3 files changed, 3 insertions, 0 deletions
diff --git a/test/erb/test_erb.rb b/test/erb/test_erb.rb
index 1f1253fd23..4e2d49a866 100644
--- a/test/erb/test_erb.rb
+++ b/test/erb/test_erb.rb
@@ -1,4 +1,5 @@
 # -*- coding: us-ascii -*-
+# frozen_string_literal: false
 require 'test/unit'
 require 'erb'
 
diff --git a/test/erb/test_erb_command.rb b/test/erb/test_erb_command.rb
index abc8fdbe25..406b14cdb3 100644
--- a/test/erb/test_erb_command.rb
+++ b/test/erb/test_erb_command.rb
@@ -1,4 +1,5 @@
 # -*- coding: us-ascii -*-
+# frozen_string_literal: false
 require 'test/unit'
 
 class TestErbCommand < Test::Unit::TestCase
diff --git a/test/erb/test_erb_m17n.rb b/test/erb/test_erb_m17n.rb
index f60dd103f6..a7840c9605 100644
--- a/test/erb/test_erb_m17n.rb
+++ b/test/erb/test_erb_m17n.rb
@@ -1,4 +1,5 @@
 # -*- coding: utf-8 -*-
+# frozen_string_literal: false
 require 'test/unit'
 require 'erb'