generate-config tool. During June 2025, he developed a targeted test to verify correct configuration generation when the Flake=1 option is enabled, ensuring that the produced files align with expected outcomes. His work focused on Nix configuration and testing, leveraging the Nix language to validate the integrity of generated configurations. While no bugs were fixed in this period, the feature added depth to the project’s automated validation processes. The contribution addressed a specific need for reliable Flake support in configuration generation workflows.