minor: tests use proper naming convention. test fix 1.8.6

Rakefile

@@ -47,7 +47,7 @@ namespace :test do
   end
 
   Rake::TestTask.new(:functional) do |t|
-    t.test_files = FileList['test/test*.rb']
+    t.test_files = FileList['test/*_test.rb']
     t.verbose    = true
   end
 

test/ordered_hash_test.rb

@@ -77,7 +77,7 @@ class OrderedHashTest < Test::Unit::TestCase
   end
 
   def test_to_a_order_preserved
-    assert_equal @ordered_keys, @oh.to_a.map(&:first)
+    assert_equal @ordered_keys, @oh.to_a.map {|m| m.first}
   end
 
   def test_order_preserved_after_replace