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-rw-r--r--test/digest/digest/foo.rb1
-rw-r--r--test/digest/test_digest.rb1
-rw-r--r--test/digest/test_digest_extend.rb1
3 files changed, 3 insertions, 0 deletions
diff --git a/test/digest/digest/foo.rb b/test/digest/digest/foo.rb
index d576ef00e0..6d42b003fb 100644
--- a/test/digest/digest/foo.rb
+++ b/test/digest/digest/foo.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
module Digest
Foo = nil
diff --git a/test/digest/test_digest.rb b/test/digest/test_digest.rb
index ccf0a26b90..039c1701cb 100644
--- a/test/digest/test_digest.rb
+++ b/test/digest/test_digest.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
# $RoughId: test.rb,v 1.4 2001/07/13 15:38:27 knu Exp $
# $Id$
diff --git a/test/digest/test_digest_extend.rb b/test/digest/test_digest_extend.rb
index 46158a670c..9dd026b5e3 100644
--- a/test/digest/test_digest_extend.rb
+++ b/test/digest/test_digest_extend.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require 'digest'
require_relative '../lib/with_different_ofs.rb'