diff --git a/lib/Alchemy/Phrasea/Core/Provider/ManipulatorServiceProvider.php b/lib/Alchemy/Phrasea/Core/Provider/ManipulatorServiceProvider.php
index 1508a8f1e3..b75c97ea6f 100644
--- a/lib/Alchemy/Phrasea/Core/Provider/ManipulatorServiceProvider.php
+++ b/lib/Alchemy/Phrasea/Core/Provider/ManipulatorServiceProvider.php
@@ -34,7 +34,7 @@ class ManipulatorServiceProvider implements ServiceProviderInterface
     public function register(SilexApplication $app)
     {
         $app['manipulator.task'] = $app->share(function (SilexApplication $app) {
-            return new TaskManipulator($app['orm.em'], $app['task-manager.notifier'], $app['translator']);
+            return new TaskManipulator($app['orm.em'], $app['translator'], $app['task-manager.notifier']);
         });
 
         $app['manipulator.user'] = $app->share(function ($app) {
diff --git a/lib/Alchemy/Phrasea/Model/Manipulator/TaskManipulator.php b/lib/Alchemy/Phrasea/Model/Manipulator/TaskManipulator.php
index 0d5d02e5cd..5b2a78ffd6 100644
--- a/lib/Alchemy/Phrasea/Model/Manipulator/TaskManipulator.php
+++ b/lib/Alchemy/Phrasea/Model/Manipulator/TaskManipulator.php
@@ -14,25 +14,31 @@ namespace Alchemy\Phrasea\Model\Manipulator;
 use Alchemy\Phrasea\Exception\RuntimeException;
 use Alchemy\Phrasea\Model\Entities\Task;
 use Alchemy\Phrasea\TaskManager\Job\EmptyCollectionJob;
-use Alchemy\Phrasea\TaskManager\Notifier;
+use Alchemy\Phrasea\TaskManager\NotifierInterface;
+use Alchemy\Phrasea\TaskManager\NullNotifier;
 use Doctrine\Common\Persistence\ObjectManager;
-use Doctrine\ORM\EntityRepository;
 use Symfony\Component\Translation\TranslatorInterface;
 
 class TaskManipulator implements ManipulatorInterface
 {
-    /** @var Notifier */
+    /** @var NotifierInterface */
     private $notifier;
     /** @var ObjectManager */
     private $om;
     /** @var TranslatorInterface */
     private $translator;
 
-    public function __construct(ObjectManager $om, Notifier $notifier, TranslatorInterface $translator)
+    public function __construct(ObjectManager $om, TranslatorInterface $translator, NotifierInterface $notifier=null)
     {
         $this->om = $om;
-        $this->notifier = $notifier;
         $this->translator = $translator;
+        $this->setNotifier($notifier);
+    }
+
+    public function setNotifier(NotifierInterface $notifier=null)
+    {
+        $this->notifier = $notifier ?: new NullNotifier();
+        return $this;
     }
 
     /**
@@ -56,7 +62,7 @@ class TaskManipulator implements ManipulatorInterface
         $this->om->persist($task);
         $this->om->flush();
 
-        $this->notify(Notifier::MESSAGE_CREATE);
+        $this->notify(NotifierInterface::MESSAGE_CREATE);
 
         return $task;
     }
@@ -83,7 +89,7 @@ class TaskManipulator implements ManipulatorInterface
         $this->om->persist($task);
         $this->om->flush();
 
-        $this->notify(Notifier::MESSAGE_CREATE);
+        $this->notify(NotifierInterface::MESSAGE_CREATE);
 
         return $task;
     }
@@ -100,7 +106,7 @@ class TaskManipulator implements ManipulatorInterface
         $this->om->persist($task);
         $this->om->flush();
 
-        $this->notify(Notifier::MESSAGE_UPDATE);
+        $this->notify(NotifierInterface::MESSAGE_UPDATE);
 
         return $task;
     }
@@ -115,7 +121,7 @@ class TaskManipulator implements ManipulatorInterface
         $this->om->remove($task);
         $this->om->flush();
 
-        $this->notify(Notifier::MESSAGE_DELETE);
+        $this->notify(NotifierInterface::MESSAGE_DELETE);
     }
 
     /**
@@ -132,7 +138,7 @@ class TaskManipulator implements ManipulatorInterface
         $this->om->persist($task);
         $this->om->flush();
 
-        $this->notify(Notifier::MESSAGE_UPDATE);
+        $this->notify(NotifierInterface::MESSAGE_UPDATE);
 
         return $task;
     }
@@ -151,7 +157,7 @@ class TaskManipulator implements ManipulatorInterface
         $this->om->persist($task);
         $this->om->flush();
 
-        $this->notify(Notifier::MESSAGE_UPDATE);
+        $this->notify(NotifierInterface::MESSAGE_UPDATE);
 
         return $task;
     }
@@ -170,7 +176,7 @@ class TaskManipulator implements ManipulatorInterface
         $this->om->persist($task);
         $this->om->flush();
 
-        $this->notify(Notifier::MESSAGE_UPDATE);
+        $this->notify(NotifierInterface::MESSAGE_UPDATE);
 
         return $task;
     }
diff --git a/lib/Alchemy/Phrasea/TaskManager/LiveInformation.php b/lib/Alchemy/Phrasea/TaskManager/LiveInformation.php
index 459034255d..192bf5660b 100644
--- a/lib/Alchemy/Phrasea/TaskManager/LiveInformation.php
+++ b/lib/Alchemy/Phrasea/TaskManager/LiveInformation.php
@@ -19,7 +19,7 @@ class LiveInformation
     private $status;
     private $notifier;
 
-    public function __construct(TaskManagerStatus $status, Notifier $notifier)
+    public function __construct(TaskManagerStatus $status, NotifierInterface $notifier)
     {
         $this->status = $status;
         $this->notifier = $notifier;
@@ -87,7 +87,7 @@ class LiveInformation
     private function query($throwException)
     {
         try {
-            return $this->notifier->notify(Notifier::MESSAGE_INFORMATIONS);
+            return $this->notifier->notify(NotifierInterface::MESSAGE_INFORMATION);
         } catch (RuntimeException $e) {
             if ($throwException) {
                 throw $e;
diff --git a/lib/Alchemy/Phrasea/TaskManager/Notifier.php b/lib/Alchemy/Phrasea/TaskManager/Notifier.php
index e60f4eaf0c..ef3816e8ad 100644
--- a/lib/Alchemy/Phrasea/TaskManager/Notifier.php
+++ b/lib/Alchemy/Phrasea/TaskManager/Notifier.php
@@ -16,17 +16,8 @@ use Alchemy\Phrasea\Exception\RuntimeException;
 use Alchemy\Phrasea\Exception\InvalidArgumentException;
 use Psr\Log\LoggerInterface;
 
-class Notifier
+class Notifier implements NotifierInterface
 {
-    /** Alerts the task manager a new Task has been created */
-    const MESSAGE_CREATE = 'create';
-    /** Alerts the task manager a Task has been updated */
-    const MESSAGE_UPDATE = 'update';
-    /** Alerts the task manager a Task has been deleted */
-    const MESSAGE_DELETE = 'delete';
-    /** Alerts the task manager to send its informations data */
-    const MESSAGE_INFORMATIONS = 'informations';
-
     /** @var \ZMQSocket */
     private $socket;
 
@@ -98,7 +89,7 @@ class Notifier
             case static::MESSAGE_UPDATE:
             case static::MESSAGE_DELETE:
                 return TaskManager::MESSAGE_PROCESS_UPDATE;
-            case static::MESSAGE_INFORMATIONS:
+            case static::MESSAGE_INFORMATION:
                 return TaskManager::MESSAGE_STATE;
             default:
                 throw new InvalidArgumentException(sprintf('Unable to understand %s message notification', $message));
diff --git a/lib/Alchemy/Phrasea/TaskManager/NotifierInterface.php b/lib/Alchemy/Phrasea/TaskManager/NotifierInterface.php
new file mode 100644
index 0000000000..4808a727c9
--- /dev/null
+++ b/lib/Alchemy/Phrasea/TaskManager/NotifierInterface.php
@@ -0,0 +1,33 @@
+<?php
+/*
+ * This file is part of Phraseanet
+ *
+ * (c) 2005-2015 Alchemy
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Alchemy\Phrasea\TaskManager;
+
+
+interface NotifierInterface
+{
+    /** Alerts the task manager a new Task has been created */
+    const MESSAGE_CREATE = 'create';
+    /** Alerts the task manager a Task has been updated */
+    const MESSAGE_UPDATE = 'update';
+    /** Alerts the task manager a Task has been deleted */
+    const MESSAGE_DELETE = 'delete';
+    /** Alerts the task manager to send its information data */
+    const MESSAGE_INFORMATION = 'information';
+
+    /**
+     * Notifies the task manager given a message constant, see MESSAGE_* constants.
+     *
+     * @param string $message
+     *
+     * @return mixed|null The return value of the task manager.
+     */
+    public function notify($message);
+}
diff --git a/lib/Alchemy/Phrasea/TaskManager/NullNotifier.php b/lib/Alchemy/Phrasea/TaskManager/NullNotifier.php
new file mode 100644
index 0000000000..46f4834813
--- /dev/null
+++ b/lib/Alchemy/Phrasea/TaskManager/NullNotifier.php
@@ -0,0 +1,20 @@
+<?php
+/*
+ * This file is part of Phraseanet
+ *
+ * (c) 2005-2015 Alchemy
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Alchemy\Phrasea\TaskManager;
+
+
+class NullNotifier implements NotifierInterface
+{
+    public function notify($message)
+    {
+        // Do nothing
+    }
+}
diff --git a/tests/Alchemy/Tests/Phrasea/Model/Manipulator/TaskManipulatorTest.php b/tests/Alchemy/Tests/Phrasea/Model/Manipulator/TaskManipulatorTest.php
index cb63e1a098..95775e5fb9 100644
--- a/tests/Alchemy/Tests/Phrasea/Model/Manipulator/TaskManipulatorTest.php
+++ b/tests/Alchemy/Tests/Phrasea/Model/Manipulator/TaskManipulatorTest.php
@@ -3,13 +3,13 @@
 namespace Alchemy\Tests\Phrasea\Model\Manipulator;
 
 use Alchemy\Phrasea\Model\Manipulator\TaskManipulator;
-use Alchemy\Phrasea\TaskManager\Notifier;
+use Alchemy\Phrasea\TaskManager\NotifierInterface;
 use Alchemy\Phrasea\Model\Entities\Task;
 use Doctrine\Common\Persistence\ObjectManager;
 
 class TaskManipulatorTest extends \PhraseanetTestCase
 {
-    /** @var Notifier|\PHPUnit_Framework_MockObject_MockObject */
+    /** @var NotifierInterface|\PHPUnit_Framework_MockObject_MockObject */
     private $notifier;
 
     /** @var TaskManipulator */
@@ -20,7 +20,7 @@ class TaskManipulatorTest extends \PhraseanetTestCase
         parent::setUp();
         $this->notifier = $this->createNotifierMock();
 
-        $this->sut = new TaskManipulator(self::$DI['app']['orm.em'], $this->notifier, self::$DI['app']['translator']);
+        $this->sut = new TaskManipulator(self::$DI['app']['orm.em'], self::$DI['app']['translator'], $this->notifier);
     }
 
     public function testCreate()
@@ -28,7 +28,7 @@ class TaskManipulatorTest extends \PhraseanetTestCase
         $this->notifier
             ->expects($this->once())
             ->method('notify')
-            ->with(Notifier::MESSAGE_CREATE);
+            ->with(NotifierInterface::MESSAGE_CREATE);
 
         $this->assertCount(2, $this->findAllTasks());
 
@@ -49,7 +49,7 @@ class TaskManipulatorTest extends \PhraseanetTestCase
         $this->notifier
             ->expects($this->once())
             ->method('notify')
-            ->with(Notifier::MESSAGE_UPDATE);
+            ->with(NotifierInterface::MESSAGE_UPDATE);
 
         $task = $this->loadTask();
         $task->setName('new name');
@@ -64,7 +64,7 @@ class TaskManipulatorTest extends \PhraseanetTestCase
         $this->notifier
             ->expects($this->once())
             ->method('notify')
-            ->with(Notifier::MESSAGE_DELETE);
+            ->with(NotifierInterface::MESSAGE_DELETE);
 
         $task = $this->loadTask();
         $this->sut->delete($task);
@@ -76,7 +76,7 @@ class TaskManipulatorTest extends \PhraseanetTestCase
         $this->notifier
             ->expects($this->once())
             ->method('notify')
-            ->with(Notifier::MESSAGE_UPDATE);
+            ->with(NotifierInterface::MESSAGE_UPDATE);
 
         $task = $this->loadTask();
         $task->setStatus(Task::STATUS_STOPPED);
@@ -92,7 +92,7 @@ class TaskManipulatorTest extends \PhraseanetTestCase
         $this->notifier
             ->expects($this->once())
             ->method('notify')
-            ->with(Notifier::MESSAGE_UPDATE);
+            ->with(NotifierInterface::MESSAGE_UPDATE);
 
         $task = $this->loadTask();
         $task->setStatus(Task::STATUS_STARTED);
@@ -109,7 +109,7 @@ class TaskManipulatorTest extends \PhraseanetTestCase
         $this->notifier
             ->expects($this->once())
             ->method('notify')
-            ->with(Notifier::MESSAGE_UPDATE);
+            ->with(NotifierInterface::MESSAGE_UPDATE);
 
         $task = $this->loadTask();
         $task->setCrashed(42);
@@ -137,6 +137,14 @@ class TaskManipulatorTest extends \PhraseanetTestCase
         $this->assertEquals(42, (int) $settings->bas_id);
     }
 
+    public function testItsNotifierCanBeChanged()
+    {
+        $notifier = $this->createNotifierMock();
+
+        $this->assertSame($this->sut, $this->sut->setNotifier($notifier));
+        $this->assertAttributeSame($notifier, 'notifier', $this->sut);
+    }
+
     /**
      * @return Task[]
      */
@@ -162,8 +170,6 @@ class TaskManipulatorTest extends \PhraseanetTestCase
      */
     private function createNotifierMock()
     {
-        return $this->getMockBuilder(Notifier::class)
-            ->disableOriginalConstructor()
-            ->getMock();
+        return $this->getMockBuilder(NotifierInterface::class)->getMock();
     }
 }
diff --git a/tests/Alchemy/Tests/Phrasea/TaskManager/LiveInformationTest.php b/tests/Alchemy/Tests/Phrasea/TaskManager/LiveInformationTest.php
index 81ef0d4365..9c31666524 100644
--- a/tests/Alchemy/Tests/Phrasea/TaskManager/LiveInformationTest.php
+++ b/tests/Alchemy/Tests/Phrasea/TaskManager/LiveInformationTest.php
@@ -3,7 +3,7 @@
 namespace Alchemy\Tests\Phrasea\TaskManager;
 
 use Alchemy\Phrasea\TaskManager\LiveInformation;
-use Alchemy\Phrasea\TaskManager\Notifier;
+use Alchemy\Phrasea\TaskManager\NotifierInterface;
 use Alchemy\Phrasea\TaskManager\TaskManagerStatus;
 use Alchemy\Phrasea\Model\Entities\Task;
 
@@ -14,7 +14,7 @@ class LiveInformationTest extends \PhraseanetTestCase
         $notifier = $this->createNotifierMock();
         $notifier->expects($this->once())
                 ->method('notify')
-                ->with(Notifier::MESSAGE_INFORMATIONS)
+                ->with(NotifierInterface::MESSAGE_INFORMATION)
                 ->will($this->returnValue([
                     'manager' => [
                         'process-id' => 1234,
@@ -35,7 +35,7 @@ class LiveInformationTest extends \PhraseanetTestCase
         $notifier = $this->createNotifierMock();
         $notifier->expects($this->once())
                 ->method('notify')
-                ->with(Notifier::MESSAGE_INFORMATIONS)
+                ->with(NotifierInterface::MESSAGE_INFORMATION)
                 ->will($this->returnValue(null));
 
         $live = new LiveInformation($this->createStatusMock(TaskManagerStatus::STATUS_STARTED), $notifier);
@@ -54,7 +54,7 @@ class LiveInformationTest extends \PhraseanetTestCase
         $notifier = $this->createNotifierMock();
         $notifier->expects($this->once())
                 ->method('notify')
-                ->with(Notifier::MESSAGE_INFORMATIONS)
+                ->with(NotifierInterface::MESSAGE_INFORMATION)
                 ->will($this->returnValue([
                     'manager' => [
                         'process-id' => 1234,
@@ -83,7 +83,7 @@ class LiveInformationTest extends \PhraseanetTestCase
         $notifier = $this->createNotifierMock();
         $notifier->expects($this->once())
                 ->method('notify')
-                ->with(Notifier::MESSAGE_INFORMATIONS)
+                ->with(NotifierInterface::MESSAGE_INFORMATION)
                 ->will($this->returnValue(null));
 
         $live = new LiveInformation($this->createStatusMock(TaskManagerStatus::STATUS_STARTED), $notifier);
@@ -109,8 +109,6 @@ class LiveInformationTest extends \PhraseanetTestCase
 
     private function createNotifierMock()
     {
-        return $this->getMockBuilder('Alchemy\Phrasea\TaskManager\Notifier')
-            ->disableOriginalConstructor()
-            ->getMock();
+        return $this->getMock(NotifierInterface::class);
     }
 }
diff --git a/tests/Alchemy/Tests/Phrasea/TaskManager/NotifierTest.php b/tests/Alchemy/Tests/Phrasea/TaskManager/NotifierTest.php
index ad213d8207..290d90ae50 100644
--- a/tests/Alchemy/Tests/Phrasea/TaskManager/NotifierTest.php
+++ b/tests/Alchemy/Tests/Phrasea/TaskManager/NotifierTest.php
@@ -2,27 +2,51 @@
 
 namespace Alchemy\Tests\Phrasea\TaskManager;
 
-use Alchemy\TaskManager\TaskManager;
+use Alchemy\Phrasea\Exception\RuntimeException;
 use Alchemy\Phrasea\TaskManager\Notifier;
+use Alchemy\Phrasea\TaskManager\NotifierInterface;
+use Alchemy\TaskManager\TaskManager;
+use Psr\Log\LoggerInterface;
 
-class NotifierTest extends \PhraseanetTestCase
+class NotifierTest extends \PHPUnit_Framework_TestCase
 {
+    /** @var \ZMQSocket|\PHPUnit_Framework_MockObject_MockObject */
+    private $socket;
+    /** @var LoggerInterface|\PHPUnit_Framework_MockObject_MockObject */
+    private $logger;
+
+    /** @var Notifier */
+    private $sut;
+
+    protected function setUp()
+    {
+        $this->socket = $this->createSocketMock();
+        $this->logger = $this->getMock(LoggerInterface::class);
+
+        $this->sut = new Notifier($this->socket, $this->logger);
+    }
+
+    public function testItImplementsNotifierInterface()
+    {
+        $this->assertInstanceOf(NotifierInterface::class, $this->sut);
+    }
+
     /**
      * @dataProvider provideMessagesData
      */
     public function testNotify($message, $expectedCommand, $result, $expectedReturnValue)
     {
-        $socket = $this->createSocketMock();
-        $socket->expects($this->once())
-                ->method('send')
-                ->with($expectedCommand);
+        $this->socket
+            ->expects($this->once())
+            ->method('send')
+            ->with($expectedCommand);
 
-        $socket->expects($this->once())
-                ->method('recv')
-                ->will($this->returnValue($result));
+        $this->socket
+            ->expects($this->once())
+            ->method('recv')
+            ->will($this->returnValue($result));
 
-        $notifier = new Notifier($socket, $this->getMock('Psr\Log\LoggerInterface'));
-        $this->assertEquals($expectedReturnValue, $notifier->notify($message));
+        $this->assertEquals($expectedReturnValue, $this->sut->notify($message));
     }
 
     public function provideMessagesData()
@@ -33,66 +57,62 @@ class NotifierTest extends \PhraseanetTestCase
             [Notifier::MESSAGE_CREATE, TaskManager::MESSAGE_PROCESS_UPDATE, json_encode(['request' => TaskManager::MESSAGE_PROCESS_UPDATE, 'reply' => TaskManager::RESPONSE_OK]), TaskManager::RESPONSE_OK],
             [Notifier::MESSAGE_DELETE, TaskManager::MESSAGE_PROCESS_UPDATE, json_encode(['request' => TaskManager::MESSAGE_PROCESS_UPDATE, 'reply' => TaskManager::RESPONSE_OK]), TaskManager::RESPONSE_OK],
             [Notifier::MESSAGE_UPDATE, TaskManager::MESSAGE_PROCESS_UPDATE, json_encode(['request' => TaskManager::MESSAGE_PROCESS_UPDATE, 'reply' => TaskManager::RESPONSE_OK]), TaskManager::RESPONSE_OK],
-            [Notifier::MESSAGE_INFORMATIONS, TaskManager::MESSAGE_STATE, json_encode(['request' => TaskManager::MESSAGE_STATE, 'reply' => $managerData]), $managerData],
+            [Notifier::MESSAGE_INFORMATION, TaskManager::MESSAGE_STATE, json_encode(['request' => TaskManager::MESSAGE_STATE, 'reply' => $managerData]), $managerData],
         ];
     }
 
     public function testNoresultsThrowsException()
     {
-        $socket = $this->createSocketMock();
+        $this->socket
+            ->expects($this->any())
+            ->method('recv')
+            ->will($this->returnValue(false));
 
-        $socket->expects($this->any())
-                ->method('recv')
-                ->will($this->returnValue(false));
-
-        $notifier = new Notifier($socket, $this->getMock('Psr\Log\LoggerInterface'));
-        $this->setExpectedException('Alchemy\Phrasea\Exception\RuntimeException', 'Unable to retrieve information.');
-        $notifier->notify(Notifier::MESSAGE_CREATE);
+        $this->setExpectedException(RuntimeException::class, 'Unable to retrieve information.');
+        $this->sut->notify(Notifier::MESSAGE_CREATE);
     }
 
     public function testWrongJsonReturnNull()
     {
-        $socket = $this->createSocketMock();
+        $this->socket
+            ->expects($this->once())
+            ->method('recv')
+            ->will($this->returnValue('wrong json'));
 
-        $socket->expects($this->once())
-                ->method('recv')
-                ->will($this->returnValue('wrong json'));
-
-        $notifier = new Notifier($socket, $this->getMock('Psr\Log\LoggerInterface'));
-        $this->setExpectedException('Alchemy\Phrasea\Exception\RuntimeException', 'Invalid task manager response : invalid JSON.');
-        $notifier->notify(Notifier::MESSAGE_CREATE);
+        $this->setExpectedException(RuntimeException::class, 'Invalid task manager response : invalid JSON.');
+        $this->sut->notify(Notifier::MESSAGE_CREATE);
     }
 
     public function testWrongReplyReturnNull()
     {
-        $socket = $this->createSocketMock();
-        $socket->expects($this->once())
-                ->method('send')
-                ->with(TaskManager::MESSAGE_PROCESS_UPDATE);
+        $this->socket
+            ->expects($this->once())
+            ->method('send')
+            ->with(TaskManager::MESSAGE_PROCESS_UPDATE);
 
-        $socket->expects($this->once())
-                ->method('recv')
-                ->will($this->returnValue(json_encode(['request' => 'popo', 'reply' => []])));
+        $this->socket
+            ->expects($this->once())
+            ->method('recv')
+            ->will($this->returnValue(json_encode(['request' => 'popo', 'reply' => []])));
 
-        $notifier = new Notifier($socket, $this->getMock('Psr\Log\LoggerInterface'));
-        $this->setExpectedException('Alchemy\Phrasea\Exception\RuntimeException', 'Invalid task manager response : missing fields.');
-        $notifier->notify(Notifier::MESSAGE_CREATE);
+        $this->setExpectedException(RuntimeException::class, 'Invalid task manager response : missing fields.');
+        $this->sut->notify(Notifier::MESSAGE_CREATE);
     }
 
     public function testMissingRequestReturnNull()
     {
-        $socket = $this->createSocketMock();
-        $socket->expects($this->once())
-                ->method('send')
-                ->with(TaskManager::MESSAGE_PROCESS_UPDATE);
+        $this->socket
+            ->expects($this->once())
+            ->method('send')
+            ->with(TaskManager::MESSAGE_PROCESS_UPDATE);
 
-        $socket->expects($this->once())
-                ->method('recv')
-                ->will($this->returnValue(json_encode(['request' => TaskManager::MESSAGE_PROCESS_UPDATE])));
+        $this->socket
+            ->expects($this->once())
+            ->method('recv')
+            ->will($this->returnValue(json_encode(['request' => TaskManager::MESSAGE_PROCESS_UPDATE])));
 
-        $notifier = new Notifier($socket, $this->getMock('Psr\Log\LoggerInterface'));
-        $this->setExpectedException('Alchemy\Phrasea\Exception\RuntimeException', 'Invalid task manager response : missing fields.');
-        $notifier->notify(Notifier::MESSAGE_CREATE);
+        $this->setExpectedException(RuntimeException::class, 'Invalid task manager response : missing fields.');
+        $this->sut->notify(Notifier::MESSAGE_CREATE);
     }
 
     private function createSocketMock()
diff --git a/tests/Alchemy/Tests/Phrasea/TaskManager/NullNotifierTest.php b/tests/Alchemy/Tests/Phrasea/TaskManager/NullNotifierTest.php
new file mode 100644
index 0000000000..5d12a1a6c9
--- /dev/null
+++ b/tests/Alchemy/Tests/Phrasea/TaskManager/NullNotifierTest.php
@@ -0,0 +1,22 @@
+<?php
+/*
+ * This file is part of Phraseanet
+ *
+ * (c) 2005-2015 Alchemy
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Alchemy\Tests\Phrasea\TaskManager;
+
+use Alchemy\Phrasea\TaskManager\NotifierInterface;
+use Alchemy\Phrasea\TaskManager\NullNotifier;
+
+class NullNotifierTest extends \PHPUnit_Framework_TestCase
+{
+    public function testItImplementsNotifierInterface()
+    {
+        $this->assertInstanceOf(NotifierInterface::class, new NullNotifier());
+    }
+}