disposable-cls/test/EventEmitterSpec.js

Provides disposable continuation local storage for Node.js.

"use strict";
var events_1 = require("events");
var chai_1 = require("chai");
var index_1 = require("../src/index");
var MockObjects_1 = require("./MockObjects");
describe("Event Emitters", function () {
    describe("in single scope block", function () {
        it("should have access to the current context items", function (done) {
            var emitter = new events_1.EventEmitter();
            index_1.using([new MockObjects_1.SimpleMockObject()], function () {
                index_1.bindEventEmitter(emitter);
                emitter.on("event", function () {
                    chai_1.expect(index_1.getCurrentObject(MockObjects_1.SimpleMockObject)).to.not.be.undefined;
                    done();
                });
            });
            setImmediate(function () { emitter.emit("event"); });
        });
        it("should have access to the emitted arguments", function (done) {
            var emitter = new events_1.EventEmitter();
            index_1.using([new MockObjects_1.SimpleMockObject()], function () {
                index_1.bindEventEmitter(emitter);
                emitter.on("event", function () {
                    var args = [];
                    for (var _i = 0; _i < arguments.length; _i++) {
                        args[_i - 0] = arguments[_i];
                    }
                    chai_1.expect(args).to.have.length(2);
                    chai_1.expect(args[0]).to.be.equal(10);
                    chai_1.expect(args[1]).to.be.equal("Hello");
                    done();
                });
            });
            setImmediate(function () { emitter.emit("event", 10, "Hello"); });
        });
        it("should not allow the captured context items to be disposed of when listener is active", function (done) {
            var wasDisposed = false;
            var doneFlag = false;
            var expectationsOnCompleteFunc = function () {
                if (doneFlag) {
                    // Expect the wasDisposed flag to remain false because even though the using block will
                    // have completed, the bound EventEmitter will still receive emitted events
                    chai_1.expect(wasDisposed).to.be.false;
                    return done();
                }
                setImmediate(expectationsOnCompleteFunc);
            };
            var emitter = new events_1.EventEmitter();
            index_1.using([new MockObjects_1.SimpleDisposableMockObject(function () { wasDisposed = true; })], function () {
                index_1.bindEventEmitter(emitter);
                emitter.on("event", function () {
                    chai_1.expect(wasDisposed).to.be.false;
                    doneFlag = true;
                });
            });
            setImmediate(expectationsOnCompleteFunc);
            setImmediate(function () { emitter.emit("event"); });
        });
        it("should dipose of the context items when the last listener is removed", function (done) {
            var wasDisposed = false;
            var doneFlag = false;
            var emitter = new events_1.EventEmitter();
            var listener = function () { doneFlag = true; };
            var expectationsOnCompleteFunc = function () {
                if (doneFlag) {
                    chai_1.expect(wasDisposed).to.be.false;
                    emitter.removeListener("event", listener);
                    // Expect the wasDisposed flag to become true because the event listener has now been removed
                    // from the EventEmitter
                    chai_1.expect(wasDisposed).to.be.true;
                    return done();
                }
                setImmediate(expectationsOnCompleteFunc);
            };
            index_1.using([new MockObjects_1.SimpleDisposableMockObject(function () { wasDisposed = true; })], function () {
                index_1.bindEventEmitter(emitter);
                emitter.on("event", listener);
            });
            setImmediate(expectationsOnCompleteFunc);
            setImmediate(function () { emitter.emit("event"); });
        });
    });
});