DRY up tests to remove extra tests and to make the intent more clear

A few weeks back when I was still new to Exercism and did not know that contributions are on pause, I created a PR with a sample of what I want to do for the freelancer rates exercise - just 1 function .

I have noticed that a number of tests are redundant and some of them do NOT convey the intent clearly. When the maintainers come back, I would request them to take a look at the PR and let me know if you want to proceed this way. I could send more contributions then.

DRY up tests to remove extra tests and to make the intent more clear by siraj-samsudeen · Pull Request #2028 · exercism/javascript