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// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
import { test, assertEquals } from "./test_util.ts";
test(function addEventListenerTest(): void {
const document = new EventTarget();
assertEquals(document.addEventListener("x", null, false), undefined);
assertEquals(document.addEventListener("x", null, true), undefined);
assertEquals(document.addEventListener("x", null), undefined);
});
test(function constructedEventTargetCanBeUsedAsExpected(): void {
const target = new EventTarget();
const event = new Event("foo", { bubbles: true, cancelable: false });
let callCount = 0;
const listener = (e): void => {
assertEquals(e, event);
++callCount;
};
target.addEventListener("foo", listener);
target.dispatchEvent(event);
assertEquals(callCount, 1);
target.dispatchEvent(event);
assertEquals(callCount, 2);
target.removeEventListener("foo", listener);
target.dispatchEvent(event);
assertEquals(callCount, 2);
});
test(function anEventTargetCanBeSubclassed(): void {
class NicerEventTarget extends EventTarget {
on(type, callback?, options?): void {
this.addEventListener(type, callback, options);
}
off(type, callback?, options?): void {
this.removeEventListener(type, callback, options);
}
}
const target = new NicerEventTarget();
new Event("foo", { bubbles: true, cancelable: false });
let callCount = 0;
const listener = (): void => {
++callCount;
};
target.on("foo", listener);
assertEquals(callCount, 0);
target.off("foo", listener);
assertEquals(callCount, 0);
});
test(function removingNullEventListenerShouldSucceed(): void {
const document = new EventTarget();
assertEquals(document.removeEventListener("x", null, false), undefined);
assertEquals(document.removeEventListener("x", null, true), undefined);
assertEquals(document.removeEventListener("x", null), undefined);
});
test(function constructedEventTargetUseObjectPrototype(): void {
const target = new EventTarget();
const event = new Event("toString", { bubbles: true, cancelable: false });
let callCount = 0;
const listener = (e): void => {
assertEquals(e, event);
++callCount;
};
target.addEventListener("toString", listener);
target.dispatchEvent(event);
assertEquals(callCount, 1);
target.dispatchEvent(event);
assertEquals(callCount, 2);
target.removeEventListener("toString", listener);
target.dispatchEvent(event);
assertEquals(callCount, 2);
});
test(function toStringShouldBeWebCompatibility(): void {
const target = new EventTarget();
assertEquals(target.toString(), "[object EventTarget]");
});
test(function dispatchEventShouldNotThrowError(): void {
let hasThrown = false;
try {
const target = new EventTarget();
const event = new Event("hasOwnProperty", {
bubbles: true,
cancelable: false
});
const listener = (): void => {};
target.addEventListener("hasOwnProperty", listener);
target.dispatchEvent(event);
} catch {
hasThrown = true;
}
assertEquals(hasThrown, false);
});
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