Harden D&D scene description extraction

internal/modules/dnd/normalize/scenedescriptions/normalizer_test.go

@@ -65,6 +65,24 @@ func TestNormalizeRejectsInvalidCandidatesAndConflicts(t *testing.T) {
 	}
 }
 
+func TestNormalizeUsesDocumentOrderRatherThanNumericUnitID(t *testing.T) {
+	doc := &source.SourceDocument{ID: "session", Units: []source.SourceUnit{
+		{ID: 20, Text: "The party arrives."},
+		{ID: 10, Text: "The party departs."},
+	}}
+	input := dnd.SceneDescriptionList{Scenes: []dnd.SceneDescription{
+		scene("later", 10, 10, dnd.SceneKindNarrative, "Departure", "The party departs."),
+		scene("first", 20, 20, dnd.SceneKindNarrative, "Arrival", "The party arrives."),
+	}}
+	result, err := New(Options{}).Normalize(context.Background(), normalizeRequest(input, doc))
+	if err != nil {
+		t.Fatalf("Normalize() error = %v", err)
+	}
+	if got, want := []string{result.Value.Scenes[0].ID, result.Value.Scenes[1].ID}, []string{"first", "later"}; !reflect.DeepEqual(got, want) {
+		t.Fatalf("scene order = %#v, want %#v", got, want)
+	}
+}
+
 func TestNormalizerContractAndCancellation(t *testing.T) {
 	if _, err := DecodeOptions(nil); err != nil {
 		t.Fatalf("DecodeOptions(nil) error = %v", err)