tests.overriding: refactor and allow non-bool expected value

in

stdenvNoCC.mkDerivation {

stdenvNoCC.mkDerivation (finalAttrs: {

  __structuredAttrs = true;

  name = "test-overriding";

  passthru = { inherit tests; };

  passthru = {

    inherit tests;

    failures = lib.runTests (finalAttrs.passthru.tests // { tests = lib.attrNames tests; });

  };

  testResults = lib.mapAttrs (testName: test: test.expr == test.expected) finalAttrs.passthru.tests;

  buildCommand = ''

    touch $out

    for testName in "''${!testResults[@]}"; do

      if [[ -n "''${testResults[$testName]}" ]]; then

        echo "$testName success"

      else

        echo "$testName fail"

      fi

    done

  ''

  + lib.concatMapAttrsStringSep "\n" (

    name: t:

    "([[ ${lib.boolToString t.expr} == ${lib.boolToString t.expected} ]] && echo '${name} success') || (echo '${name} fail' && exit 1)"

  ) tests;

}

  + lib.optionalString (lib.any (v: !v) (lib.attrValues finalAttrs.testResults)) ''

    {

      echo "ERROR: tests.overriding: Encountering failed tests."

      for testName in "''${!testResults[@]}"; do

        if [[ -z "''${testResults[$testName]}" ]]; then

          echo "- $testName"

        fi

      done

      echo "To inspect the expected and actual result, "

      echo '  evaluate `tests.overriding.tests.''${testName}`.'

    } >&2

    exit 1

  '';

})