OS: Windows 10

Steps to Reproduce:

1. Clone, install, and open vscode

git clone https://github.com/microsoft/vscode
cd vscode
scripts\npm install
code .

2. Use ctrl+b to run the build task. After it completes, terminate the task
3. Open the command palette and "Run test task"

Expected: test task runs
Actual: Error

[18:07:19] Using gulpfile c:\PATH\vscode\gulpfile.js
[18:07:19] Starting 'test'...
{ errorCode: 'load',
moduleId: 'original-fs',
neededBy: [ 'vs/code/node/windowsUtils' ],
detail:
{ Error: Cannot find module 'original-fs'
at Function.Module._resolveFilename (module.js:440:15)
at Function.Module._load (module.js:388:25)
at Module.require (module.js:468:17)
at require (internal/module.js:20:19)
at NodeScriptLoader.load (C:\PATH\vscode\out\vs\loader.js:609:39)
at OnlyOnceScriptLoader.load (C:\PATH\vscode\out\vs\loader.js:519:37)
at loadNextPath (C:\PATH\vscode\out\vs\loader.js:1279:41)
at Object.errorback (C:\PATH\vscode\out\vs\loader.js:1287:25)
at OnlyOnceScriptLoader.triggerErrorback (C:\PATH\vscode\out\vs\loader.js:532:36)
at C:\PATH\vscode\out\vs\loader.js:519:156
at ReadFileContext.callback (C:\PATH\vscode\out\vs\loader.js:622:25)
at FSReqWrap.readFileAfterOpen [as oncomplete] (fs.js:365:13) code: 'MODULE_NOT_FOUND' } }