1 files changed, 107 insertions, 0 deletions
diff --git a/internal/game/exit_migrate_test.go b/internal/game/exit_migrate_test.go
new file mode 100644
index 0000000..05edea5
--- /dev/null
+++ b/internal/game/exit_migrate_test.go
@@ -0,0 +1,107 @@
+package game
+
+import (
+	"reflect"
+	"testing"
+
+	"thehouseoficarus/internal/player"
+)
+
+func TestRewritePlayerRoomIDsRename(t *testing.T) {
+	p := &player.Player{
+		RoomID:       10,
+		EnterSeqRoom: 20,
+		Flags: map[string]any{
+			"hidden_exit_10_north": 1,
+			"hidden_exit_20_down":  1,
+			"unrelated_flag":       1,
+		},
+		MapSymbols: map[int]player.MapSymbolData{
+			10: {Char: "X"},
+			30: {Char: "Y"},
+		},
+	}
+	p.Stats.RoomsVisited = map[int]bool{10: true, 40: true}
+
+	idMap := map[int]int{10: 100, 20: 200}
+	if !rewritePlayerRoomIDs(p, idMap) {
+		t.Fatal("expected changed=true")
+	}
+
+	if p.RoomID != 100 {
+		t.Errorf("RoomID = %d, want 100", p.RoomID)
+	}
+	if p.EnterSeqRoom != 200 {
+		t.Errorf("EnterSeqRoom = %d, want 200", p.EnterSeqRoom)
+	}
+
+	wantFlags := map[string]any{
+		"hidden_exit_100_north": 1,
+		"hidden_exit_200_down":  1,
+		"unrelated_flag":        1,
+	}
+	if !reflect.DeepEqual(p.Flags, wantFlags) {
+		t.Errorf("Flags = %v, want %v", p.Flags, wantFlags)
+	}
+
+	if _, ok := p.MapSymbols[100]; !ok {
+		t.Error("MapSymbols missing key 100")
+	}
+	if _, ok := p.MapSymbols[30]; !ok {
+		t.Error("MapSymbols missing unchanged key 30")
+	}
+	if _, ok := p.MapSymbols[10]; ok {
+		t.Error("MapSymbols should not still have key 10")
+	}
+	if !p.Stats.RoomsVisited[100] {
+		t.Error("RoomsVisited missing key 100")
+	}
+	if !p.Stats.RoomsVisited[40] {
+		t.Error("RoomsVisited missing unchanged key 40")
+	}
+	if p.Stats.RoomsVisited[10] {
+		t.Error("RoomsVisited should not still have key 10")
+	}
+}
+
+func TestRewritePlayerRoomIDsNoChange(t *testing.T) {
+	p := &player.Player{
+		RoomID: 5,
+		Flags:  map[string]any{"hidden_exit_5_north": 1},
+	}
+	if rewritePlayerRoomIDs(p, map[int]int{99: 100}) {
+		t.Error("expected changed=false when no embedded ID matches")
+	}
+	if p.RoomID != 5 {
+		t.Errorf("RoomID = %d, want 5 (untouched)", p.RoomID)
+	}
+	if _, ok := p.Flags["hidden_exit_5_north"]; !ok {
+		t.Error("hidden_exit_5_north should be unchanged")
+	}
+}
+
+// A swap idMap (A<->B) must not clobber a flag whose old key maps to another
+// flag's old key and vice versa.
+func TestRewritePlayerRoomIDsSwap(t *testing.T) {
+	p := &player.Player{
+		RoomID: 10,
+		Flags: map[string]any{
+			"hidden_exit_10_north": 1,
+			"hidden_exit_100_east": 1,
+		},
+	}
+	swap := map[int]int{10: 100, 100: 10}
+	if !rewritePlayerRoomIDs(p, swap) {
+		t.Fatal("expected changed=true")
+	}
+	if p.RoomID != 100 {
+		t.Errorf("RoomID = %d, want 100", p.RoomID)
+	}
+	wantFlags := map[string]any{
+		"hidden_exit_100_north": 1,
+		"hidden_exit_10_east":   1,
+	}
+	if !reflect.DeepEqual(p.Flags, wantFlags) {
+		t.Errorf("Flags = %v, want %v", p.Flags, wantFlags)
+	}
+}