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90125566bb
Fixes #3324 Co-authored-by: Kitson Kelly <me@kitsonkelly.com>
156 lines
4 KiB
TypeScript
156 lines
4 KiB
TypeScript
// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
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import { test, assertEquals } from "./test_util.ts";
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test(function addEventListenerTest(): void {
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const document = new EventTarget();
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// @ts-ignore tests ignoring the type system for resilience
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assertEquals(document.addEventListener("x", null, false), undefined);
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// @ts-ignore
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assertEquals(document.addEventListener("x", null, true), undefined);
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// @ts-ignore
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assertEquals(document.addEventListener("x", null), undefined);
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});
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test(function constructedEventTargetCanBeUsedAsExpected(): void {
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const target = new EventTarget();
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const event = new Event("foo", { bubbles: true, cancelable: false });
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let callCount = 0;
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const listener = (e: Event): void => {
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assertEquals(e, event);
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++callCount;
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};
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target.addEventListener("foo", listener);
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target.dispatchEvent(event);
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assertEquals(callCount, 1);
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target.dispatchEvent(event);
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assertEquals(callCount, 2);
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target.removeEventListener("foo", listener);
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target.dispatchEvent(event);
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assertEquals(callCount, 2);
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});
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test(function anEventTargetCanBeSubclassed(): void {
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class NicerEventTarget extends EventTarget {
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on(
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type: string,
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callback: (e: Event) => void | null,
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options?: __domTypes.AddEventListenerOptions
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): void {
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this.addEventListener(type, callback, options);
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}
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off(
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type: string,
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callback: (e: Event) => void | null,
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options?: __domTypes.EventListenerOptions
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): void {
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this.removeEventListener(type, callback, options);
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}
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}
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const target = new NicerEventTarget();
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new Event("foo", { bubbles: true, cancelable: false });
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let callCount = 0;
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const listener = (): void => {
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++callCount;
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};
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target.on("foo", listener);
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assertEquals(callCount, 0);
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target.off("foo", listener);
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assertEquals(callCount, 0);
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});
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test(function removingNullEventListenerShouldSucceed(): void {
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const document = new EventTarget();
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// @ts-ignore
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assertEquals(document.removeEventListener("x", null, false), undefined);
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// @ts-ignore
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assertEquals(document.removeEventListener("x", null, true), undefined);
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// @ts-ignore
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assertEquals(document.removeEventListener("x", null), undefined);
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});
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test(function constructedEventTargetUseObjectPrototype(): void {
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const target = new EventTarget();
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const event = new Event("toString", { bubbles: true, cancelable: false });
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let callCount = 0;
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const listener = (e: Event): void => {
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assertEquals(e, event);
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++callCount;
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};
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target.addEventListener("toString", listener);
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target.dispatchEvent(event);
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assertEquals(callCount, 1);
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target.dispatchEvent(event);
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assertEquals(callCount, 2);
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target.removeEventListener("toString", listener);
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target.dispatchEvent(event);
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assertEquals(callCount, 2);
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});
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test(function toStringShouldBeWebCompatible(): void {
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const target = new EventTarget();
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assertEquals(target.toString(), "[object EventTarget]");
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});
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test(function dispatchEventShouldNotThrowError(): void {
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let hasThrown = false;
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try {
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const target = new EventTarget();
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const event = new Event("hasOwnProperty", {
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bubbles: true,
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cancelable: false
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});
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const listener = (): void => {};
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target.addEventListener("hasOwnProperty", listener);
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target.dispatchEvent(event);
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} catch {
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hasThrown = true;
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}
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assertEquals(hasThrown, false);
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});
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test(function eventTargetThisShouldDefaultToWindow(): void {
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const {
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addEventListener,
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dispatchEvent,
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removeEventListener
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} = EventTarget.prototype;
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let n = 1;
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const event = new Event("hello");
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const listener = (): void => {
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n = 2;
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};
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addEventListener("hello", listener);
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window.dispatchEvent(event);
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assertEquals(n, 2);
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n = 1;
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removeEventListener("hello", listener);
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window.dispatchEvent(event);
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assertEquals(n, 1);
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window.addEventListener("hello", listener);
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dispatchEvent(event);
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assertEquals(n, 2);
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n = 1;
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window.removeEventListener("hello", listener);
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dispatchEvent(event);
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assertEquals(n, 1);
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});
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