Tone.js/test/helper/MonophonicTests.ts

import { expect } from "chai";
import { Offline } from "test/helper/Offline";
import { Monophonic } from "Tone/instrument/Monophonic";

// tslint:disable-next-line
export function MonophonicTest(Constr, note, constrArg?): void {

	context("Monophonic Tests", () => {

		it ("has an onsilence callback which is invoked after the release has finished", () => {
			let wasInvoked = false;
			return Offline(() => {
				const instance = new Constr(constrArg);
				instance.toDestination();
				instance.triggerAttackRelease(note, 0.1, 0);
				instance.onsilence = () => wasInvoked = true;
			}, 2).then(() => {
				expect(wasInvoked).to.equal(true);
			});
		});

		it ("invokes onsilence callback when the sustain is set to 0", () => {
			let wasInvoked = false;
			return Offline(() => {
				const instance = new Constr(constrArg);
				instance.toDestination();
				instance.envelope.sustain = 0;
				instance.triggerAttack(note, 0);
				instance.onsilence = () => wasInvoked = true;
			}, 2).then(() => {
				expect(wasInvoked).to.equal(true);
			});
		});
	});
}