public function testSetGetAssignedUser()
 {
     $name = 'Testuser';
     $user = new User();
     $user->setSurname($name);
     $this->assertFalse($this->task->isAssigned());
     $this->task->assign($user);
     $this->assertEquals($name, $this->task->getAssignee()->getSurname());
     $this->assertTrue($this->task->isAssigned());
 }