17 files changed, 17 insertions, 0 deletions
diff --git a/test/lib/envutil.rb b/test/lib/envutil.rb
index 2f2ec6deb6..a0b907c245 100644
--- a/test/lib/envutil.rb
+++ b/test/lib/envutil.rb
@@ -1,4 +1,5 @@
 # -*- coding: us-ascii -*-
+# frozen_string_literal: false
 require "open3"
 require "timeout"
 require_relative "find_executable"
diff --git a/test/lib/find_executable.rb b/test/lib/find_executable.rb
index 4ba9a0533e..0ddd307f8c 100644
--- a/test/lib/find_executable.rb
+++ b/test/lib/find_executable.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 require "rbconfig"
 
 module EnvUtil
diff --git a/test/lib/iseq_loader_checker.rb b/test/lib/iseq_loader_checker.rb
index db9b7678c9..675b6580d6 100644
--- a/test/lib/iseq_loader_checker.rb
+++ b/test/lib/iseq_loader_checker.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 
 begin
   require '-test-/iseq_load/iseq_load'
diff --git a/test/lib/leakchecker.rb b/test/lib/leakchecker.rb
index 98a598f365..a9bc5813c5 100644
--- a/test/lib/leakchecker.rb
+++ b/test/lib/leakchecker.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 class LeakChecker
   def initialize
     @fd_info = find_fds
diff --git a/test/lib/memory_status.rb b/test/lib/memory_status.rb
index b275db05e6..deaaeb2a1b 100644
--- a/test/lib/memory_status.rb
+++ b/test/lib/memory_status.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 module Memory
   keys = []
   vals = []
diff --git a/test/lib/minitest/autorun.rb b/test/lib/minitest/autorun.rb
index 88b1e0550d..40640b2580 100644
--- a/test/lib/minitest/autorun.rb
+++ b/test/lib/minitest/autorun.rb
@@ -1,4 +1,5 @@
 # encoding: utf-8
+# frozen_string_literal: false
 
 begin
   require 'rubygems'
diff --git a/test/lib/minitest/benchmark.rb b/test/lib/minitest/benchmark.rb
index 5195fc01bc..21f0b29d50 100644
--- a/test/lib/minitest/benchmark.rb
+++ b/test/lib/minitest/benchmark.rb
@@ -1,4 +1,5 @@
 # encoding: utf-8
+# frozen_string_literal: false
 
 require 'minitest/unit'
 
diff --git a/test/lib/minitest/mock.rb b/test/lib/minitest/mock.rb
index 19acaff68e..07e88113ea 100644
--- a/test/lib/minitest/mock.rb
+++ b/test/lib/minitest/mock.rb
@@ -1,4 +1,5 @@
 # encoding: utf-8
+# frozen_string_literal: false
 
 class MockExpectationError < StandardError; end # :nodoc:
 
diff --git a/test/lib/minitest/unit.rb b/test/lib/minitest/unit.rb
index e67ca02cd8..62f89e97e5 100644
--- a/test/lib/minitest/unit.rb
+++ b/test/lib/minitest/unit.rb
@@ -1,4 +1,5 @@
 # encoding: utf-8
+# frozen_string_literal: false
 
 require "optparse"
 require "rbconfig"
diff --git a/test/lib/profile_test_all.rb b/test/lib/profile_test_all.rb
index 08de7bb129..4496d3f780 100644
--- a/test/lib/profile_test_all.rb
+++ b/test/lib/profile_test_all.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 #
 # purpose:
 #  Profile memory usage of each tests.
diff --git a/test/lib/test/unit.rb b/test/lib/test/unit.rb
index d886f29c73..85e6d76f3d 100644
--- a/test/lib/test/unit.rb
+++ b/test/lib/test/unit.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 begin
   gem 'minitest', '< 5.0.0' if defined? Gem
 rescue Gem::LoadError
diff --git a/test/lib/test/unit/assertions.rb b/test/lib/test/unit/assertions.rb
index 201e24592a..c749384eba 100644
--- a/test/lib/test/unit/assertions.rb
+++ b/test/lib/test/unit/assertions.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 require 'minitest/unit'
 require 'pp'
 
diff --git a/test/lib/test/unit/parallel.rb b/test/lib/test/unit/parallel.rb
index 780deda5ae..6a319c3c3f 100644
--- a/test/lib/test/unit/parallel.rb
+++ b/test/lib/test/unit/parallel.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 $LOAD_PATH.unshift "#{File.dirname(__FILE__)}/../.."
 require 'test/unit'
 
diff --git a/test/lib/test/unit/testcase.rb b/test/lib/test/unit/testcase.rb
index d6ea4fd2b1..10348b5c9b 100644
--- a/test/lib/test/unit/testcase.rb
+++ b/test/lib/test/unit/testcase.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 require 'test/unit/assertions'
 
 module Test
diff --git a/test/lib/tracepointchecker.rb b/test/lib/tracepointchecker.rb
index 2d56e658ff..73631d415e 100644
--- a/test/lib/tracepointchecker.rb
+++ b/test/lib/tracepointchecker.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 module TracePointChecker
   STATE = {
     count: 0,
diff --git a/test/lib/with_different_ofs.rb b/test/lib/with_different_ofs.rb
index 76dfa6896c..164914f1d6 100644
--- a/test/lib/with_different_ofs.rb
+++ b/test/lib/with_different_ofs.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 module DifferentOFS
   module WithDifferentOFS
     def setup
diff --git a/test/lib/zombie_hunter.rb b/test/lib/zombie_hunter.rb
index 77be4dfea8..8a8fba649c 100644
--- a/test/lib/zombie_hunter.rb
+++ b/test/lib/zombie_hunter.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 module ZombieHunter
   def after_teardown
     super