PHPC-732: Regression test for use-after-free with Cursor wrapped in generator

Author: jmikola

tests/cursor/bug0732-001.phpt

@@ -0,0 +1,37 @@
+--TEST--
+PHPC-732: Possible mongoc_client_t use-after-free with Cursor wrapped in generator
+--SKIPIF--
+<?php if (PHP_VERSION_ID < 50500) exit("skip PHP 5.5 is required for generators"); ?>
+<?php require __DIR__ . "/../utils/basic-skipif.inc"; CLEANUP(STANDALONE) ?>
+--FILE--
+<?php
+require_once __DIR__ . "/../utils/basic.inc";
+
+function wrapCursor(MongoDB\Driver\Cursor $cursor)
+{
+    foreach ($cursor as $key => $value) {
+        yield $key => $value;
+    }
+}
+
+$manager = new MongoDB\Driver\Manager(STANDALONE);
+
+$bulk = new MongoDB\Driver\BulkWrite();
+$bulk->insert(['_id' => 1]);
+$bulk->insert(['_id' => 2]);
+$bulk->insert(['_id' => 3]);
+$manager->executeBulkWrite(NS, $bulk);
+
+$cursor = $manager->executeQuery(NS, new MongoDB\Driver\Query([], ['batchSize' => 2]));
+$generator = wrapCursor($cursor);
+
+foreach ($generator as $value) {
+    echo "Exiting during first iteration on generator\n";
+    exit(0);
+}
+
+?>
+===DONE===
+<?php exit(0); ?>
+--EXPECT--
+Exiting during first iteration on generator