Added failing test for full sync cache bug

Author: dktapps

tests/cached-full-sync.phpt

@@ -0,0 +1,30 @@
+--TEST--
+Test that full sync restores properties of already cached object
+--DESCRIPTION--
+pthreads_store_full_sync_local_properties() wasn't recursively syncing properties of objects which were already cached by the owning thread.
+This means that attempts to connect with dead objects would sometimes be made despite full sync taking place.
+This test verifies that the bug is fixed.
+--FILE--
+<?php
+
+$array = new \ThreadedArray();
+
+$t1 = new class($array) extends \Thread{
+	public function __construct(
+		private \ThreadedArray $array
+	){}
+
+	public function run() : void{
+		$this->array[] = new \ThreadedArray();
+	}
+};
+$t1->start() && $t1->join();
+
+var_dump($array);
+?>
+--EXPECT--
+object(ThreadedArray)#1 (1) {
+  [0]=>
+  object(ThreadedArray)#3 (0) {
+  }
+}