diff --git a/tree_test.go b/tree_test.go
index e7733d3..92dc6ff 100644
--- a/tree_test.go
+++ b/tree_test.go
@@ -1 +1,16 @@
 package godzilla
+
+func catchPanic(f func()) (recv interface{}) {
+	defer func() {
+		recv = recover()
+	}()
+
+	f()
+
+	return
+}
+
+type testRouter struct {
+	path     string
+	conflict bool
+}