anchor.diff:        groff
         gettext
       ] ++ lib.optional (!stdenv.isDarwin) man-db;
  +
  +    doCheck = true;
  +
  +    checkInputs = [
  +      coreutils
  +      (python3.withPackages(ps: [ps.pexpect]))
  +      procps
  +    ];
  +
  +    checkPhase = ''
  +      make test
  +    '';
   
       postInstall = with lib; ''
         sed -r "s|command grep|command ${gnugrep}/bin/grep|" \
  
positive.code: , python3
  , cmake
  , fishPlugins
  
  , runCommand
  , writeText
  
negative.code:       sha256 = "sha256-TwKT7Z9qa3fkfUHvq+YvMxnobvyL+DzFhzMET7xvkhE=";
      };
  
      # Fix FHS paths in tests
      postPatch = ''
        # src/fish_tests.cpp
        sed -i 's|/bin/ls|${coreutils}/bin/ls|' src/fish_tests.cpp
        sed -i 's|L"/usr"|L"/nix"|' src/fish_tests.cpp
        sed -i 's|L"/bin/echo"|L"${coreutils}/bin/echo"|' src/fish_tests.cpp
        sed -i 's|L"/bin/c"|L"${coreutils}/bin/c"|' src/fish_tests.cpp
        sed -i 's|L"/bin/ca"|L"${coreutils}/bin/ca"|' src/fish_tests.cpp
  
        # tests/checks/cd.fish
        sed -i 's|/bin/pwd|${coreutils}/bin/pwd|' tests/checks/cd.fish
  
        # tests/checks/redirect.fish
        sed -i 's|/bin/echo|${coreutils}/bin/echo|' tests/checks/redirect.fish
  
        # tests/checks/vars_as_commands.fish
        sed -i 's|/usr/bin|${coreutils}/bin|' tests/checks/vars_as_commands.fish
  
        # tests/checks/jobs.fish
        sed -i 's|ps -o stat|${procps}/bin/ps -o stat|' tests/checks/jobs.fish
        sed -i 's|/bin/echo|${coreutils}/bin/echo|' tests/checks/jobs.fish
  
        # tests/checks/job-control-noninteractive.fish
        sed -i 's|/bin/echo|${coreutils}/bin/echo|' tests/checks/job-control-noninteractive.fish
  
        # tests/checks/complete.fish
        sed -i 's|/bin/ls|${coreutils}/bin/ls|' tests/checks/complete.fish
      '' + lib.optionalString stdenv.isDarwin ''
        # Tests use pkill/pgrep which are currently not built on Darwin
        # See https://github.com/NixOS/nixpkgs/pull/103180
        rm tests/pexpects/exit.py
        rm tests/pexpects/job_summary.py
        rm tests/pexpects/signals.py
      '';
  
      nativeBuildInputs = [
        cmake
      ];
  