Running Grunt default task produces error when it runs QUnit task

[achinaou]

When I run grunt, the default task execution begins and in the qunit task it fails.

This is the output:

Running "jshint:files" (jshint) task
>> 3 files lint free.

Running "qunit:index" (qunit) task
Testing test/index.html 
Warning: PhantomJS timed out, possibly due to a missing QUnit start() call. Use --force to continue.

Aborted due to warnings.

To reproduce:

1. Clone the repository
2. Run npm install
3. Run grunt