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

   1 { lib, writeShellScript }:
   2 let
   3   output = "hello";
   4 in
   5 (writeShellScript "test-script" ''
   6   echo ${lib.escapeShellArg output}
   7 '').overrideAttrs
   8   (old: {
   9     checkPhase =
  10       old.checkPhase or ""
  11       + ''
  12         expected=${lib.escapeShellArg output}
  13         got=$("$target")
  14         if [[ "$got" != "$expected" ]]; then
  15           echo "wrong output: expected $expected, got $got"
  16           exit 1
  17         fi
  18       '';
  19   })