Testing for components in backend of MERN stack

We need backend testing for our newly developed MERN stack web app regarding the following points: 1. login 2. sign up (with e-mail verification) 3. social authentication 4. password reset (with e-mail verification) 5. Connection to MongoDB The testing should be done with Mocha and Chai, if possible The code will be backend code will be made available to you upon request. Also we want to have some script or so we can just call during CI for making sure that the tests do not fail. Important: Since the description here is very clear, we do not accept renegotations of price. You make a bid, that is okay, but we do not accept if you extend your payment expectation beyond your bid in the proposal.