Inheritance: extends Illuminate\Database\Eloquent\Model
 public function testPutVoteRemove()
 {
     $this->beatmapDiscussion->vote(['score' => 1, 'user_id' => $this->user->user_id]);
     $currentVotes = BeatmapDiscussionVote::count();
     $currentScore = $this->currentScore($this->beatmapDiscussion);
     $this->actingAs($this->user)->put(route('beatmap-discussions.vote', $this->beatmapDiscussion), ['beatmap_discussion_vote' => ['score' => '0']])->assertResponseOk();
     $this->assertEquals($currentVotes - 1, BeatmapDiscussionVote::count());
     $this->assertEquals($currentScore - 1, $this->currentScore($this->beatmapDiscussion));
 }