add test.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@26977 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 9 insertions, 0 deletions

diff --git a/test/ruby/test_string.rb b/test/ruby/test_string.rb
index 5d6d6d7ab8..9dd3ea90ce 100644
--- a/test/ruby/test_string.rb
+++ b/test/ruby/test_string.rb
@@ -1364,6 +1364,15 @@ class TestString < Test::Unit::TestCase
     }
   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