tone/Tone/signal/Abs.test.ts

A Web Audio framework for making interactive music in the browser.

import { BasicTests } from "../../test/helper/Basic.js";
import { connectFrom, connectTo } from "../../test/helper/Connect.js";
import { ConstantOutput } from "../../test/helper/ConstantOutput.js";
import { Abs } from "./Abs.js";
import { Signal } from "./Signal.js";

describe("Abs", () => {
	BasicTests(Abs);

	context("Absolute Value", () => {
		it("outputs the same value for positive values", () => {
			return ConstantOutput(() => {
				const signal = new Signal(0.4);
				const abs = new Abs();
				signal.connect(abs);
				abs.toDestination();
			}, 0.4);
		});

		it("outputs 0 when the input is 0", () => {
			return ConstantOutput(() => {
				const signal = new Signal(0);
				const abs = new Abs();
				signal.connect(abs);
				abs.toDestination();
			}, 0);
		});

		it("outputs the absolute value for negative numbers", () => {
			return ConstantOutput(() => {
				const signal = new Signal(-0.3);
				const abs = new Abs();
				signal.connect(abs);
				abs.toDestination();
			}, 0.3);
		});
	});
});