add a test.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@26657 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

Author: akr

test/ruby/test_marshal.rb

@@ -428,4 +428,11 @@ def test_marshal_dump_extra_iv
     o2 = Marshal.load(m)
     assert_equal(STDIN, o.stdin)
   end
+
+  def test_marshal_encoding
+    o = ["foo".force_encoding("EUC-JP")] + [ "bar" ] * 2
+    m = Marshal.dump(o)
+    o2 = Marshal.load(m)
+    assert_equal(o, o2, "[ruby-dev:40388]")
+  end
 end