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-rw-r--r--test/ruby/test_file_exhaustive.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/test/ruby/test_file_exhaustive.rb b/test/ruby/test_file_exhaustive.rb
index 27a4760b98..d9d93444f3 100644
--- a/test/ruby/test_file_exhaustive.rb
+++ b/test/ruby/test_file_exhaustive.rb
@@ -1290,7 +1290,7 @@ class TestFileExhaustive < Test::Unit::TestCase
end;
assert_separately(["-rtimeout", "-", regular_file], "#{<<~begin}#{<<~"end;"}")
begin
- open(ARGV[0], "r") do |f|
+ open(ARGV[0], "r+") do |f|
assert_raise(Timeout::Error) do
Timeout.timeout(0.1) do
f.flock(File::LOCK_EX)