Change race score calculations so the average bubbles up through survey_items

-> scales -> measure.
Precalculate averages for performance.

spec/presenters/analyze/graph/racial_score_spec.rb

@@ -0,0 +1,46 @@
+require 'rails_helper'
+
+include Analyze::Graph::Column
+
+# RacialScore is a module used in the RaceScoreCalculator class
+describe RacialScore do
+  let(:measure) { create(:measure, :with_student_survey_items) }
+  let(:school) { create(:school) }
+  let(:academic_year) { create(:academic_year) }
+  let(:race) { create(:race) }
+  let(:student) do
+    s = create(:student)
+    s.races << race
+    s.save
+    s
+  end
+  let(:survey_item_1) { measure.survey_items[0] }
+  let(:survey_item_2) { measure.survey_items[1] }
+  let(:survey_item_3) { measure.survey_items[2] }
+  let(:response_rate) do
+    create(:response_rate, school:, academic_year:, subcategory: measure.subcategory, meets_student_threshold: true)
+  end
+
+  context 'when survey item responses exist' do
+    before :each do
+      response_rate
+      create(:survey_item_response, school:, academic_year:, likert_score: 1, survey_item: survey_item_1, student:)
+      create_list(:survey_item_response, 8, school:, academic_year:, likert_score: 2, survey_item: survey_item_1,
+                                            student:)
+      create(:survey_item_response, school:, academic_year:, likert_score: 3, survey_item: survey_item_1, student:)
+
+      create(:survey_item_response, school:, academic_year:, likert_score: 2, survey_item: survey_item_2, student:)
+      create_list(:survey_item_response, 8, school:, academic_year:, likert_score: 3, survey_item: survey_item_2,
+                                            student:)
+      create(:survey_item_response, school:, academic_year:, likert_score: 4, survey_item: survey_item_2, student:)
+    end
+
+    it 'returns a list of averages' do
+      expect(measure.student_survey_items.count).to eq 2
+      students = StudentRace.where(race:).pluck(:student_id)
+
+      american_indian_score = RaceScoreCalculator.new(measure:, school:, academic_year:, race:).score
+      expect(american_indian_score).to eq Score.new(2.5, false, true, false)
+    end
+  end
+end