add a test.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@19172 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/ruby/test_econv.rb

@@ -36,6 +36,14 @@ class TestEncodingConverter < Test::Unit::TestCase
     assert_nil(Encoding::Converter.stateless_encoding(Encoding::UTF_8))
   end
 
+  def test_stateless_encoding_iso2022jp
+    slenc = Encoding::Converter.stateless_encoding("ISO-2022-JP")
+    str = "\e$B~~\(B".force_encoding("iso-2022-jp")
+    str2 = str.encode(slenc)
+    str3 = str.encode("ISO-2022-JP")
+    assert_equal(str, str3)
+  end
+
   def test_new
     assert_kind_of(Encoding::Converter, Encoding::Converter.new("UTF-8", "EUC-JP"))
     assert_kind_of(Encoding::Converter, Encoding::Converter.new(Encoding::UTF_8, Encoding::EUC_JP))