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-rw-r--r--test/psych/visitors/test_depth_first.rb1
-rw-r--r--test/psych/visitors/test_emitter.rb1
-rw-r--r--test/psych/visitors/test_to_ruby.rb1
-rw-r--r--test/psych/visitors/test_yaml_tree.rb1
4 files changed, 4 insertions, 0 deletions
diff --git a/test/psych/visitors/test_depth_first.rb b/test/psych/visitors/test_depth_first.rb
index 837c8e8c117..8072c26b579 100644
--- a/test/psych/visitors/test_depth_first.rb
+++ b/test/psych/visitors/test_depth_first.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'psych/helper'
module Psych
diff --git a/test/psych/visitors/test_emitter.rb b/test/psych/visitors/test_emitter.rb
index 780c9536931..9317855bbb3 100644
--- a/test/psych/visitors/test_emitter.rb
+++ b/test/psych/visitors/test_emitter.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'psych/helper'
module Psych
diff --git a/test/psych/visitors/test_to_ruby.rb b/test/psych/visitors/test_to_ruby.rb
index 19e5365244d..8878ea22b24 100644
--- a/test/psych/visitors/test_to_ruby.rb
+++ b/test/psych/visitors/test_to_ruby.rb
@@ -1,4 +1,5 @@
# coding: US-ASCII
+# frozen_string_literal: false
require 'psych/helper'
module Psych
diff --git a/test/psych/visitors/test_yaml_tree.rb b/test/psych/visitors/test_yaml_tree.rb
index 40702bce796..b3890bcd724 100644
--- a/test/psych/visitors/test_yaml_tree.rb
+++ b/test/psych/visitors/test_yaml_tree.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'psych/helper'
module Psych