example mocking in Golang

mocks.go

type APIClientIface interface {
  CreateAccountInOrgUnit() bool
}

type RealAPIClient struct {}

func (ac RealAPIClient) CreateAccountInOrgUnit() bool {
  // ...
}


type Manager struct {
  client APIClientIface // RealAPIClient
}

func (m Manager) CreateAccount() {
  m.client.CreateAccountInOrgUnit()
  // ...
}


// real code

client := APIClient{}
mgr := Manager{
  client: client,
}
mgr.CreateAccount()



// tests

type FakeAPIClient struct {}

func (ac FakeAPIClient) CreateAccountInOrgUnit() bool {
  return true
}


fakeClient := FakeAPIClient{}
mgr := Manager{
  client: fakeClient,
}
mgr.CreateAccount()