text: import test from 'ava';
  import mergeSort from './';
  
  const numsArr = [46, 24, 33, 10, 2, 81, 50];
  const expectedNumsArr = [2, 10, 24, 33, 46, 50, 81];
  
  test('Merge sort test array of numbers', t => {
  	t.deepEqual(mergeSort(numsArr), expectedNumsArr);
  });
  
  const lettersArr = ['d', 'h', 'z', 'a', 'r', 'b', 'i'];
  const expectedlettersArr = [ 'a', 'b', 'd', 'h', 'i', 'r', 'z' ];
  
  test('Merge sort test array of letters', t => {
  	t.deepEqual(mergeSort(lettersArr), expectedlettersArr);
  });
  
  const wordsArr = ['happy', 'auto', 'energy', 'zoo', 'trigonometry', 'dog', 'foo'];
  const expectedWordsArr = [ 'auto', 'dog', 'energy', 'foo', 'happy', 'trigonometry', 'zoo' ];
  
  test('Merge sort test array of words', t => {
  	t.deepEqual(mergeSort(wordsArr), expectedWordsArr);
  });
  