This is no issue.
It is explained in the description and in the link.

Indeed this was intended, as pointed out in the description, a module can be defined once with the dependencies array, but can be used after without them to create other components. The test is trying to show the difference between:

angular.module('app', [])

and

angular.module('app').controller(function(){})

without overcomplicating things.

Fixed, thanks for the catch