Add FunctionTemplate callback weakness test

Author: pinepain

tests/V8FunctionTemplate_callback_weakness.phpt

@@ -0,0 +1,88 @@
+--TEST--
+V8\FunctionTemplate - callback weakness
+--SKIPIF--
+<?php if (!extension_loaded("v8")) {
+    print "skip";
+} ?>
+--FILE--
+<?php
+
+/** @var \Phpv8Testsuite $helper */
+$helper = require '.testsuite.php';
+
+require '.v8-helpers.php';
+$v8_helper = new PhpV8Helpers($helper);
+
+
+$isolate = new V8\Isolate();
+
+$f1 = function () {};
+$f2 = function () {};
+
+$helper->header('Functions before setting as a callback');
+debug_zval_dump($f1);
+debug_zval_dump($f2);
+
+$fnc = new \V8\FunctionTemplate($isolate, $f1);
+
+$helper->header('Functions after f1 was set as a callback');
+debug_zval_dump($f1);
+debug_zval_dump($f2);
+
+$fnc->SetCallHandler($f2);
+
+$helper->header('Functions after f2 was set as a callback');
+debug_zval_dump($f1);
+debug_zval_dump($f2);
+
+$fnc = null;
+$helper->header('Functions after function template was destroyed');
+
+debug_zval_dump($f1);
+debug_zval_dump($f2);
+
+$isolate = null;
+//for($i = 0; $i<1000; $i++) {
+//  $isolate->LowMemoryNotification();
+//}
+$helper->header('Functions after isolate was destroyed');
+
+debug_zval_dump($f1);
+debug_zval_dump($f2);
+
+
+echo 'We are done for now', PHP_EOL;
+
+?>
+--EXPECT--
+Functions before setting as a callback:
+---------------------------------------
+object(Closure)#4 (0) refcount(2){
+}
+object(Closure)#5 (0) refcount(2){
+}
+Functions after f1 was set as a callback:
+-----------------------------------------
+object(Closure)#4 (0) refcount(3){
+}
+object(Closure)#5 (0) refcount(2){
+}
+Functions after f2 was set as a callback:
+-----------------------------------------
+object(Closure)#4 (0) refcount(2){
+}
+object(Closure)#5 (0) refcount(3){
+}
+Functions after function template was destroyed:
+------------------------------------------------
+object(Closure)#4 (0) refcount(2){
+}
+object(Closure)#5 (0) refcount(3){
+}
+Functions after isolate was destroyed:
+--------------------------------------
+object(Closure)#4 (0) refcount(2){
+}
+object(Closure)#5 (0) refcount(2){
+}
+We are done for now