orders summary groups alphabetically

app/models/proposal.rb

@@ -71,7 +71,7 @@ class Proposal < ActiveRecord::Base
 
   def self.for_summary
     summary = {}
-    categories = ActsAsTaggableOn::Tag.category_names
+    categories = ActsAsTaggableOn::Tag.category_names.sort
     categories.each do |category|
       summary[category] = search(category).last_week.sort_by_confidence_score.limit(3)
     end

spec/models/proposal_spec.rb

@@ -669,7 +669,7 @@ describe Proposal do
       expect(Proposal.for_summary.values.flatten).to_not include(proposal)
     end
 
-    it "should order by votes" do
+    it "should order proposals by votes" do
       create(:tag, kind: 'category', name: 'culture')
       create(:proposal,  tag_list: 'culture').update_column(:confidence_score, 2)
       create(:proposal, tag_list: 'culture').update_column(:confidence_score, 10)
@@ -682,6 +682,22 @@ describe Proposal do
       expect(results.third.confidence_score).to  be(2)
     end
 
+    it "should order groups alphabetically" do
+      create(:tag, kind: 'category', name: 'health')
+      create(:tag, kind: 'category', name: 'culture')
+      create(:tag, kind: 'category', name: 'social services')
+
+      health_proposal  = create(:proposal,  tag_list: 'health')
+      culture_proposal = create(:proposal,  tag_list: 'culture')
+      social_proposal  = create(:proposal,  tag_list: 'social services')
+
+      results = Proposal.for_summary.values.flatten
+
+      expect(results.first).to  eq(culture_proposal)
+      expect(results.second).to eq(health_proposal)
+      expect(results.third).to  eq(social_proposal)
+    end
+
     it "should return proposals grouped by tag" do
       create(:tag, kind: 'category', name: 'culture')
       create(:tag, kind: 'category', name: 'health')