describe('test environment', () => {
  it('handles object spread', () => {
    const {x, y, ...z} = {x: 1, y: 2, a: 3, b: 4};
    expect(x).toEqual(1);
    expect(y).toEqual(2);
    expect(z).toEqual({a: 3, b: 4});
  });

  it('handles async await', async() => {
    const result = await new Promise((r) => r('hello'));
    expect(result).toEqual('hello');
  });
});