Add placeholder for testing response rate calculation

app/models/student_response_rate_calculator.rb

@@ -18,6 +18,9 @@ class StudentResponseRateCalculator < ResponseRateCalculator
     #
     #  All methods below will need to specify a grade
 
+    grades_with_sufficient_responses.map do |grade|
+      puts "Grade: #{grade}"
+    end
     (average_responses_per_survey_item / total_possible_responses.to_f * 100).round
   end
 
@@ -52,4 +55,15 @@ class StudentResponseRateCalculator < ResponseRateCalculator
       total_responses.total_students
     end
   end
+
+  def grades_with_sufficient_responses
+    SurveyItemResponse.where(school:, academic_year:,
+                             survey_item: subcategory.survey_items.student_survey_items).where.not(grade: nil)
+                      .group(:grade)
+                      .select(:response_id)
+                      .distinct(:response_id)
+                      .count.reject do |_key, value|
+      value < 10
+    end.keys
+  end
 end

spec/models/response_rate_calculator_spec.rb

@@ -18,6 +18,11 @@ describe ResponseRateCalculator, type: :model do
     let(:insufficient_student_survey_item_1) { create(:student_survey_item, scale: sufficient_scale_1) }
     let(:sufficient_student_survey_item_2) { create(:student_survey_item, scale: sufficient_scale_2) }
 
+    context '.grades_with_sufficient_responses' do
+      pending 'implement this'
+      before :each do
+      end
+    end
     context 'when a students take a regular survey' do
       context 'when the average number of student responses per question in a subcategory is equal to the student response threshold' do
         before :each do