Add tests to ensure correct pluralization

spec/integrity/i18n_spec.rb

@@ -58,7 +58,7 @@ describe "i18n integrity checks" do
     end
   end
 
-  describe 'keys in English locale files' do
+  describe 'English locale file' do
     locale_files = ['config/locales', 'plugins/**/locales']
                      .product(['server.en.yml', 'client.en.yml'])
                      .collect { |dir, filename| Dir["#{Rails.root}/#{dir}/#{filename}"] }
@@ -85,12 +85,42 @@ describe "i18n integrity checks" do
       end
     end
 
+    module Pluralizations
+      def self.load(path)
+        whitelist = Regexp.union([/messages.restrict_dependent_destroy/])
+
+        yaml = YAML.load_file("#{Rails.root}/#{path}")
+        pluralizations = find_pluralizations(yaml['en'])
+        pluralizations.reject! { |key| key.match(whitelist) }
+        pluralizations
+      end
+
+      def self.find_pluralizations(hash, parent_key = '', pluralizations = Hash.new)
+        hash.each do |key, value|
+          if value.is_a? Hash
+            current_key = parent_key.blank? ? key : "#{parent_key}.#{key}"
+            find_pluralizations(value, current_key, pluralizations)
+          elsif key == 'one' || key == 'other'
+            pluralizations[parent_key] = hash
+          end
+        end
+
+        pluralizations
+      end
+    end
+
     locale_files.each do |path|
       context path do
         it 'has no duplicate keys' do
           duplicates = DuplicateKeyFinder.new.find_duplicates("#{Rails.root}/#{path}")
           expect(duplicates).to be_empty
         end
+
+        Pluralizations.load(path).each do |key, values|
+          it "key '#{key}' has valid pluralizations" do
+            expect(values.keys).to contain_exactly('one', 'other')
+          end
+        end
       end
     end
   end