public function testInvalidCallback()
{
try {
$callback_name = null;
do {
$callback = 'invalidfunction' . md5(rand(0, 100000));
} while (ShutdownHandler::isCallable($callback, false, $callback_name));
$handler = new ShutdownHandler($callback, array());
$handler->run();
$this->assertTrue(false);
} catch (\RuntimeException $e) {
$this->assertEquals("Callback: '{$callback_name}' is not callable", $e->getMessage());
}
}
