Add test to verify the Closure dies with the generator

Author: TimWolla

Zend/tests/generators/generator_closure_collection.phpt

@@ -0,0 +1,49 @@
+--TEST--
+The Closure object of a generator is freed when the generator is freed.
+--FILE--
+<?php
+
+$m = new WeakMap();
+
+$genFactory = function() {
+  yield 1;
+  yield 2;
+  yield 3;
+};
+
+$r = WeakReference::create($genFactory);
+$generator = $genFactory();
+unset($genFactory);
+
+var_dump($r->get());
+
+foreach ($generator as $value) var_dump($value);
+
+var_dump($r->get());
+
+unset($generator);
+
+var_dump($r->get());
+
+?>
+--EXPECTF--
+object(Closure)#%d (3) {
+  ["name"]=>
+  string(%d) "{closure:%s:%d}"
+  ["file"]=>
+  string(%d) "%s"
+  ["line"]=>
+  int(%d)
+}
+int(1)
+int(2)
+int(3)
+object(Closure)#%d (3) {
+  ["name"]=>
+  string(%d) "{closure:%s:%d}"
+  ["file"]=>
+  string(%d) "%s"
+  ["line"]=>
+  int(%d)
+}
+NULL