Sort the available mime types

app/helpers/duckrails/mocks_helper.rb

@@ -1,7 +1,7 @@
 module Duckrails
   module MocksHelper
     def available_mime_types
-      Mime::EXTENSION_LOOKUP.map{ |a| a[1].to_s }.uniq
+      Mime::EXTENSION_LOOKUP.map{ |a| a[1].to_s }.uniq.sort
     end
 
     def available_script_types

spec/helpers/duckrails/mocks_helper_spec.rb

@@ -6,7 +6,7 @@ module Duckrails
       subject { helper.send :available_mime_types }
 
       it 'should return all available mime types' do
-        expect(subject).to eq Mime::EXTENSION_LOOKUP.map{ |a| a[1].to_s }.uniq
+        expect(subject).to eq Mime::EXTENSION_LOOKUP.map{ |a| a[1].to_s }.uniq.sort
       end
 
       it 'should show the mime type' do