如何在Node.js中处理Mocha测试的结果？

Question

I have a simple Mocha file:

const assert = require('assert');

describe('Array', function () {
  describe('#indexOf()', function () {
    it('should return -1 when the value is not present', function () {
      assert.equal([1, 2, 3].indexOf(4), -1);
    });
  });
});

I'm looking to run the test above inside Node.js and get access to the test results for further manipulation.

I know it's possible to import Mocha and run tests, like this:

const Mocha = require('mocha');

const test = new Mocha();
test.addFile('./assert.js');
test.run();

But, I'd like a way of getting the result of assert.equal and the corresponding descriptions, perhaps via the then() method. Any ideas? Could Sinon.JS help?

The end goal is to display these tests in the browser, using an API endpoint.

Answer 1

You can use the instance of test and look for events for each test execution.

for example:

const Mocha = require('mocha');

const test = new Mocha();
test.addFile('./assert.js');
let runner = test.run();

runner.on('pass', (e) => {
    passed.push({
        title: e.title,
        speed: e.speed,
        duration: e.duration,
        file: e.file
    });
});

runner.on('fail', (e) => {
    failed.push({
        title: e.title,
        err: error,
        file: e.file
    });
});