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-rw-r--r--test/logger/test_logdevice.rb1
-rw-r--r--test/logger/test_logger.rb1
-rw-r--r--test/logger/test_severity.rb1
3 files changed, 3 insertions, 0 deletions
diff --git a/test/logger/test_logdevice.rb b/test/logger/test_logdevice.rb
index f6dcf9a5a3..8a7938984f 100644
--- a/test/logger/test_logdevice.rb
+++ b/test/logger/test_logdevice.rb
@@ -1,4 +1,5 @@
# coding: US-ASCII
+# frozen_string_literal: false
require 'test/unit'
require 'logger'
require 'tempfile'
diff --git a/test/logger/test_logger.rb b/test/logger/test_logger.rb
index 24a53c1f64..836d3b30f4 100644
--- a/test/logger/test_logger.rb
+++ b/test/logger/test_logger.rb
@@ -1,4 +1,5 @@
# coding: US-ASCII
+# frozen_string_literal: false
require 'test/unit'
require 'logger'
require 'tempfile'
diff --git a/test/logger/test_severity.rb b/test/logger/test_severity.rb
index 045461caa2..f17a392829 100644
--- a/test/logger/test_severity.rb
+++ b/test/logger/test_severity.rb
@@ -1,4 +1,5 @@
# coding: US-ASCII
+# frozen_string_literal: false
require 'test/unit'
require 'logger'