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-rw-r--r--test/ruby/test_threadgroup.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/test/ruby/test_threadgroup.rb b/test/ruby/test_threadgroup.rb
index e158f5ada4..ec95bd6419 100644
--- a/test/ruby/test_threadgroup.rb
+++ b/test/ruby/test_threadgroup.rb
@@ -1,5 +1,5 @@
+# frozen_string_literal: false
require 'test/unit'
-require 'thread'
class TestThreadGroup < Test::Unit::TestCase
def test_thread_init