rx-winjs/tests/tests.events.js

Library for composing asynchronous and event-based operations in JavaScript extending the Windows WinJS library

/** Fake DOM Element */
function FakeDOMStandardElement(nodeName) {
    this.listeners = {};
    this.nodeName = nodeName
    this.addEventListenerCalled = false;
    this.removeEventListenerCalled = false;
}

FakeDOMStandardElement.prototype.addEventListener = function (eventName, handler, useCapture) {
    this.listeners[eventName] = handler;
    this.addEventListenerCalled = true;
};

FakeDOMStandardElement.prototype.removeEventListener = function (eventName, handler, useCapture) {
    delete this.listeners[eventName];
    this.removeEventListenerCalled = true;
};

FakeDOMStandardElement.prototype.trigger = function (eventName, eventData) {
    if (eventName in this.listeners) {
        this.listeners[eventName](eventData);
    }
};

test('Event_1', function () {
    var element = new FakeDOMStandardElement('foo');

    var d = Rx.WinJS.fromEvent(element, 'someEvent')
        .subscribe(function (x) {
            equal(x, 42);
        });

    element.trigger('someEvent', 42);
    equal(element.addEventListenerCalled, true);
    equal(element.removeEventListenerCalled, false);

    d.dispose();

    equal(element.removeEventListenerCalled, true);
});

test('Event_2', function () {
    var elements = [new FakeDOMStandardElement('foo')];

    var d = Rx.WinJS.fromEvent(elements, 'someEvent')
        .subscribe(function (x) {
            equal(x, 42);
        });

    elements[0].trigger('someEvent', 42);
    equal(elements[0].addEventListenerCalled, true);
    equal(elements[0].removeEventListenerCalled, false);    

    d.dispose();

    equal(elements[0].removeEventListenerCalled, true);    
});