Added missing test cases and a test template for perfect-numbers

Programming Ruby
1

I got a go-ahead here from @Meatball

PR is here.

I noticed that there are much fewer tests in the exercise compared to the problem specification, so I wanted to bring them up to date.

2

Please also (I will do it this time) link to the forum from the pull request as well, to make the communication complete.

3

Sorry! Will remember next time.

4

I saw it’s been merged. Thanks!

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