From 6a889d87cf5731279da526ff9b1b4d7f849f173c Mon Sep 17 00:00:00 2001
From: Sebastian Bergmann <sb@sebastian-bergmann.de>
Date: Sun, 8 Dec 2024 10:46:15 +0100
Subject: [PATCH] Document assumption that we have a Directory object

---
 src/Node/Iterator.php | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/Node/Iterator.php b/src/Node/Iterator.php
index b110d4679..2861db664 100644
--- a/src/Node/Iterator.php
+++ b/src/Node/Iterator.php
@@ -9,6 +9,7 @@
  */
 namespace SebastianBergmann\CodeCoverage\Node;
 
+use function assert;
 use function count;
 use RecursiveIterator;
 
@@ -74,6 +75,8 @@ public function next(): void
      */
     public function getChildren(): self
     {
+        assert($this->nodes[$this->position] instanceof Directory);
+
         return new self($this->nodes[$this->position]);
     }