import "mocha";
import { expect } from "chai";
import { is, numbers, objects, funcs } from "../helpers";

describe('Thunk factory "is.instanceOf"', () => {
	const Thing = class {};
	const thing = new Thing();

	it("recognizes instances of a class and/or its derived ones", () => {
		const Derived = class extends Thing {};
		const valid = [ thing, new Derived() ];
		const invalid = [ ...numbers, ...objects, ...funcs, Thing, Derived ];
		const thunk = is.instanceOf(Thing);

		for (const value of valid)
			expect(thunk(value)).to.be.true;

		for (const value of invalid)
			expect(thunk(value)).to.be.false;

		expect(is.instanceOf(Number)(5)).to.be.false;
	});

	it("accepts any number of type-like arguments", () => {
		const Another = class {};
		const another = new Another();
		const thunk = is.instanceOf(Thing, Another);
		const valid = [ another, thing ];

		for (const value of valid)
			expect(thunk(value)).to.be.true;

		expect(thunk(new (class {})())).to.be.false;
	});
});