Tone.js/Tone/core/util/Draw.test.ts

import { expect } from "chai";
import { ONLINE_TESTING } from "../../../test/helper/Supports";
import { DrawClass } from "./Draw";

describe("Draw", () => {

	if (ONLINE_TESTING) {

		const draw = new DrawClass();

		after(() => {
			draw.dispose();
		});

		it("can schedule a callback at a AudioContext time", (done) => {
			const scheduledTime = draw.now() + 0.2;
			draw.schedule(() => {
				expect(draw.context.currentTime).to.be.closeTo(scheduledTime, 0.05);
				done();
			}, scheduledTime);
		});

		it("can schedule multiple callbacks", (done) => {
			let callbackCount = 0;
			const firstEvent = draw.now() + 0.1;
			draw.schedule(() => {
				callbackCount++;
				expect(draw.context.currentTime).to.be.closeTo(firstEvent, 0.05);
			}, firstEvent);

			const thirdEvent = draw.now() + 0.3;
			draw.schedule(() => {
				callbackCount++;
				expect(draw.context.currentTime).to.be.closeTo(thirdEvent, 0.05);
				expect(callbackCount).to.equal(3);
				done();
			}, thirdEvent);

			const secondEvent = draw.now() + 0.2;
			draw.schedule(() => {
				callbackCount++;
				expect(draw.context.currentTime).to.be.closeTo(secondEvent, 0.05);
			}, secondEvent);
		});

		it("can cancel scheduled events", (done) => {
			let callbackCount = 0;
			draw.schedule(() => {
				callbackCount++;
			}, draw.now() + 0.1);

			draw.schedule(() => {
				throw new Error("should not call this method");
			}, draw.now() + 0.2);

			draw.schedule(() => {
				throw new Error("should not call this method");
			}, draw.now() + 0.25);

			// cancel the second and third events
			draw.cancel(draw.now() + 0.15);

			// schedule another one after
			draw.schedule(() => {
				callbackCount++;
				expect(callbackCount).to.equal(2);
				done();
			}, draw.now() + 0.3);

		});
	}
});