panic-server/test/Client.js

/* eslint-env mocha*/
'use strict';
var Client = require('../src/Client');
var Emitter = require('events');
var Promise = require('bluebird');
var expect = require('expect');

describe('A client', function () {
	var client, socket, platform;

	beforeEach(function () {
		socket = new Emitter();

		platform = {
			name: 'Node.js',
			version: '6.6.0',
		};

		client = new Client({
			socket: socket,
			platform: platform,
		});
	});

	it('should expose the socket', function () {
		expect(client.socket).toBe(socket);
	});

	it('should expose the platform', function () {
		expect(client.platform).toBe(platform);
	});

	it('should validate the socket', function () {
		function fail () {
			return new Client({
				// Missing "socket".
				platform: platform,
			});
		}
		expect(fail).toThrow();
	});

	it('should validate the platform', function () {
		function fail () {
			return new Client({
				socket: new Emitter(),
				// Missing "platform".
			});
		}
		expect(fail).toThrow();
	});

	describe('"run" call', function () {
		var spy;

		beforeEach(function () {
			spy = expect.createSpy();
		});

		it('should send jobs to the client', function () {
			client.socket.on('run', spy);
			client.run(function () {});
			expect(spy).toHaveBeenCalled();
		});

		it('should make sure the job is a function', function () {
			function fail () {
				client.run(9000);
			}
			expect(fail).toThrow(TypeError);
		});

		it('should send the stringified job', function () {
			client.socket.on('run', spy);
			client.run(function () {
				// I haz a comment.
			});
			var str = spy.calls[0].arguments[0];
			expect(str).toContain('I haz a comment');
		});

		it('should pass a job ID', function () {
			client.socket.on('run', spy);
			client.run(function () {});
			client.run(function () {});
			var id1 = spy.calls[0].arguments[1];
			var id2 = spy.calls[1].arguments[1];
			expect(id1).toBeA('string');
			expect(id2).toBeA('string');
			expect(id1).toNotBe(id2);
		});

		it('should send the props to the client', function () {
			client.socket.on('run', spy);
			var props = {};
			client.run(function () {}, props);
			var args = spy.calls[0].arguments;
			expect(args[2]).toBe(props);
		});

		it('should return a bluebird promise', function () {
			var job = client.run(function () {});
			expect(job).toBeA(Promise);
		});

		it('should resolve when the job does', function (done) {
			client.socket.on('run', spy);
			var job = client.run(function () {});
			var jobID = spy.calls[0].arguments[1];

			job.then(done);
			client.socket.emit(jobID, {});
		});

		it('should resolve to the job value', function () {
			client.socket.on('run', spy);
			var job = client.run(function () {});

			var jobID = spy.calls[0].arguments[1];

			client.socket.emit(jobID, {
				value: 'Hello world!',
			});

			return job.then(function (value) {
				expect(value).toBe('Hello world!');
			});
		});

		it('should reject if the job fails', function (done) {
			client.socket.on('run', spy);
			var job = client.run(function () {});
			var jobID = spy.calls[0].arguments[1];
			var error = new Error('".run" rejection test.');

			job.catch(function (err) {
				expect(err).toBe(error);
				done();
			});

			client.socket.emit(jobID, {
				error: error,
			});
		});

		it('should unsubscribe once finished', function () {
			var socket = client.socket;
			socket.on('run', spy);
			client.run(function () {});
			var jobID = spy.calls[0].arguments[1];
			expect(socket.listenerCount(jobID)).toBe(1);
			socket.emit(jobID, {});
			expect(socket.listenerCount(jobID)).toBe(0);
		});

		it('should resolve if disconnected', function (done) {
			var job = client.run(function () {});
			job.then(done);
			client.socket.emit('disconnect');
		});

	});

});