test('extesions', () => {
  expect(genDiff('./__fixtures__/file1.json', './__fixtures__/file2.json', 'stylish')).toBe(stylishFormat);
  expect(genDiff('./__fixtures__/file1.ini', './__fixtures__/file2.ini', 'stylish')).toBe(stylishFormat);
  expect(genDiff('./__fixtures__/file1.yml', './__fixtures__/file2.yml', 'stylish')).toBe(stylishFormat);
});