Tone.js/Tone/source/oscillator/PWMOscillator.test.ts

import { expect } from "chai";
import { BasicTests } from "test/helper/Basic";
import { CompareToFile } from "test/helper/CompareToFile";
import { connectFrom } from "test/helper/Connect";
import { OscillatorTests } from "test/helper/OscillatorTests";
import { SourceTests } from "test/helper/SourceTests";
import { PWMOscillator } from "./PWMOscillator";

describe("PWMOscillator", () => {

	// run the common tests
	BasicTests(PWMOscillator);
	SourceTests(PWMOscillator);
	OscillatorTests(PWMOscillator);

	it("matches a file", () => {
		return CompareToFile(() => {
			const osc = new PWMOscillator().toDestination();
			osc.start(0.1);
		}, "pwmOscillator.wav", 0.01);
	});

	context("Modulation Frequency", () => {

		it("can set the modulation frequency", () => {
			const pwm = new PWMOscillator();
			pwm.modulationFrequency.value = 0.2;
			expect(pwm.modulationFrequency.value).to.be.closeTo(0.2, 0.001);
			pwm.dispose();
		});

		it("can connect a signal to the modulationFrequency", () => {
			const pwm = new PWMOscillator();
			connectFrom().connect(pwm.modulationFrequency);
			pwm.dispose();
		});

	});

	context("Types", () => {
		it("reports it's type", () => {
			const osc = new PWMOscillator();
			expect(osc.type).to.equal("pwm");
			expect(osc.baseType).to.equal("pwm");
			expect(osc.partials).to.deep.equal([]);
			osc.dispose();
		});
	});
});