使用指针参考进行测试功能

Question

I'm working on unit tests on a Go project, and I'm new to Go. So to start I wanted to test something easy. And I started with this function:

func (this *Service) InList(idPerson string, personsId []string) bool {
    for _, personsId := range personsId {
        if id == idPerson {
            return true
        }
    }

    return false
}

Service is a struct defined on top of the class.

This is the test I wrote:

func TestValidatePersonID(t *testing.T) {
   personID := "12345"

   personIDs := []string{"12345", "123456t", "1234567a"}

   ok := *Service.InList(personID, personIDs)

   if !ok {
      t.Errorf("Id %v not found", personID)
   }
}

If i try to Call Service without * I get the error:

invalid method expresion (needs pointer reciever)

If i try to call the function (*Service).inList, it says I'm missing an argument. I'm new to Go if anyone could point to me what I'm doing wrong and how Could I get a pointer receiver of that Service in my test?. I would appreciatte it.

Answer 1

You have to call a method on an instance of its receiver type. So, for a method defined on *Service, you must call it on an instance of *Service:

var foo *Service
foo = &Service{}
foo.InList(personID, personIDs)

However, in your case, there's no reason for this to be a method; it doesn't seem to have anything at all to do with its receiver (it never references it), so it could just be a regular function. Also note that it's unidiomatic to name the receiver this in Go.

I also highly recommend at least taking the Go tour, which covers writing methods in detail, with interactive examples.