test('formats', () => {
  expect(genDiff('./__fixtures__/file1.json', './__fixtures__/file2.json', 'stylish')).toBe(stylishFormat);
  expect(genDiff('./__fixtures__/file1.json', './__fixtures__/file2.json', 'plain')).toBe(plainFormat);
  expect(genDiff('./__fixtures__/file1.json', './__fixtures__/file2.json', 'json')).toBe(jFormat);
});