nix-test-runner 0.4.3

Cli for running nix expression tests
Documentation 
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{ testFile, lib ? (import <nixpkgs> { }).lib }:
with builtins;
let
  tests = import testFile;
  testNames = map (t: { passedTest = t; }) (attrNames tests);
  failed = map (t: {
    failedTest = t.name;
    expected = prettyVal t.expected;
    result = prettyVal t.result;
  }) (lib.debug.runTests tests);
  failedTests = map (f: f.failedTest) failed;
  passed = filter (t: !lib.elem t.passedTest failedTests) testNames;
  result = { inherit passed failed; };
  prettyVal = let
    modify = v:
      let
        pr = f: {
          __pretty = f;
          val = v;
        };
      in if lib.isDerivation v then
        pr (drv: "<δ:${drv.name}:${concatStringsSep "," (attrNames drv)}>")
      else if [ ] == v then
        pr (const "[]")
      else if lib.isList v then
        pr (l: "[ ${toString (map go l)} ]")
      else if lib.isAttrs v then
        pr (a:
          "{ ${
            concatStringsSep " "
            (lib.attrValues (lib.mapAttrs (n: v: "${n} = ${go v};") v))
          } }")
      else
        v;
    go = x: lib.generators.toPretty { allowPrettyValues = true; } (modify x);
  in go;
in result