4 files changed, 4 insertions, 0 deletions
diff --git a/test/minitest/metametameta.rb b/test/minitest/metametameta.rb
index 9ffbdb0569..a12717c8b1 100644
--- a/test/minitest/metametameta.rb
+++ b/test/minitest/metametameta.rb
@@ -1,4 +1,5 @@
 # encoding: utf-8
+# frozen_string_literal: false
 
 require 'tempfile'
 require 'stringio'
diff --git a/test/minitest/test_minitest_benchmark.rb b/test/minitest/test_minitest_benchmark.rb
index d04bb9a125..a783e684c2 100644
--- a/test/minitest/test_minitest_benchmark.rb
+++ b/test/minitest/test_minitest_benchmark.rb
@@ -1,4 +1,5 @@
 # encoding: utf-8
+# frozen_string_literal: false
 
 require 'minitest/autorun'
 require 'minitest/benchmark'
diff --git a/test/minitest/test_minitest_mock.rb b/test/minitest/test_minitest_mock.rb
index 062cda56ff..0db972674c 100644
--- a/test/minitest/test_minitest_mock.rb
+++ b/test/minitest/test_minitest_mock.rb
@@ -1,4 +1,5 @@
 # encoding: utf-8
+# frozen_string_literal: false
 
 require 'minitest/autorun'
 
diff --git a/test/minitest/test_minitest_unit.rb b/test/minitest/test_minitest_unit.rb
index 61bfe25ee3..315c36d416 100644
--- a/test/minitest/test_minitest_unit.rb
+++ b/test/minitest/test_minitest_unit.rb
@@ -1,4 +1,5 @@
 # encoding: utf-8
+# frozen_string_literal: false
 
 require 'pathname'
 require 'minitest/metametameta'