forked from sashin/sashinexists
69 lines
2.0 KiB
JavaScript
69 lines
2.0 KiB
JavaScript
import assert from "node:assert";
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import { describe, test } from "node:test";
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import EventTargetMixin from "../../src/runtime/EventTargetMixin.js";
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class EventTargetTest extends EventTargetMixin(Object) {}
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describe("EventTargetMixin", () => {
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test("add and dispatch event", () => {
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const fixture = new EventTargetTest();
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const event = new Event("test");
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let callCount = 0;
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const callback = () => {
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callCount++;
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};
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fixture.addEventListener("test", callback);
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// Add twice, ensure that the callback is only called once.
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fixture.addEventListener("test", callback);
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const dispatched = fixture.dispatchEvent(event);
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assert(dispatched);
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assert.equal(callCount, 1);
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});
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test("dispatch event with no listeners", () => {
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const fixture = new EventTargetTest();
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const event = new Event("test");
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const takeDefaultAction = fixture.dispatchEvent(event);
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assert(takeDefaultAction);
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});
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test("remove event listener", () => {
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const fixture = new EventTargetTest();
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const event = new Event("test");
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let callCount = 0;
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const callback = () => {
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callCount++;
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};
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fixture.addEventListener("test", callback);
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fixture.removeEventListener("test", callback);
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fixture.dispatchEvent(event);
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assert.equal(callCount, 0);
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});
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test("stop immediate propagation", () => {
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const fixture = new EventTargetTest();
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const event = new Event("test");
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let callCount = 0;
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fixture.addEventListener("test", (event) => {
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callCount++;
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event.stopImmediatePropagation();
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});
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fixture.addEventListener("test", () => {
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callCount++;
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});
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fixture.dispatchEvent(event);
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assert.equal(callCount, 1);
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});
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test("prevent default", () => {
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const fixture = new EventTargetTest();
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const event = new Event("test");
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fixture.addEventListener("test", (event) => {
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event.preventDefault();
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});
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const takeDefaultAction = fixture.dispatchEvent(event);
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assert(!takeDefaultAction);
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assert(event.defaultPrevented);
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});
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});
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