pkgs/build-support/trivial-builders/test/write-shell-script.nix

   1 { lib, writeShellScript }: let
   2   output = "hello";
   3 in (writeShellScript "test-script" ''
   4   echo ${lib.escapeShellArg output}
   5 '').overrideAttrs (old: {
   6   checkPhase = old.checkPhase or "" + ''
   7     expected=${lib.escapeShellArg output}
   8     got=$("$target")
   9     if [[ "$got" != "$expected" ]]; then
  10       echo "wrong output: expected $expected, got $got"
  11       exit 1
  12     fi
  13   '';
  14 })