import { expect } from "chai";
import "mocha";
import cryptoRandomHex from "./cryptoRandomHex";

const HEXSTR_REGEX = /^[0-9a-f]+$/;

describe("cryptoRandomHex", () => {
  it("should generate hexadecimal strings with 8 bytes of entropy if no argument is provided", () => {
    for (let i = 0; i < 1e5; i++) {
      const str = cryptoRandomHex();
      expect(str.length).to.equal(8 * 2);
      expect(str).to.match(HEXSTR_REGEX);
    }
  }).timeout(60000);

  it("should generate hexadecimal strings with entropy bytes equal to provided argument", () => {
    for (let i = 0; i < 1e5; i++) {
      // Use Math.ceil to prevent zero.
      const length = Math.ceil(Math.random() * 2048);
      const str = cryptoRandomHex(length);
      expect(str.length).to.equal(length * 2);
      expect(str).to.match(HEXSTR_REGEX);
    }
  }).timeout(60000);

  it("should generate an empty string when provided argument is less than or equal to zero", () => {
    for (let i = 0; i < 1e5; i++) {
      const length = -Math.floor(Math.random() * 1024);
      const str = cryptoRandomHex(length);
      expect(str).to.equal("");
    }
  }).timeout(60000);
});