/**
  * @test
  */
 public function it_happend_to_an_activity()
 {
     $id = ActivityId::generate();
     $event = new ActivityCategorized($id, Activity::SOCIAL);
     $this->assertEquals($id, $event->activityId());
     $this->assertEquals(Activity::SOCIAL, $event->category());
 }
 protected function applyActivityCategorized(ActivityCategorized $event)
 {
     $this->category = $event->category();
 }