Add test for income group

spec/presenters/analyze/presenter_spec.rb

@@ -386,10 +386,9 @@ describe Analyze::Presenter do
         presenter = Analyze::Presenter.new(params:, school:, academic_year:)
         expect(presenter.group.slug).to eq "race"
 
-        # Not yet implemented
+        params = {group: "income"}
-        # params = { group: 'income' }
+        presenter = Analyze::Presenter.new(params:, school:, academic_year:)
-        # presenter = Analyze::Presenter.new(params:, school:, academic_year:)
+        expect(presenter.group.slug).to eq "income"
-        # expect(presenter.group.slug).to eq 'income'
       end
     end