Moved a few methods from RecordIdentifier to ActiveModel::Naming

Signed-off-by: José Valim <jose.valim@gmail.com>

activemodel/test/cases/naming_helpers_test.rb

@@ -0,0 +1,63 @@
+require 'cases/helper'
+
+class Comment
+  extend ActiveModel::Naming
+  include ActiveModel::Conversion
+
+  attr_reader :id
+  def to_key; id ? [id] : nil end
+  def save; @id = 1 end
+  def new_record?; @id.nil? end
+  def name
+    @id.nil? ? 'new comment' : "comment ##{@id}"
+  end
+end
+
+class Sheep
+  extend ActiveModel::Naming
+  include ActiveModel::Conversion
+
+  attr_reader :id
+  def to_key; id ? [id] : nil end
+  def save; @id = 1 end
+  def new_record?; @id.nil? end
+  def name
+    @id.nil? ? 'new sheep' : "sheep ##{@id}"
+  end
+end
+
+class NamingHelpersTest < Test::Unit::TestCase
+  def setup
+    @klass  = Comment
+    @record = @klass.new
+    @singular = 'comment'
+    @plural = 'comments'
+    @uncountable = Sheep
+  end
+
+  def test_singular
+    assert_equal @singular, singular(@record)
+  end
+
+  def test_singular_for_class
+    assert_equal @singular, singular(@klass)
+  end
+
+  def test_plural
+    assert_equal @plural, plural(@record)
+  end
+
+  def test_plural_for_class
+    assert_equal @plural, plural(@klass)
+  end
+
+  def test_uncountable
+    assert_equal true, uncountable?(@uncountable)
+    assert_equal false, uncountable?(@klass)
+  end
+
+  private
+    def method_missing(method, *args)
+      ActiveModel::Naming.send(method, *args)
+    end
+end