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c84532b6d5
Co-authored-by: David Sherret <dsherret@gmail.com>
246 lines
6.2 KiB
TypeScript
246 lines
6.2 KiB
TypeScript
// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
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// deno-lint-ignore-file no-window-prefix
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import { assertEquals, unitTest } from "./test_util.ts";
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unitTest(function addEventListenerTest() {
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const document = new EventTarget();
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assertEquals(document.addEventListener("x", null, false), undefined);
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assertEquals(document.addEventListener("x", null, true), undefined);
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assertEquals(document.addEventListener("x", null), undefined);
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});
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unitTest(function constructedEventTargetCanBeUsedAsExpected() {
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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) => {
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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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unitTest(function anEventTargetCanBeSubclassed() {
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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?: AddEventListenerOptions,
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) {
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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?: EventListenerOptions,
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) {
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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 = () => {
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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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unitTest(function removingNullEventListenerShouldSucceed() {
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const document = new EventTarget();
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assertEquals(document.removeEventListener("x", null, false), undefined);
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assertEquals(document.removeEventListener("x", null, true), undefined);
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assertEquals(document.removeEventListener("x", null), undefined);
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});
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unitTest(function constructedEventTargetUseObjectPrototype() {
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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) => {
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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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unitTest(function toStringShouldBeWebCompatible() {
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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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unitTest(function dispatchEventShouldNotThrowError() {
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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 = () => {};
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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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unitTest(function eventTargetThisShouldDefaultToWindow() {
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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 = () => {
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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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unitTest(function eventTargetShouldAcceptEventListenerObject() {
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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 = {
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handleEvent(e: Event) {
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assertEquals(e, event);
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++callCount;
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},
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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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unitTest(function eventTargetShouldAcceptAsyncFunction() {
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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) => {
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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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unitTest(
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function eventTargetShouldAcceptAsyncFunctionForEventListenerObject() {
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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 = {
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handleEvent(e: Event) {
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assertEquals(e, event);
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++callCount;
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},
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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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);
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unitTest(function eventTargetDispatchShouldSetTargetNoListener() {
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const target = new EventTarget();
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const event = new Event("foo");
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assertEquals(event.target, null);
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target.dispatchEvent(event);
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assertEquals(event.target, target);
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});
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unitTest(function eventTargetDispatchShouldSetTargetInListener() {
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const target = new EventTarget();
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const event = new Event("foo");
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assertEquals(event.target, null);
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let called = false;
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target.addEventListener("foo", (e) => {
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assertEquals(e.target, target);
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called = true;
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});
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target.dispatchEvent(event);
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assertEquals(called, true);
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});
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