Created a failing test case

tests/Composer/Test/Package/Loader/ValidatingArrayLoaderTest.php

@@ -47,7 +47,7 @@ class ValidatingArrayLoaderTest extends \PHPUnit_Framework_TestCase
                     'description' => 'Foo bar',
                     'version' => '1.0.0',
                     'type' => 'library',
-                    'keywords' => array('a', 'b_c', 'D E'),
+                    'keywords' => array('a', 'b_c', 'D E', 'éîüø', '微信'),
                     'homepage' => 'https://foo.com',
                     'time' => '2010-10-10T10:10:10+00:00',
                     'license' => 'MIT',