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-rw-r--r--test/thread/test_cv.rb1
-rw-r--r--test/thread/test_queue.rb1
-rw-r--r--test/thread/test_sync.rb1
3 files changed, 3 insertions, 0 deletions
diff --git a/test/thread/test_cv.rb b/test/thread/test_cv.rb
index b399b479f46..53c7d279b43 100644
--- a/test/thread/test_cv.rb
+++ b/test/thread/test_cv.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require 'thread'
require 'tmpdir'
diff --git a/test/thread/test_queue.rb b/test/thread/test_queue.rb
index 0a1ae483870..32662babed8 100644
--- a/test/thread/test_queue.rb
+++ b/test/thread/test_queue.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require 'thread'
require 'tmpdir'
diff --git a/test/thread/test_sync.rb b/test/thread/test_sync.rb
index 9509cac6c74..e576fc1d323 100644
--- a/test/thread/test_sync.rb
+++ b/test/thread/test_sync.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require 'sync'
require 'timeout'