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-rw-r--r--test/ruby/test_io.rb16
1 files changed, 16 insertions, 0 deletions
diff --git a/test/ruby/test_io.rb b/test/ruby/test_io.rb
index b146e8e321c..c501edd0abb 100644
--- a/test/ruby/test_io.rb
+++ b/test/ruby/test_io.rb
@@ -3504,5 +3504,21 @@ __END__
end
end
end
+
+ def test_write_no_garbage
+ res = {}
+ 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)
+ after = ObjectSpace.count_objects(res)[:T_STRING]
+ assert_equal before, after,
+ 'no strings left over after write [ruby-core:78898] [Bug #13085]'
+ assert_not_predicate buf, :frozen?, 'no inadvertant freeze'
+ assert_equal buf.bytesize, n, 'wrote expected size'
+ end
+ end
+ end
end
end