anonymous-example.spec.ts

import { expect } from 'chai';
import { stub, match } from 'sinon';
import { anonymousExample } from '../src/anonymous-example';

describe('anonymousExample()', () => {
	beforeEach(() => {
		stub(console, 'log');
	});

	it('should log first v when v is 1', () => {
		const callbacker = stub().callsFake(cb => cb(1));

		const result = anonymousExample(callbacker);

		expect(callbacker).to.have.been.calledOnceWithExactly(match.func);
		expect(console.log).to.have.been.calledOnceWithExactly('first v!');
	});

	it('should log another v when v is not 1', () => {
		const callbacker = stub().callsFake(cb => cb('anything else'));

		const result = anonymousExample(callbacker);

		expect(callbacker).to.have.been.calledOnceWithExactly(match.func);
		expect(console.log).to.have.been.calledOnceWithExactly('another v!');
	});
});