ko1	2017-11-07 23:23:58 +0900 (Tue, 07 Nov 2017)

  New Revision: 60699

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=60699

  Log:
    disable GC.
    
    * test/ruby/test_io.rb (test_write_no_garbage): malloc can cause GC
      and it will reduce string object counts. So disable GC during this test.

  Modified files:
    trunk/test/ruby/test_io.rb
Index: test/ruby/test_io.rb
===================================================================
--- test/ruby/test_io.rb	(revision 60698)
+++ test/ruby/test_io.rb	(revision 60699)
@@ -3651,10 +3651,15 @@ __END__ https://github.com/ruby/ruby/blob/trunk/test/ruby/test_io.rb#L3651
       ObjectSpace.count_objects(res) # creates strings on first call
       [ 'foo'.b, '*' * 24 ].each do |buf|
         with_pipe do |r, w|
-          before = ObjectSpace.count_objects(res)[:T_STRING]
-          n = w.write(buf)
-          s = w.syswrite(buf)
-          after = ObjectSpace.count_objects(res)[:T_STRING]
+          GC.disable
+          begin
+            before = ObjectSpace.count_objects(res)[:T_STRING]
+            n = w.write(buf)
+            s = w.syswrite(buf)
+            after = ObjectSpace.count_objects(res)[:T_STRING]
+          ensure
+            GC.enable
+          end
           assert_equal before, after,
             "no strings left over after write [ruby-core:78898] [Bug #13085]: #{ before } strings before write -> #{ after } strings after write"
           assert_not_predicate buf, :frozen?, 'no inadvertent freeze'

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