const expect = require('expect');
const randomHexColorCode = require('./randomHexColorCode.js');

test('randomHexColorCode is a Function', () => {
  expect(randomHexColorCode).toBeInstanceOf(Function);
});
test('randomHexColorCode has to proper length', () => {
  expect(randomHexColorCode().length).toBe(7);
});
test('The color code starts with "#"', () => {
  expect(randomHexColorCode().startsWith('#')).toBeTruthy();
});
test('The color code contains only valid hex-digits', () => {
  expect(
    randomHexColorCode()
      .slice(1)
      .match(/[^0123456789abcdef]/i) === null
  ).toBeTruthy();
});
