JavaScript Unit Testing Guru Needed

I'm in dire need of someone well-versed in Node JS, and JavaScript. Your proficiency should particularly be in unit testing. A level of mastery in using the Mocha framework would be most advantageous. I'm counting on you to ensure rigorous code coverage, specifically aiming above 80%. I expect high-quality, comprehensive tests that will assure the robustness of the code. Experience working in similar projects will be valued. Let's improve the integrity of my code base together.