test_EventEmitter.js

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"use strict";

let { EventEmitter } = ChromeUtils.importESModule(

  "resource:///modules/syncedtabs/EventEmitter.sys.mjs"

);

add_task(async function testSingleListener() {

  let eventEmitter = new EventEmitter();

  let spy = sinon.spy();

  eventEmitter.on("click", spy);

  eventEmitter.emit("click", "foo", "bar");

  Assert.ok(spy.calledOnce);

  Assert.ok(spy.calledWith("foo", "bar"));

  eventEmitter.off("click", spy);

  eventEmitter.emit("click");

  Assert.ok(spy.calledOnce);

});

add_task(async function testMultipleListeners() {

  let eventEmitter = new EventEmitter();

  let spy1 = sinon.spy();

  let spy2 = sinon.spy();

  eventEmitter.on("some_event", spy1);

  eventEmitter.on("some_event", spy2);

  eventEmitter.emit("some_event");

  Assert.ok(spy1.calledOnce);

  Assert.ok(spy2.calledOnce);

  eventEmitter.off("some_event", spy1);

  eventEmitter.emit("some_event");

  Assert.ok(spy1.calledOnce);

  Assert.ok(spy2.calledTwice);

});