[ruby-cvs:62603] nobu:r55439 (trunk): Refine test of r55432

[nobu at ruby-lang.org]

nobu	2016-06-18 13:40:15 +0900 (Sat, 18 Jun 2016)

  New Revision: 55439

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=55439

  Log:
    Refine test of r55432
    
    * test/stringio/test_stringio.rb (test_overflow): refine the
      conditinon, try to allocate strings until the buffer is located
      in higher half address.

  Modified files:
    trunk/test/stringio/test_stringio.rb