anchor.diff:    # Show some output while running tests, so we might notice what's wrong
     testTarget = "--show-details=streaming";
   
  -  testHaskellDepends = [ base hlint ];
  +  testHaskellDepends = [
  +    aeson base bytestring containers exceptions ghcjs-dom hlint hspec
  +    http-types HUnit jsaddle jsaddle-warp linux-namespaces process
  +    random reflex silently temporary text unix wai wai-websockets warp
  +    webdriver websockets
  +  ];
     description = "Functional Reactive Web Apps with Reflex";
     license = stdenv.lib.licenses.bsd3;
   })
  
positive.code:     aeson base bifunctors bimap blaze-builder bytestring constraints
      containers contravariant data-default dependent-map dependent-sum
      dependent-sum-template directory exception-transformers ghcjs-dom
      jsaddle keycode lens monad-control mtl primitive ref-tf
      reflex semigroups stm template-haskell text these transformers
      unix zenc network-uri
    ] ++ (if ghc.isGhcjs or false then [
      hashable
    ] else []);
  
negative.code: { mkDerivation, ghc, aeson, base, bifunctors, bimap, blaze-builder
  , bytestring, constraints, containers, contravariant, data-default
  , dependent-map, dependent-sum, dependent-sum-template, directory
  , exception-transformers, exceptions, ghcjs-dom, hlint, hspec
  , http-types, HUnit, jsaddle, jsaddle-warp, keycode, lens
  , linux-namespaces, monad-control, mtl, network-uri, primitive
  , process, random, ref-tf, reflex, semigroups, silently, stdenv
  , stm, template-haskell, temporary, text, these, transformers, unix
  , wai, wai-websockets, warp, webdriver, websockets, zenc
  , iproute, chromium, hashable
  }:
  let addGcTestDepends = drv: if stdenv.system != "x86_64-linux" then drv else drv // {
        testHaskellDepends = (drv.testHaskellDepends or []) ++ [ temporary jsaddle-warp process linux-namespaces ];
  