This looks great! Nice work.

Needs to have one or more tests that covers a case like ['/test/dir/t.js', '/dir/test/t.js'].

I belive a case like this is sometimes generated randomly, sometimes not.

Can someone help me understand why I am getting this error?

TypeError: Object has no method 'repeat'
at a
at Object.Test.it
at Test.describe.n
at Object.Test.describe

    at Object.<anonymous>

Consider the possibility that you are declaring your counter variable in the global scope and thus, it is incrementing everytime the function is invoked, even when a new parameter is passed in.

"closed" should be 'close' in description

Grammar in description.

The instructions could be much more clear.

Given a minimum and maximum value, return a random number that falls with in that range.