Example of test to the first example of code in https://visionmedia.github.io/superagent/

superagent-example.spec.ts

import { expect } from 'chai';
import { stub, match } from 'sinon';
import request = require('superagent');
import { superagentExample } from '../src/superagent-example';

describe('superAgentExample()', () => {
	let requestResult: request.SuperAgentRequest;

  beforeEach(() => {
		requestResult = Promise.resolve({ body: 'expected body' }) as any;
		requestResult.send = stub().returns(requestResult);
		requestResult.set = stub().returns(requestResult);
		stub(request, 'post').returns(requestResult);
		stub(console, 'log');
	});

	it('should run request and log result', async () => {
		const result = await superagentExample();

		expect(request.post).to.have.been.calledOnceWithExactly('/api/pet');
		expect(requestResult.send).to.have.been.calledOnceWithExactly(match.object);
		expect(requestResult.set).to.have.been.calledTwice
			.calledWithExactly('X-API-Key', 'foobar')
			.calledWithExactly('Accept', 'application/json');
		expect(console.log).to.have.been.calledOnceWithExactly('yay got "expected body"');
		expect(result).to.be.undefined;
	});
});