如何在jest中模拟es6类上的实例/类变量？

// MyClass.js
export default class MyClass {
  constructor() {
    this.instanceVariable = 'instanceValue';
  }

  static staticVariable = 'staticValue';

  instanceMethod() {
    return 'instanceMethod';
  }

  static staticMethod() {
    return 'staticMethod';
  }
}

// MyClass.test.js
import MyClass from './MyClass';

jest.mock('./MyClass'); // 模拟类的导入

describe('MyClass', () => {
  beforeEach(() => {
    MyClass.mockClear(); // 清除模拟类的调用记录
  });

  it('should mock instance variable', () => {
    const myInstance = new MyClass();
    expect(myInstance.instanceVariable).toBeUndefined(); // 模拟类的实例变量被替换为undefined
  });

  it('should mock static variable', () => {
    expect(MyClass.staticVariable).toBeUndefined(); // 模拟类的静态变量被替换为undefined
  });

  it('should mock instance method', () => {
    const myInstance = new MyClass();
    const instanceMethodSpy = jest.spyOn(myInstance, 'instanceMethod');
    instanceMethodSpy.mockReturnValue('mockedInstanceMethod'); // 模拟类的实例方法返回值

    expect(myInstance.instanceMethod()).toBe('mockedInstanceMethod'); // 调用模拟的实例方法
    expect(instanceMethodSpy).toHaveBeenCalled(); // 验证模拟方法被调用
  });

  it('should mock static method', () => {
    const staticMethodSpy = jest.spyOn(MyClass, 'staticMethod');
    staticMethodSpy.mockReturnValue('mockedStaticMethod'); // 模拟类的静态方法返回值

    expect(MyClass.staticMethod()).toBe('mockedStaticMethod'); // 调用模拟的静态方法
    expect(staticMethodSpy).toHaveBeenCalled(); // 验证模拟方法被调用
  });
});