Created new Exception to throw and modified tests

src/Symfony/Component/Workflow/EventListener/GuardListener.php

@@ -16,6 +16,7 @@ use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInt
 use Symfony\Component\Security\Core\Authorization\AuthorizationCheckerInterface;
 use Symfony\Component\Security\Core\Role\RoleHierarchyInterface;
 use Symfony\Component\Workflow\Event\GuardEvent;
+use Symfony\Component\Workflow\Exception\InvalidTokenConfigurationException;
 
 /**
  * @author Grégoire Pineau <lyrixx@lyrixx.info>
@@ -56,7 +57,7 @@ class GuardListener
         $token = $this->tokenStorage->getToken();
 
         if (null === $token) {
-            throw new \Exception('No token is set');
+            throw new InvalidTokenConfigurationException('No token is set');
         }
 
         if (null !== $this->roleHierarchy) {

src/Symfony/Component/Workflow/Exception/InvalidTokenConfigurationException.php

@@ -0,0 +1,21 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Workflow\Exception;
+
+/**
+ * Thrown by GuardListener when there is no token set, but guards are placed on a transition
+ *
+ * @author Matt Johnson <matj1985@gmail.com>
+ */
+class InvalidTokenConfigurationException extends LogicException implements ExceptionInterface
+{
+}

src/Symfony/Component/Workflow/Tests/EventListener/GuardListenerTest.php

@@ -69,12 +69,14 @@ class GuardListenerTest extends TestCase
         $this->assertTrue($event->isBlocked());
     }
 
+    /**
+     * @expectedException \Symfony\Component\Workflow\Exception\InvalidTokenConfigurationException
+     * @expectedExceptionMessage No token is set
+     */
     public function testWithNoTokenStorage()
     {
         $event = $this->createEvent();
-        $this->tokenStorage = null;
-
-        $this->expectException(\Exception::class);
+        $this->tokenStorage->setToken(null);
 
         $this->listener->onTransition($event, 'event_name_a');
     }