79 lines
1.9 KiB
JavaScript
79 lines
1.9 KiB
JavaScript
"use strict";
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test(() => {
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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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assert_equals(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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assert_equals(callCount, 1);
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target.dispatchEvent(event);
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assert_equals(callCount, 2);
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target.removeEventListener("foo", listener);
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target.dispatchEvent(event);
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assert_equals(callCount, 2);
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}, "A constructed EventTarget can be used as expected");
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test(() => {
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const target = new EventTarget();
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const event = new Event("foo");
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function listener(e) {
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assert_equals(e, event);
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assert_equals(e.target, target);
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assert_equals(e.currentTarget, target);
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assert_array_equals(e.composedPath(), [target]);
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}
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target.addEventListener("foo", listener, { once: true });
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target.dispatchEvent(event);
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assert_equals(event.target, target);
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assert_equals(event.currentTarget, null);
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assert_array_equals(event.composedPath(), []);
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}, "A constructed EventTarget implements dispatch correctly");
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test(() => {
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class NicerEventTarget extends EventTarget {
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on(...args) {
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this.addEventListener(...args);
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}
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off(...args) {
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this.removeEventListener(...args);
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}
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dispatch(type, detail) {
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this.dispatchEvent(new CustomEvent(type, { detail }));
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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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const detail = "some data";
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let callCount = 0;
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function listener(e) {
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assert_equals(e.detail, detail);
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++callCount;
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}
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target.on("foo", listener);
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target.dispatch("foo", detail);
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assert_equals(callCount, 1);
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target.dispatch("foo", detail);
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assert_equals(callCount, 2);
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target.off("foo", listener);
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target.dispatch("foo", detail);
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assert_equals(callCount, 2);
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}, "EventTarget can be subclassed");
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