node http api testing specs

apiSpec.js

var assert = require('assert');
var sinon = require('sinon');
var PassThrough = require('stream').PassThrough;
var http = require('http');

var api = require('../api.js');

describe('api', function() {
	beforeEach(function() {
		this.request = sinon.stub(http, 'request');
	});

	afterEach(function() {
		http.request.restore();
	});

	it('should convert get result to object', function(done) {
		var expected = { hello: 'world' };
		var response = new PassThrough();
		response.write(JSON.stringify(expected));
		response.end();

		this.request.callsArgWith(1, response)
		            .returns(new PassThrough());

		api.get(function(err, result) {
			assert.deepEqual(result, expected);
			done();
		});
	});

	it('should send post params in request body', function() {
		var params = { foo: 'bar' };
		var expected = JSON.stringify(params);

		var request = new PassThrough();
		var write = sinon.spy(request, 'write');

		this.request.returns(request);

		api.post(params, function() { });
		assert(write.withArgs(expected).calledOnce);
	});

	it('should pass request error to callback', function(done) {
		var expected = 'some error';
		var request = new PassThrough();

		this.request.returns(request);

		api.get(function(err, result) {
			assert.equal(err, expected);
			done();
		});

		request.emit('error', expected);
	});
});