New project tests are flaky - inconsistent results

[jasonjoh]

When doing:

npm run test

The last 3 tests are very inconsistent. Sometimes all three assert on creates expected files. Sometimes only the last one, and sometimes they all go through. It even changes which file it says isn't there. After digging in the temp directory, all the files are actually there!

I believe this is due to how done is called in the helpers.run. On the consistent tests, it is done like:

helpers.run(path.join(__dirname, '../app')).withPrompts(answers).on('end', done);

Where in the inconsistent ones, it is like:

helpers.run(path.join(__dirname, '../app')).withArguments(argument).withPrompts(answers);
done();

I believe that the run method is async, so done is being called before it is really done, causing timing issues.

There are also some errors in the later tests with which file it is expecting.