Easy way to add Mocha + Chai + Sinon to Unit Test JavaScript
Run:
npm i -D mocha chai sinon @types/mocha @types/sinon-chai
mocha, chai, sinon are the dependencies needed to run the tests, use bdd-style assertions and create test doubles (spies, mocks), respectively.
The @types/mocha and @types/sinon-chai is to help your IDE (e.g. WebStorm) recognize the methods of the libs.
Now create a file, say <your-project-root>/src/filterFilesWithExtensions.test.js:
const expect = require('chai').expect;
const filterFilesWithExtensions = require('./filterFilesWithExtensions');
describe('filterFilesWithExtensions', function () {
it('should return files with given extensions', function () {
const changeset = ['src/main/a/b/c/Main.java', 'src/main/a/b/c/Dockerfile', 'src/main/a/b/c/Main.js','src/abc.java'];
const extensions = ['java', 'js'];
expect(filterFilesWithExtensions(changeset, extensions)).to.deep.equal([
'src/main/a/b/c/Main.java', 'src/main/a/b/c/Main.js', 'src/abc.java'
]);
});
});
To run it, I suggest adding a script to your package.json:
"scripts": {
"start": ...,
"test": "mocha src/**/*.test.js"
},
And using it like:
npm test
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