package mocks import ( "errors" "testing" "github.com/miekg/dns" ) func TestEncoder(t *testing.T) { t.Run("Encode", func(t *testing.T) { expected := errors.New("mocked error") e := &Encoder{ MockEncode: func(domain string, qtype uint16, padding bool) ([]byte, error) { return nil, expected }, } out, err := e.Encode("dns.google", dns.TypeA, true) if !errors.Is(err, expected) { t.Fatal("unexpected err", err) } if out != nil { t.Fatal("unexpected out") } }) }