Let’s say you have the following

type Person interface {
  GetFullName() string
  PrintName()
}
type Banker struct {
  FirstName string
  LastName string
}
func (b Banker) GetFullName() string {
  return fmt.Sprintf("%s %s", b.FirstName, b.LastName)
}
func (b Banker) PrintName() {
  return log.Println(b.GetFullName())
}

How do you mock GetFullName from PrintName?

Note, this is just an example to make the problem easier to understand