feat: startup validation of opposite-direction exits between rooms

1 files changed, 46 insertions, 0 deletions

diff --git a/internal/validate/local_test.go b/internal/validate/local_test.go
index 23bf8ca..d37838e 100644
--- a/internal/validate/local_test.go
+++ b/internal/validate/local_test.go
@@ -116,6 +116,52 @@ objects:
 	}
 }
 
+func TestValidateExitReciprocityOK(t *testing.T) {
+	dir := t.TempDir()
+	writeFile(t, filepath.Join(dir, "rooms", "1.yaml"), `name: Room One
+exits:
+  north: 2
+`)
+	writeFile(t, filepath.Join(dir, "rooms", "2.yaml"), `name: Room Two
+exits:
+  south: 1
+`)
+	issues := validateExitReciprocity(newSource(dir))
+	if len(issues) != 0 {
+		t.Errorf("expected no issues for correct reciprocal exits, got: %+v", issues)
+	}
+}
+
+func TestValidateExitReciprocityMismatch(t *testing.T) {
+	dir := t.TempDir()
+	writeFile(t, filepath.Join(dir, "rooms", "1.yaml"), `name: Room One
+exits:
+  down: 2
+`)
+	writeFile(t, filepath.Join(dir, "rooms", "2.yaml"), `name: Room Two
+exits:
+  south: 1
+`)
+	issues := validateExitReciprocity(newSource(dir))
+	if !containsMsg(issues, "not the expected opposite direction") {
+		t.Errorf("expected mismatch warning, got: %+v", issues)
+	}
+}
+
+func TestValidateExitReciprocityOneWay(t *testing.T) {
+	dir := t.TempDir()
+	writeFile(t, filepath.Join(dir, "rooms", "1.yaml"), `name: Room One
+exits:
+  east: 2
+`)
+	writeFile(t, filepath.Join(dir, "rooms", "2.yaml"), `name: Room Two
+`)
+	issues := validateExitReciprocity(newSource(dir))
+	if len(issues) != 0 {
+		t.Errorf("expected no issues for one-way exit, got: %+v", issues)
+	}
+}
+
 func TestValidateRoomsPartialNameSiblingsOK(t *testing.T) {
 	dir := t.TempDir()
 	writeFile(t, filepath.Join(dir, "rooms", "1.yaml"), `name: Test Room