FIX: Prevent low score flags from auto-closing a topic if the reviewable default visibility is higher than low (#9375)

app/models/topic.rb

@@ -1423,8 +1423,9 @@ class Topic < ActiveRecord::Base
 
     scores = ReviewableScore.pending
       .joins(:reviewable)
-      .where("reviewables.topic_id = ?", self.id)
-      .pluck("COUNT(DISTINCT reviewable_scores.user_id), COALESCE(SUM(reviewable_scores.score), 0.0)")
+      .where('reviewable_scores.score >= ?', Reviewable.min_score_for_priority)
+      .where('reviewables.topic_id = ?', self.id)
+      .pluck('COUNT(DISTINCT reviewable_scores.user_id), COALESCE(SUM(reviewable_scores.score), 0.0)')
       .first
 
     scores[0] >= SiteSetting.num_flaggers_to_close_topic && scores[1] >= Reviewable.score_to_auto_close_topic

spec/models/topic_spec.rb

@@ -2574,4 +2574,40 @@ describe Topic do
       expect(user.user_profile.reload.featured_topic).to eq(nil)
     end
   end
+
+  describe '#auto_close_threshold_reached?' do
+    before do
+      Reviewable.set_priorities(low: 2.0, medium: 6.0, high: 9.0)
+      SiteSetting.num_flaggers_to_close_topic = 2
+      SiteSetting.reviewable_default_visibility = 'medium'
+      SiteSetting.auto_close_topic_sensitivity = Reviewable.sensitivity[:high]
+      post = Fabricate(:post)
+      @topic = post.topic
+      @reviewable = Fabricate(:reviewable_flagged_post, target: post, topic: @topic)
+    end
+
+    it 'ignores flags with a low score' do
+      5.times do
+        @reviewable.add_score(
+          Fabricate(:user, trust_level: TrustLevel[0]),
+          PostActionType.types[:spam],
+          created_at: 1.minute.ago
+        )
+      end
+
+      expect(@topic.auto_close_threshold_reached?).to eq(false)
+    end
+
+    it 'returns true when the flags have a high score' do
+      5.times do
+        @reviewable.add_score(
+          Fabricate(:user, admin: true),
+          PostActionType.types[:spam],
+          created_at: 1.minute.ago
+        )
+      end
+
+      expect(@topic.auto_close_threshold_reached?).to eq(true)
+    end
+  end
 end