1 files changed, 71 insertions, 0 deletions
diff --git a/internal/admin/api_room_grid_seed_test.go b/internal/admin/api_room_grid_seed_test.go
new file mode 100644
index 0000000..f1b347d
--- /dev/null
+++ b/internal/admin/api_room_grid_seed_test.go
@@ -0,0 +1,71 @@
+package admin
+
+// Regression: admin create/link grid prechecks seeded the layout from the
+// configured starting room. A detached in-progress area (not yet reachable
+// from the start room) was therefore never laid out, so a link that introduced
+// a grid twist was accepted, and auto-detecting a direction rejected two
+// adjacent detached rooms as "not reachable from the seed room". The prechecks
+// now seed from the room being edited.
+
+import (
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	"thehouseoficarus/internal/config"
+)
+
+// newDetachedAdminServer builds a server whose configured starting room (999)
+// is deliberately outside every room under test.
+func newDetachedAdminServer(t *testing.T, rooms map[int]string) *AdminServer {
+	t.Helper()
+	s := newTestAdminServer(t, rooms)
+	s.cfg = config.Default()
+	s.cfg.StartingRoom = 999
+	return s
+}
+
+func postLink(t *testing.T, s *AdminServer, body string) (map[string]any, int) {
+	t.Helper()
+	req := httptest.NewRequest(http.MethodPost, "/api/rooms/link", strings.NewReader(body))
+	req.Header.Set("Content-Type", "application/json")
+	rr := httptest.NewRecorder()
+	s.handleRoomLink(rr, req)
+	var resp map[string]any
+	_ = json.Unmarshal(rr.Body.Bytes(), &resp)
+	return resp, rr.Code
+}
+
+func TestLinkConflictDetectedInDetachedArea(t *testing.T) {
+	s := newDetachedAdminServer(t, map[int]string{
+		10: "id: 10\nname: A\nexits:\n  north:\n    room: 11\n",
+		11: "id: 11\nname: B\nexits:\n  south:\n    room: 10\n  east:\n    room: 12\n",
+		12: "id: 12\nname: C\n",
+		// Starting room outside the component under edit.
+		999: "id: 999\nname: Start\n",
+	})
+
+	// 10-e north->11 and 11-east->12 place 12 at (1,-1); adding 10-east->12
+	// would also place it at (1,0) — a twist the detached precheck must catch.
+	if resp, code := postLink(t, s, `{"from":10,"to":12,"dir":"east"}`); code != http.StatusConflict {
+		t.Fatalf("detached link that creates a grid twist: status = %d (%v), want %d", code, resp, http.StatusConflict)
+	}
+}
+
+func TestAutoDirectionWorksInDetachedArea(t *testing.T) {
+	s := newDetachedAdminServer(t, map[int]string{
+		10:  "id: 10\nname: A\nexits:\n  east:\n    room: 11\n",
+		11:  "id: 11\nname: B\nexits:\n  west:\n    room: 10\n",
+		999: "id: 999\nname: Start\n",
+	})
+
+	resp, code := postLink(t, s, `{"from":10,"to":11}`)
+	if code != http.StatusOK {
+		t.Fatalf("auto-direction in a detached area: status = %d (%v), want 200", code, resp)
+	}
+	if got := roomExitTarget(s, 10, "east"); got != 11 {
+		t.Fatalf("room 10 east exit = %d, want 11", got)
+	}
+}