FAQ: Automate and Organize Tests - Install Mocha II

This community-built FAQ covers the “Install Mocha II” exercise from the lesson “Automate and Organize Tests”.

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This exercise can be found in the following Codecademy content:

Web Development

Learn JavaScript Unit Testing

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I am practising running tests on my own computer in VS Code with Mocha. I’ve been following the instructions from this lesson and have successfully installed Mocha, have set the value of “test” in the “scripts” object to “mocha”, and if I type “npm test”, the test suite runs as long as the file containing the test code is called test.js.
However, this lesson earlier stated that it’s best to associate test code with implementation code, with a naming structure such as index.js and index-test.js
If I name the files as such and try to run tests by typing “npm test”, “npm index-test” or “npm index-test.js” the tests don’t work.
So my questions are - am I doing something wrong? Or do I HAVE to name my test file “test.js” in order for the tests to work? In which case, how do I organise a folder structure for a project with multiple JS files which all need tests - do I just have one test.js file and import code from all implementation files and do all tests in one file? Or do I have one test file per implementation file and name them all “test.js” and just store them in separate folders? That seems a little overkill.
Thanks in advance for any help! Let me know if any parts of my question need clarifying.

I think I have found the answer with the help of this website:

I can have a folder named “test” and within that I have whatever test files I want, e.g. index-test.js
If I then run npm test, it works.