Merge pull request #6806 from chancancode/add_test_singularize_of_irregularity

Inflector: Added missing tests cases to ensure idempotency of singularize and pluralize

activesupport/test/inflector_test.rb

@@ -413,6 +413,16 @@ def test_clear_with_default
     end
   end
 
+  Irregularities.each do |irregularity|
+    singular, plural = *irregularity
+    ActiveSupport::Inflector.inflections do |inflect|
+      define_method("test_singularize_of_irregularity_#{singular}_should_be_the_same") do
+        inflect.irregular(singular, plural)
+        assert_equal singular, ActiveSupport::Inflector.singularize(singular)
+      end
+    end
+  end
+
   [ :all, [] ].each do |scope|
     ActiveSupport::Inflector.inflections do |inflect|
       define_method("test_clear_inflections_with_#{scope.kind_of?(Array) ? "no_arguments" : scope}") do

activesupport/test/inflector_test_cases.rb

@@ -308,5 +308,7 @@ module InflectorTestCases
     'child'  => 'children',
     'sex'    => 'sexes',
     'move'   => 'moves',
+    'cow'    => 'kine',
+    'zombie' => 'zombies',
   }
 end