akr	2010-03-19 08:11:12 +0900 (Fri, 19 Mar 2010)

  New Revision: 26977

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=26977

  Log:
    add test.

  Modified files:
    trunk/test/ruby/test_string.rb

Index: test/ruby/test_string.rb
===================================================================
--- test/ruby/test_string.rb	(revision 26976)
+++ test/ruby/test_string.rb	(revision 26977)
@@ -1364,6 +1364,15 @@
     }
   end
 
+  def test_sum_long
+    s8421505 = "\xff" * 8421505
+    assert_equal(127, s8421505.sum(31))
+    assert_equal(2147483775, s8421505.sum(0))
+    s16843010 = ("\xff" * 16843010)
+    assert_equal(254, s16843010.sum(32))
+    assert_equal(4294967550, s16843010.sum(0))
+  end
+
   def test_swapcase
     assert_equal(S("hi&LOW"), S("HI&low").swapcase)
   end

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