I don't understand what the node env is.

````
  1) context test compiled modules:
     Uncaught Error: ENOENT, no such file or directory '/work/traceur-compiler/60d5985e-5de6-4d4c-b3ef-811149a70290.js'
      at Object.fs.openSync (fs.js:338:18)
      at Object.fs.readFileSync (fs.js:182:15)
      at executeFile (/work/traceur-compiler/test/unit/node/generated-code-dependencies.js:44:21)
      at executeFileWithRuntime (/work/traceur-compiler/test/unit/node/generated-code-dependencies.js:38:12)
      at /work/traceur-compiler/test/unit/node/generated-code-dependencies.js:85:24
      at ChildProcess.exithandler (child_process.js:534:7)
      at ChildProcess.EventEmitter.emit (events.js:91:17)
      at maybeClose (child_process.js:634:16)
      at Socket.ChildProcess.spawn.stdin (child_process.js:805:11)
      at Socket.EventEmitter.emit (events.js:88:17)
      at Socket._destroy.destroyed (net.js:364:10)
      at process.startup.processNextTick.process._tickCallback (node.js:244:9)

  2) modules.js LoaderEvalLoadWithSubdir:
     Uncaught ReferenceError: console is not defined
      at $Greeter.sayHi (/work/traceur-compiler/60d5985e-5de6-4d4c-b3ef-811149a70290.js:622:7)
      at /work/traceur-compiler/60d5985e-5de6-4d4c-b3ef-811149a70290.js:628:9
      at executeFile (/work/traceur-compiler/test/unit/node/generated-code-dependencies.js:53:8)
      at executeFileWithRuntime (/work/traceur-compiler/test/unit/node/generated-code-dependencies.js:38:12)
      at /work/traceur-compiler/test/unit/node/generated-code-dependencies.js:85:24
      at ChildProcess.exithandler (child_process.js:534:7)
      at ChildProcess.EventEmitter.emit (events.js:91:17)
      at maybeClose (child_process.js:634:16)
      at Process._handle.onexit (child_process.js:676:5)
````