Tone.js/test/helper/Basic.ts

import { expect } from "chai";
import "Tone/core/clock/Transport";
import "Tone/core/context/Destination";
import { OfflineContext } from "Tone/core/context/OfflineContext";
import { ToneWithContext } from "Tone/core/context/ToneWithContext";
import { Tone } from "Tone/core/Tone";
import { ConnectTest } from "./Connect";
import { setLogger } from "Tone/core/util/Debug";
import { ToneAudioNode } from "Tone/core/context/ToneAudioNode";

export const testAudioContext = new OfflineContext(1, 1, 11025);

export function BasicTests(Constr, ...args: any[]): void {

	context("Basic", () => {

		it("can be created and disposed", () => {
			const instance = new Constr(...args);
			instance.dispose();
			// check that all of the attributes were disposed
			expect(instance.disposed).to.equal(true);
			// also check all of it's attributes to see if they also have the right context
			for (const member in instance) {
				if (instance[member] instanceof Tone && member !== "context") {
					expect(instance[member].disposed, `member ${member}`).to.equal(true);
				}
			}
		});

		it("extends Tone", () => {
			const instance = new Constr(...args);
			expect(instance).to.be.an.instanceof(Tone);
			instance.dispose();
		});

		it("can specify the AudioContext", () => {
			const instance = new Constr(Object.assign({
				context: testAudioContext,
			}, ...args));
			if (instance instanceof ToneWithContext) {
				expect(instance.context).to.equal(testAudioContext);
				// also check all of it's attributes to see if they also have the right context
				for (const member in instance) {
					if (instance[member] instanceof ToneWithContext) {
						expect(instance[member].context, `member: ${member}`).to.equal(testAudioContext);
					}
				}
			}
			instance.dispose();
		});

		it("can be serialized to JSON", () => {
			const instance = new Constr(...args);
			if (instance instanceof ToneAudioNode) {
				const json = instance.get();
				// this throws an error if the object is recursive
				JSON.stringify(json);
			}
		});

		ConnectTest(Constr, ...args);
	});
}

/**
 * Assert that the function triggers a warning
 */
export async function warns(fn: (...args: any[]) => any): Promise<void> {
	let wasInvoked = false;
	setLogger({
		log: () => {},
		warn: () => wasInvoked = true,
	});
	const ret = fn();
	if (ret instanceof Promise) {
		await ret;
	}
	expect(wasInvoked).to.equal(true);
	// return to the original logger
	setLogger(console);
}