import "mocha";
import { expect } from "chai";
import { is, numbers, choice, ints, floats } from "../helpers";
import { Thunk } from "@valuer/types";

describe('Thunk factory "is.array"', () => {
	it("recognizes arrays", () => {
		const thunk = is.array<number>();
		const valid = [ numbers, [], "text".split("") ];
		const invalid = [ choice(numbers), "text" ];

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

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

	it("accepts expected array length", () => {
		const thunk = is.array(5);
		const valid = [ "abcde".split(""), Array.from({ length: 5 }) ];
		const invalid = [ [], "text".split(""), Array.from({ length: 3 }) ]

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

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

	it("accepts item-validating thunk", () => {
		const thunk = is.array(<any> null, <Thunk> Number.isInteger);

		expect(thunk(ints)).to.be.true;
		expect(thunk(floats)).to.be.false;
	});
});