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66 lines
1.8 KiB
TypeScript
66 lines
1.8 KiB
TypeScript
// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
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import { test, assertEqual } from "./test_util.ts";
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test(function addEventListenerTest() {
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const document = new EventTarget();
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assertEqual(document.addEventListener("x", null, false), undefined);
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assertEqual(document.addEventListener("x", null, true), undefined);
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assertEqual(document.addEventListener("x", null), undefined);
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});
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test(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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function listener(e) {
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assertEqual(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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assertEqual(callCount, 1);
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target.dispatchEvent(event);
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assertEqual(callCount, 2);
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target.removeEventListener("foo", listener);
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target.dispatchEvent(event);
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assertEqual(callCount, 2);
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});
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test(function anEventTargetCanBeSubclassed() {
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class NicerEventTarget extends EventTarget {
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on(type, callback?, options?) {
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this.addEventListener(type, callback, options);
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}
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off(type, callback?, options?) {
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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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const event = new Event("foo", { bubbles: true, cancelable: false });
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let callCount = 0;
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function listener() {
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++callCount;
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}
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target.on("foo", listener);
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assertEqual(callCount, 0);
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target.off("foo", listener);
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assertEqual(callCount, 0);
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});
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test(function removingNullEventListenerShouldSucceed() {
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const document = new EventTarget();
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assertEqual(document.removeEventListener("x", null, false), undefined);
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assertEqual(document.removeEventListener("x", null, true), undefined);
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assertEqual(document.removeEventListener("x", null), undefined);
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});
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