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-rw-r--r--mrbgems/mruby-io/test/io.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/mrbgems/mruby-io/test/io.rb b/mrbgems/mruby-io/test/io.rb
index 96c3495d0..5c737f6d0 100644
--- a/mrbgems/mruby-io/test/io.rb
+++ b/mrbgems/mruby-io/test/io.rb
@@ -216,6 +216,7 @@ assert('IO#dup for readable') do
dup = io.dup
assert_true io != dup
assert_true io.fileno != dup.fileno
+ assert_true dup.close_on_exec?
assert_equal 'm', dup.sysread(1)
assert_equal 'r', io.sysread(1)
assert_equal 'u', dup.sysread(1)