code: func (_m *ReadWriter) Append(block *common.Block) error {
  	ret := _m.Called(block)
  
  	var r0 error
  	if rf, ok := ret.Get(0).(func(*common.Block) error); ok {
  		r0 = rf(block)
  	} else {
  		r0 = ret.Error(0)
  	}
  
  	return r0
  }
docs: // Append provides a mock function with given fields: block