See cli/mk_data/ for how this is used.
Changes to the mocks won't be picked up by the tests until they are git staged and the nix develop shell is re-evaluated. Otherwise you'll get errors like this:
❌ ERROR: path to mock data file doesn't exist: /nix/store/hdlchirs5p2cq5fvsv32j65h90hibn3p-generated/search/java_suggestions.json