FEATURE: Ability to clear a user's penalty history

You can do this manually if you want to allow them to reach TL3 without
their penalty history counting against them.

spec/requests/admin/users_controller_spec.rb

@@ -47,4 +47,42 @@ RSpec.describe Admin::UsersController do
       end
     end
   end
+
+  describe "#penalty_history" do
+    let(:moderator) { Fabricate(:moderator) }
+    let(:logger) { StaffActionLogger.new(admin) }
+
+    it "doesn't allow moderators to clear a user's history" do
+      sign_in(moderator)
+      delete "/admin/users/#{user.id}/penalty_history.json"
+      expect(response.code).to eq("404")
+    end
+
+    def find_logs(action)
+      UserHistory.where(target_user_id: user.id, action: UserHistory.actions[action])
+    end
+
+    it "allows admins to clear a user's history" do
+      logger.log_user_suspend(user, "suspend reason")
+      logger.log_user_unsuspend(user)
+      logger.log_unsilence_user(user)
+      logger.log_silence_user(user)
+
+      sign_in(admin)
+      delete "/admin/users/#{user.id}/penalty_history.json"
+      expect(response.code).to eq("200")
+
+      expect(find_logs(:suspend_user)).to be_blank
+      expect(find_logs(:unsuspend_user)).to be_blank
+      expect(find_logs(:silence_user)).to be_blank
+      expect(find_logs(:unsilence_user)).to be_blank
+
+      expect(find_logs(:removed_suspend_user)).to be_present
+      expect(find_logs(:removed_unsuspend_user)).to be_present
+      expect(find_logs(:removed_silence_user)).to be_present
+      expect(find_logs(:removed_unsilence_user)).to be_present
+    end
+
+  end
+
 end