Tone.js/Tone/effect/PitchShift.test.ts

import { PitchShift } from "./PitchShift";
import { BasicTests } from "test/helper/Basic";
import { EffectTests } from "test/helper/EffectTests";
import { expect } from "chai";
import { Oscillator } from "Tone/source/oscillator/Oscillator";
import { CompareToFile } from "test/helper/CompareToFile";

describe("PitchShift", () => {

	BasicTests(PitchShift);
	EffectTests(PitchShift);

	it("matches a file", () => {
		return CompareToFile(() => {
			const pitchShift = new PitchShift(4).toDestination();
			const osc = new Oscillator().toDestination().connect(pitchShift);
			osc.start(0);
		}, "pitchShift.wav", 0.3);
	});

	context("API", () => {

		it("can pass in options in the constructor", () => {
			const pitchShift = new PitchShift({
				windowSize: 0.2,
				pitch: 2
			});
			expect(pitchShift.windowSize).to.be.closeTo(0.2, 0.01);
			expect(pitchShift.pitch).to.be.closeTo(2, 0.01);
			pitchShift.dispose();
		});

		it("can set positive and negative pitches", () => {
			const pitchShift = new PitchShift();
			pitchShift.pitch = 2;
			expect(pitchShift.pitch).to.be.equal(2);
			pitchShift.pitch = -2;
			expect(pitchShift.pitch).to.be.equal(-2);
			pitchShift.pitch = -4.5;
			expect(pitchShift.pitch).to.be.equal(-4.5);
			pitchShift.dispose();
		});

		it("can get/set the options", () => {
			const pitchShift = new PitchShift();
			pitchShift.set({
				windowSize: 0.4,
			});
			expect(pitchShift.get().windowSize).to.be.closeTo(0.4, 0.01);
			pitchShift.dispose();
		});

		it("can set set the feedback and delay times", () => {
			const pitchShift = new PitchShift({
				delayTime: "4n",
				feedback: 0.3
			});
			expect(pitchShift.delayTime.value).to.be.closeTo(pitchShift.toSeconds("4n"), 0.01);
			expect(pitchShift.feedback.value).to.be.closeTo(0.3, 0.01);
			pitchShift.delayTime.value = 0.2;
			expect(pitchShift.delayTime.value).to.be.closeTo(0.2, 0.01);
			pitchShift.dispose();
		});
	});
});