message: actually use parameter
diff: @@ -71,9 +71,8 @@ export class TestAssetWorkspace {
  }
  invokeGit(args: string, workingDirectory: string) : Promise<{stdout: string, stderr: string}> {
  - let wd = this.projects[0].projectDirectoryPath;
  return new Promise((resolve, reject) => {
  - let child = cp.exec('git ' + args, {cwd: path.dirname(wd) },
  + let child = cp.exec('git ' + args, {cwd: path.dirname(workingDirectory) },
  (err, stdout, stderr) => {
  return err ? reject(err) : resolve({
  stdout: stdout,
  