Codecademy export

index.js

// Define a rooster
Rooster = {};

// Return a morning rooster call
Rooster.announceDawn = () => {
  return 'cock-a-doodle-doo!';
}

// Return hour as string
// Throws Error if hour is not between 0 and 23 inclusive
Rooster.timeAtDawn = (hour) => {
  if (hour < 0 || hour > 23) {
    throw new RangeError;
  } else {
    return hour.toString();
  };
}

module.exports = Rooster;

index_test.js

const assert = require('assert');
const Rooster = require('../index.js');

describe('Rooster', () => {
  describe('.announceDawn', () => {
    it('returns a rooster call', () => {
      // Setup
      const expected = 'cock-a-doodle-doo!';

      // Exercise
      const actual = Rooster.announceDawn();

      // Verify
      assert.strictEqual(actual, expected);
    })
  })
  describe('.timeAtDawn', () => {
    it('returns its argument as a string', () => {
      // Setup
      const input = 12;
      const expected = '12'

      // Exercise
      const actual = Rooster.timeAtDawn(input);

      // Verify
      assert.strictEqual(actual, expected);
    })
    it('throws a RangeError if passed a number less than 0', () => {
      // Setup
      const input = -1;

      // Exercise / Verify
      const actual = () => Rooster.timeAtDawn(input);
      assert.throws(actual, RangeError);
    })
    it('throws a RangeError if passed a number greater than 23', () => {
      // Setup
      const input = 24;

      // Exercise / Verify
      const actual = () => Rooster.timeAtDawn(input);
      assert.throws(actual, RangeError);
    })
  })
})