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-rw-r--r--test/lib/minitest/autorun.rb1
-rw-r--r--test/lib/minitest/benchmark.rb1
-rw-r--r--test/lib/minitest/mock.rb1
-rw-r--r--test/lib/minitest/unit.rb1
4 files changed, 4 insertions, 0 deletions
diff --git a/test/lib/minitest/autorun.rb b/test/lib/minitest/autorun.rb
index 88b1e0550de..40640b2580d 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 5195fc01bc7..21f0b29d509 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 19acaff68e5..07e88113ea6 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 e67ca02cd8c..62f89e97e59 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"