Mocking receiver functions in Go

I'm trying to unit test a receiver function that calls other receiver functions in that struct.

Let's say I want to test Three() and mock the call to two() in the following:

type MyStruct struct {
    a string
    b string
}

func (m *MyStruct) one() int {
    return 2
}

func (m *MyStruct) two() int {
    return m.one() * 2
}

func (m *MyStruct) Three() int {
    return m.two() * 2
}

I was following method two of the following answer.

I created a custom constructor for every single function that I wanted to unit test and overrode those methods with mocked versions. But I thought it may not be easy to maintain the code once the number of functions grow.

Is there any preferred way of mocking such functions? I wish the official documentation had some guidelines on how to mock things in different scenarios, similar to what mox on Python provides.

Also, note that I don't want to use a third party mocking library.