Adds nested Higher Order Expectations.

src/Concerns/RetrievesValues.php

@@ -0,0 +1,29 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Concerns;
+
+/**
+ * @internal
+ */
+trait RetrievesValues
+{
+    /**
+     * Safely retrieve the value at the given key from an object or array.
+     *
+     * @param array<mixed>|object $value
+     * @param mixed               $default
+     *
+     * @return mixed
+     */
+    private function retrieve(string $key, $value, $default = null)
+    {
+        if (is_array($value)) {
+            return $value[$key] ?? $default;
+        }
+
+        // @phpstan-ignore-next-line
+        return $value->$key ?? $default;
+    }
+}