Add test on PHP exceptions thrown by JS generators

tests/generators_from_v8_008.phpt

@@ -0,0 +1,38 @@
+--TEST--
+Test V8::executeString() : Generators V8 -> PHP (throw PHP)
+--SKIPIF--
+<?php require_once(dirname(__FILE__) . '/skipif.inc'); ?>
+--FILE--
+<?php
+
+$js = <<<EOJS
+function* TheGen() {
+  yield 23;
+  yield PHP.getValue();
+}
+
+TheGen();
+EOJS;
+
+$v8 = new V8Js();
+$v8->getValue = function() {
+    throw new \Exception('this shall not work');
+};
+$gen = $v8->executeString($js);
+
+foreach($gen as $a) {
+    var_dump($a);
+}
+
+?>
+===EOF===
+--EXPECTF--
+int(23)
+
+Fatal error: Uncaught Exception: this shall not work in %s
+Stack trace:
+#0 [internal function]: {closure}()
+#1 [internal function]: Closure->__invoke()
+#2 %s: V8Generator->next()
+#3 {main}
+  thrown in %s