converse.js/spec/eventemitter.js

/*global mock */

describe("The _converse Event Emitter", function() {

    it("allows you to subscribe to emitted events", mock.initConverse((done, _converse) => {
        this.callback = function () {};
        spyOn(this, 'callback');
        _converse.on('connected', this.callback);
        _converse.api.trigger('connected');
        expect(this.callback).toHaveBeenCalled();
        _converse.api.trigger('connected');
        expect(this.callback.calls.count(), 2);
        _converse.api.trigger('connected');
        expect(this.callback.calls.count(), 3);
        done();
    }));

    it("allows you to listen once for an emitted event", mock.initConverse((done, _converse) => {
        this.callback = function () {};
        spyOn(this, 'callback');
        _converse.once('connected', this.callback);
        _converse.api.trigger('connected');
        expect(this.callback).toHaveBeenCalled();
        _converse.api.trigger('connected');
        expect(this.callback.calls.count(), 1);
        _converse.api.trigger('connected');
        expect(this.callback.calls.count(), 1);
        done();
    }));

    it("allows you to stop listening or subscribing to an event", mock.initConverse((done, _converse) => {
        this.callback = function () {};
        this.anotherCallback = function () {};
        this.neverCalled = function () {};

        spyOn(this, 'callback');
        spyOn(this, 'anotherCallback');
        spyOn(this, 'neverCalled');
        _converse.on('connected', this.callback);
        _converse.on('connected', this.anotherCallback);

        _converse.api.trigger('connected');
        expect(this.callback).toHaveBeenCalled();
        expect(this.anotherCallback).toHaveBeenCalled();

        _converse.off('connected', this.callback);

        _converse.api.trigger('connected');
        expect(this.callback.calls.count(), 1);
        expect(this.anotherCallback.calls.count(), 2);

        _converse.once('connected', this.neverCalled);
        _converse.off('connected', this.neverCalled);

        _converse.api.trigger('connected');
        expect(this.callback.calls.count(), 1);
        expect(this.anotherCallback.calls.count(), 3);
        expect(this.neverCalled).not.toHaveBeenCalled();
        done();
    }));
});