How does mocha execute test files in a directory?

Question

Say there is a directory(Testcases), with.js files, some are test files with it() function and rest aren't when mocha Testcases is used, does mocha execute only the ones with it()?

Answer 1

How about trying it out? This is a simple experiment you can run in about 2 minutes.

$ mkdir test-mocha
$ cd test-mocha
$ npm init -y
$ npm i mocha chai

Testcases/a.js

console.log('test');

Testcases/b.js

var expect = require("chai").expect;

describe('Test', function() {
    it('1 equals 1', function() {
        expect(1).to.equal(1);
    });
});

And run your mocha command:

$ ./node_modules/.bin/mocha Testcases/
test


  Test #1
    ✓ 1 equals 1


  1 passing (4ms)

So the answer is no .