我的解决方案是模拟getBoundingClientRect (我目前正在使用jest 16.0.1)

My solution is to mock getBoundingClientRect (I'm currently using jest 16.0.1)

describe('Mock `getBoundingClientRect`', () => {
    beforeEach(() => {
        Element.prototype.getBoundingClientRect = jest.fn(() => {
            return {
                width: 120,
                height: 120,
                top: 0,
                left: 0,
                bottom: 0,
                right: 0,
            }
        });
    });
    it('should mock `getBoundingClientRect`', () => {
        const element = document.createElement('span');
        const rect = element.getBoundingClientRect();
        expect(rect.width).toEqual(120);
    });

});