func (te *stubTestHttpService) Foo(ctx context.Context, s string) (rs string, err error) {
	return rs, err
}
Implement the business logic of Foo
package service
import "context"
type TestHttpService interface {
	Foo(ctx context.Context, s string) (rs string, err error)
}
type stubTestHttpService struct{}
func New() (s *stubTestHttpService) {
	s = &stubTestHttpService{}
	return s
}