code: func (c *Call) Return(returnArguments ...interface{}) *Call {
  	c.lock()
  	defer c.unlock()
  
  	c.ReturnArguments = returnArguments
  
  	return c
  }
docs: // Return specifies the return arguments for the expectation.
  //
  //    Mock.On("DoSomething").Return(errors.New("failed"))