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-rw-r--r--test/test_tmpio.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/test/test_tmpio.rb b/test/test_tmpio.rb
index 79c9f32..5e49cce 100644
--- a/test/test_tmpio.rb
+++ b/test/test_tmpio.rb
@@ -1,6 +1,7 @@
 # -*- encoding: binary -*-
 # Copyright (C) 2009-2015 all contributors <yahns-public@yhbt.net>
 # License: GPLv3 or later (https://www.gnu.org/licenses/gpl-2.0.txt)
+# frozen_string_literal: true
 require_relative 'helper'
 
 class TestTmpIO < Testcase