Added a test for CommonJS modules.

tests/commonjs_modules.phpt

@@ -0,0 +1,33 @@
+--TEST--
+Test V8Js::setModuleLoader : CommonJS modules
+--SKIPIF--
+<?php require_once(dirname(__FILE__) . '/skipif.inc'); ?>
+--FILE--
+<?php
+
+$JS = <<< EOT
+require("path/to/module1");
+EOT;
+
+$v8 = new V8Js();
+$v8->setModuleLoader(function($module) {
+  switch ($module) {
+    case 'path/to/module1':
+      return 'print(' . json_encode($module . PHP_EOL) . ');require("./module2");';
+
+    case 'path/to/module2':
+      return 'print(' . json_encode($module . PHP_EOL) . ');require("../../module3");';
+
+    default:
+      return 'print(' . json_encode($module . PHP_EOL) . ');';
+  }
+});
+
+$v8->executeString($JS, 'module.js');
+?>
+===EOF===
+--EXPECT--
+path/to/module1
+path/to/module2
+module3
+===EOF===