Ensure milestone counts work with no data

Commit originally written by @smcgivern

app/helpers/milestones_helper.rb

@@ -40,10 +40,11 @@ module MilestonesHelper
   # and we need to add the total
   def milestone_counts(milestones)
     counts = milestones.reorder(nil).group(:state).count
+
     {
-      opened: counts['active'],
-      closed: counts['closed'],
-      all: counts.values.sum
+      opened: counts['active'] || 0,
+      closed: counts['closed'] || 0,
+      all: counts.values.sum || 0
     }
   end
 

spec/helpers/milestones_helper_spec.rb

@@ -3,33 +3,31 @@ require 'spec_helper'
 describe MilestonesHelper do
   describe '#milestone_counts' do
     let(:project) { FactoryGirl.create(:project) }
+    let(:counts) { helper.milestone_counts(project.milestones) }
+
+    context 'when there are milestones' do
       let!(:milestone_1) { FactoryGirl.create(:active_milestone, project: project) }
       let!(:milestone_2) { FactoryGirl.create(:active_milestone, project: project) }
       let!(:milestone_3) { FactoryGirl.create(:closed_milestone, project: project) }
 
-    let(:counts) { helper.milestone_counts(project.milestones) }
-
-    it 'returns a hash containing three items' do
-      expect(counts.length).to eq 3
+      it 'returns the correct counts' do
+        expect(counts).to eq(opened: 2, closed: 1, all: 3)
       end
-
-    it 'returns a hash containing "opened" key' do
-      expect(counts.has_key?(:opened)).to eq true
     end
 
-    it 'returns a hash containing "closed" key' do
-      expect(counts.has_key?(:closed)).to eq true
-    end
+    context 'when there are only milestones of one type' do
+      let!(:milestone_1) { FactoryGirl.create(:active_milestone, project: project) }
+      let!(:milestone_2) { FactoryGirl.create(:active_milestone, project: project) }
 
-    it 'returns a hash containing "all" key' do
-      expect(counts.has_key?(:all)).to eq true
+      it 'returns the correct counts' do
+        expect(counts).to eq(opened: 2, closed: 0, all: 2)
+      end
     end
 
-    it 'shows "all" object is the sum of "opened" and "closed" objects' do
-      puts counts.as_json
-      total = counts[:opened] + counts[:closed]
-      expect(counts[:all]).to eq total
+    context 'when there are no milestones' do
+      it 'returns the correct counts' do
+        expect(counts).to eq(opened: 0, closed: 0, all: 0)
+      end
     end
   end
 end
-  
\ No newline at end of file