docs: reorder & testing

pkg/transcoder/report_test.go

@@ -14,6 +14,40 @@ import (
 	"github.com/google/uuid"
 )
 
+func TestGameReportRequestPayloadRoundTrip(t *testing.T) {
+	t.Parallel()
+
+	source := &model.GameReportRequest{
+		GameID: uuid.MustParse("11111111-2222-3333-4444-555555555555"),
+		Turn:   42,
+	}
+
+	payload, err := GameReportRequestToPayload(source)
+	if err != nil {
+		t.Fatalf("encode game report request: %v", err)
+	}
+
+	decoded, err := PayloadToGameReportRequest(payload)
+	if err != nil {
+		t.Fatalf("decode game report request: %v", err)
+	}
+
+	if !reflect.DeepEqual(source, decoded) {
+		t.Fatalf("round-trip mismatch\nsource:  %#v\ndecoded: %#v", source, decoded)
+	}
+}
+
+func TestGameReportRequestRejectsEmptyAndNil(t *testing.T) {
+	t.Parallel()
+
+	if _, err := GameReportRequestToPayload(nil); err == nil {
+		t.Fatalf("expected error encoding nil request")
+	}
+	if _, err := PayloadToGameReportRequest(nil); err == nil {
+		t.Fatalf("expected error decoding empty payload")
+	}
+}
+
 func TestReportToPayloadAndPayloadToReportRoundTrip(t *testing.T) {
 	t.Parallel()