Mocha

Needs advice on code coverage tool in Node.js/ExpressJS with External API Testing Framework

Hello community,

I have a web application with the backend developed using Node.js and Express.js. The backend server is in one directory, and I have a separate API testing framework, made using SuperTest, Mocha, and Chai, in another directory. The testing framework pings the API, retrieves responses, and performs validations.

I'm currently looking for a code coverage tool that can accurately measure the code coverage of my backend code when triggered by the API testing framework. I've tried using Istanbul and NYC with instrumented code, but the results are not as expected.

Could you please recommend a reliable code coverage tool or suggest an approach to effectively measure the code coverage of my Node.js/Express.js backend code in this setup?

So far, I have worked on UI automation testing using the WebdriverIO+TypeScript+ Cucumber framework. Now my manager wants me to design a framework for API automation testing using TypeScript.

Could someone please suggest if it is ideal to use cucumber for API automation? If not, please provide the reasons. And also, please suggest the best npm packages, framework (Cucumber/ Mocha), API testing module - axios or SuperTest, report generation tool (Allure report or any other) that we can use for API automation testing.