static 方法支持mock吗？

class ClassName { 
  constructor() { 
  } 
 
  method_1(...arg: number[]) { 
    return '888888'; 
  } 
 
  method_2(...arg: number[]) { 
    return '999999'; 
  } 
 
  static method_3(...arg: number[]):string { 
    return 'static method_3 called'; 
  } 
} 
 
let func_3: Function = mocker.mockFunc(ClassName, ClassName.method_3); 
when(func_3)().afterReturn("staticFunMock"); 
let str = ClassName.method_3(); 
expect(str).assertEqual("staticFunMock"); 
mocker.clear(func_3);