pkgs.testVersion

The following is the current implementation of this function.

testVersion =
    {
      package,
      command ? "${package.meta.mainProgram or package.pname or package.name} --version",
      version ? package.version,
    }:
    runCommand "${package.name}-test-version"
      {
        nativeBuildInputs = [ package ];
        meta.timeout = 60;
      }
      ''
        if output=$(${command} 2>&1 | sed -e 's|${builtins.storeDir}/[^/ ]*/|{{storeDir}}/|g'); then
          if grep -Fw -- "${version}" - <<< "$output"; then
            touch $out
          else
            echo "Version string '${version}' not found!" >&2
            echo "The output was:" >&2
            echo "$output" >&2
            exit 1
          fi
        else
          echo -n ${lib.escapeShellArg command} >&2
          echo " returned a non-zero exit code." >&2
          echo "$output" >&2
          exit 1
        fi
      '';