Simplify testing arrays exact contents

Instead of testing the contents of each element, we can test the whole
array at once.

spec/helpers/geozones_helper_spec.rb

@@ -24,10 +24,7 @@ describe GeozonesHelper do
 
       select_options = geozone_select_options
 
-      expect(select_options.size).to eq 3
-      expect(select_options.first).to eq [g1.name, g1.id]
-      expect(select_options[1]).to eq [g2.name, g2.id]
-      expect(select_options.last).to eq [g3.name, g3.id]
+      expect(select_options).to eq [[g1.name, g1.id], [g2.name, g2.id], [g3.name, g3.id]]
     end
   end