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`nix-build -A fish.tests.fishConfig` will now test that the `fish_config` tool would start up properly. Previously, this test was effectively disabled due to `withTests` being stubbed out. I don't think this test ever truly worked, because the generated temporary file would be cleaned up automatically (or maybe this "automatically" changed between versions). The solution to this is to add `delete=False` to the `NamedTemporaryFile` function call, to keep the temporary file around in order to grep its contents for the expected output.