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-rw-r--r--test/-ext-/array/test_resize.rb1
-rw-r--r--test/-ext-/bignum/test_big2str.rb1
-rw-r--r--test/-ext-/bignum/test_bigzero.rb1
-rw-r--r--test/-ext-/bignum/test_div.rb1
-rw-r--r--test/-ext-/bignum/test_mul.rb1
-rw-r--r--test/-ext-/bignum/test_pack.rb1
-rw-r--r--test/-ext-/bignum/test_str2big.rb1
-rw-r--r--test/-ext-/bug_reporter/test_bug_reporter.rb1
-rw-r--r--test/-ext-/class/test_class2name.rb1
-rw-r--r--test/-ext-/debug/test_debug.rb1
-rw-r--r--test/-ext-/debug/test_profile_frames.rb1
-rw-r--r--test/-ext-/exception/test_data_error.rb1
-rw-r--r--test/-ext-/exception/test_enc_raise.rb1
-rw-r--r--test/-ext-/exception/test_ensured.rb1
-rw-r--r--test/-ext-/file/test_stat.rb1
-rw-r--r--test/-ext-/float/test_nextafter.rb1
-rw-r--r--test/-ext-/funcall/test_passing_block.rb1
-rw-r--r--test/-ext-/gvl/test_last_thread.rb1
-rw-r--r--test/-ext-/hash/test_delete.rb1
-rw-r--r--test/-ext-/iseq_load/test_iseq_load.rb1
-rw-r--r--test/-ext-/iter/test_iter_break.rb1
-rw-r--r--test/-ext-/iter/test_yield_block.rb1
-rw-r--r--test/-ext-/load/test_dot_dot.rb1
-rw-r--r--test/-ext-/marshal/test_internal_ivar.rb1
-rw-r--r--test/-ext-/marshal/test_usrmarshal.rb1
-rw-r--r--test/-ext-/method/test_arity.rb1
-rw-r--r--test/-ext-/num2int/test_num2int.rb1
-rw-r--r--test/-ext-/path_to_class/test_path_to_class.rb1
-rw-r--r--test/-ext-/popen_deadlock/test_popen_deadlock.rb1
-rw-r--r--test/-ext-/postponed_job/test_postponed_job.rb1
-rw-r--r--test/-ext-/proc/test_bmethod.rb1
-rw-r--r--test/-ext-/rational/test_rat.rb1
-rw-r--r--test/-ext-/st/test_foreach.rb1
-rw-r--r--test/-ext-/st/test_numhash.rb1
-rw-r--r--test/-ext-/st/test_update.rb1
-rw-r--r--test/-ext-/string/test_coderange.rb1
-rw-r--r--test/-ext-/string/test_cstr.rb1
-rw-r--r--test/-ext-/string/test_ellipsize.rb1
-rw-r--r--test/-ext-/string/test_enc_associate.rb1
-rw-r--r--test/-ext-/string/test_enc_str_buf_cat.rb1
-rw-r--r--test/-ext-/string/test_fstring.rb1
-rw-r--r--test/-ext-/string/test_modify_expand.rb1
-rw-r--r--test/-ext-/string/test_nofree.rb1
-rw-r--r--test/-ext-/string/test_normalize.rb1
-rw-r--r--test/-ext-/string/test_qsort.rb1
-rw-r--r--test/-ext-/string/test_set_len.rb1
-rw-r--r--test/-ext-/struct/test_member.rb1
-rw-r--r--test/-ext-/symbol/test_inadvertent_creation.rb1
-rw-r--r--test/-ext-/symbol/test_type.rb1
-rw-r--r--test/-ext-/test_bug-3571.rb1
-rw-r--r--test/-ext-/test_bug-5832.rb1
-rw-r--r--test/-ext-/test_notimplement.rb1
-rw-r--r--test/-ext-/test_printf.rb1
-rw-r--r--test/-ext-/test_recursion.rb1
-rw-r--r--test/-ext-/time/test_new.rb1
-rw-r--r--test/-ext-/tracepoint/test_tracepoint.rb1
-rw-r--r--test/-ext-/typeddata/test_typeddata.rb1
-rw-r--r--test/-ext-/wait_for_single_fd/test_wait_for_single_fd.rb1
-rw-r--r--test/-ext-/win32/test_console_attr.rb1
-rw-r--r--test/-ext-/win32/test_dln.rb1
-rw-r--r--test/-ext-/win32/test_fd_setsize.rb1
61 files changed, 61 insertions, 0 deletions
diff --git a/test/-ext-/array/test_resize.rb b/test/-ext-/array/test_resize.rb
index 8e526b5a0c4..f6a368cb755 100644
--- a/test/-ext-/array/test_resize.rb
+++ b/test/-ext-/array/test_resize.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require '-test-/array/resize'
diff --git a/test/-ext-/bignum/test_big2str.rb b/test/-ext-/bignum/test_big2str.rb
index 0af552ea709..4fae24eb345 100644
--- a/test/-ext-/bignum/test_big2str.rb
+++ b/test/-ext-/bignum/test_big2str.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require "-test-/bignum"
diff --git a/test/-ext-/bignum/test_bigzero.rb b/test/-ext-/bignum/test_bigzero.rb
index f75c4590b86..8529e54456b 100644
--- a/test/-ext-/bignum/test_bigzero.rb
+++ b/test/-ext-/bignum/test_bigzero.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require "-test-/bignum"
diff --git a/test/-ext-/bignum/test_div.rb b/test/-ext-/bignum/test_div.rb
index 9c1a3c3d2a9..9a8e93b0815 100644
--- a/test/-ext-/bignum/test_div.rb
+++ b/test/-ext-/bignum/test_div.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require "-test-/bignum"
diff --git a/test/-ext-/bignum/test_mul.rb b/test/-ext-/bignum/test_mul.rb
index 3e78247aa45..103a00fbad2 100644
--- a/test/-ext-/bignum/test_mul.rb
+++ b/test/-ext-/bignum/test_mul.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require "-test-/bignum"
diff --git a/test/-ext-/bignum/test_pack.rb b/test/-ext-/bignum/test_pack.rb
index f2a3df814e0..04bf3e02de1 100644
--- a/test/-ext-/bignum/test_pack.rb
+++ b/test/-ext-/bignum/test_pack.rb
@@ -1,4 +1,5 @@
# coding: ASCII-8BIT
+# frozen_string_literal: false
require 'test/unit'
require "-test-/bignum"
diff --git a/test/-ext-/bignum/test_str2big.rb b/test/-ext-/bignum/test_str2big.rb
index 4304be88e9f..3b5750154ea 100644
--- a/test/-ext-/bignum/test_str2big.rb
+++ b/test/-ext-/bignum/test_str2big.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require "-test-/bignum"
diff --git a/test/-ext-/bug_reporter/test_bug_reporter.rb b/test/-ext-/bug_reporter/test_bug_reporter.rb
index e68adeef06f..fb37658c920 100644
--- a/test/-ext-/bug_reporter/test_bug_reporter.rb
+++ b/test/-ext-/bug_reporter/test_bug_reporter.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require 'tmpdir'
diff --git a/test/-ext-/class/test_class2name.rb b/test/-ext-/class/test_class2name.rb
index 070be5a130f..e61964d9eb7 100644
--- a/test/-ext-/class/test_class2name.rb
+++ b/test/-ext-/class/test_class2name.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require "-test-/class"
diff --git a/test/-ext-/debug/test_debug.rb b/test/-ext-/debug/test_debug.rb
index ec506e0ca52..3804714d0dc 100644
--- a/test/-ext-/debug/test_debug.rb
+++ b/test/-ext-/debug/test_debug.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require '-test-/debug'
diff --git a/test/-ext-/debug/test_profile_frames.rb b/test/-ext-/debug/test_profile_frames.rb
index e257ef09b3d..860652c0cdf 100644
--- a/test/-ext-/debug/test_profile_frames.rb
+++ b/test/-ext-/debug/test_profile_frames.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require '-test-/debug'
diff --git a/test/-ext-/exception/test_data_error.rb b/test/-ext-/exception/test_data_error.rb
index 53cbb28438f..d33d8ca43fd 100644
--- a/test/-ext-/exception/test_data_error.rb
+++ b/test/-ext-/exception/test_data_error.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
module Bug
diff --git a/test/-ext-/exception/test_enc_raise.rb b/test/-ext-/exception/test_enc_raise.rb
index a578b167ea8..2bc7f024135 100644
--- a/test/-ext-/exception/test_enc_raise.rb
+++ b/test/-ext-/exception/test_enc_raise.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require '-test-/exception'
diff --git a/test/-ext-/exception/test_ensured.rb b/test/-ext-/exception/test_ensured.rb
index 97d97941862..858245868b3 100644
--- a/test/-ext-/exception/test_ensured.rb
+++ b/test/-ext-/exception/test_ensured.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
module Bug
diff --git a/test/-ext-/file/test_stat.rb b/test/-ext-/file/test_stat.rb
index b9aa132932e..9eebcd97b9f 100644
--- a/test/-ext-/file/test_stat.rb
+++ b/test/-ext-/file/test_stat.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require "-test-/file"
diff --git a/test/-ext-/float/test_nextafter.rb b/test/-ext-/float/test_nextafter.rb
index e3a3e726c7f..c131d1e4131 100644
--- a/test/-ext-/float/test_nextafter.rb
+++ b/test/-ext-/float/test_nextafter.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require "-test-/float"
diff --git a/test/-ext-/funcall/test_passing_block.rb b/test/-ext-/funcall/test_passing_block.rb
index 87aed2212c8..fac7eaf9539 100644
--- a/test/-ext-/funcall/test_passing_block.rb
+++ b/test/-ext-/funcall/test_passing_block.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
class TestFuncall < Test::Unit::TestCase
diff --git a/test/-ext-/gvl/test_last_thread.rb b/test/-ext-/gvl/test_last_thread.rb
index cf5f28f4b61..3b297a5b311 100644
--- a/test/-ext-/gvl/test_last_thread.rb
+++ b/test/-ext-/gvl/test_last_thread.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
class TestLastThread < Test::Unit::TestCase
# [Bug #11237]
diff --git a/test/-ext-/hash/test_delete.rb b/test/-ext-/hash/test_delete.rb
index 13f35954826..e2ad3cbdbc0 100644
--- a/test/-ext-/hash/test_delete.rb
+++ b/test/-ext-/hash/test_delete.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require '-test-/hash'
diff --git a/test/-ext-/iseq_load/test_iseq_load.rb b/test/-ext-/iseq_load/test_iseq_load.rb
index 5dfd69a8634..7eb8f4bfc84 100644
--- a/test/-ext-/iseq_load/test_iseq_load.rb
+++ b/test/-ext-/iseq_load/test_iseq_load.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
class TestIseqLoad < Test::Unit::TestCase
diff --git a/test/-ext-/iter/test_iter_break.rb b/test/-ext-/iter/test_iter_break.rb
index 5bac6331fdb..8c2379960a9 100644
--- a/test/-ext-/iter/test_iter_break.rb
+++ b/test/-ext-/iter/test_iter_break.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require '-test-/iter'
diff --git a/test/-ext-/iter/test_yield_block.rb b/test/-ext-/iter/test_yield_block.rb
index bec993c9505..d4f1fa3c35a 100644
--- a/test/-ext-/iter/test_yield_block.rb
+++ b/test/-ext-/iter/test_yield_block.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require '-test-/iter'
diff --git a/test/-ext-/load/test_dot_dot.rb b/test/-ext-/load/test_dot_dot.rb
index 82aa10a95f0..1b2c8716089 100644
--- a/test/-ext-/load/test_dot_dot.rb
+++ b/test/-ext-/load/test_dot_dot.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
class Test_DotDot < Test::Unit::TestCase
diff --git a/test/-ext-/marshal/test_internal_ivar.rb b/test/-ext-/marshal/test_internal_ivar.rb
index e0e2a72f543..51529667b52 100644
--- a/test/-ext-/marshal/test_internal_ivar.rb
+++ b/test/-ext-/marshal/test_internal_ivar.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require '-test-/marshal/internal_ivar'
diff --git a/test/-ext-/marshal/test_usrmarshal.rb b/test/-ext-/marshal/test_usrmarshal.rb
index 8d8db012aca..263dcb82974 100644
--- a/test/-ext-/marshal/test_usrmarshal.rb
+++ b/test/-ext-/marshal/test_usrmarshal.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require '-test-/marshal/usr'
diff --git a/test/-ext-/method/test_arity.rb b/test/-ext-/method/test_arity.rb
index 79ef23b34ff..d0032c6a50c 100644
--- a/test/-ext-/method/test_arity.rb
+++ b/test/-ext-/method/test_arity.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require '-test-/method'
require 'test/unit'
diff --git a/test/-ext-/num2int/test_num2int.rb b/test/-ext-/num2int/test_num2int.rb
index f5796599291..c00bb56833d 100644
--- a/test/-ext-/num2int/test_num2int.rb
+++ b/test/-ext-/num2int/test_num2int.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require '-test-/num2int/num2int'
diff --git a/test/-ext-/path_to_class/test_path_to_class.rb b/test/-ext-/path_to_class/test_path_to_class.rb
index fdf4097fde1..57e3a9233a5 100644
--- a/test/-ext-/path_to_class/test_path_to_class.rb
+++ b/test/-ext-/path_to_class/test_path_to_class.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
class Test_PathToClass < Test::Unit::TestCase
diff --git a/test/-ext-/popen_deadlock/test_popen_deadlock.rb b/test/-ext-/popen_deadlock/test_popen_deadlock.rb
index 60ec6ccce43..97892e50083 100644
--- a/test/-ext-/popen_deadlock/test_popen_deadlock.rb
+++ b/test/-ext-/popen_deadlock/test_popen_deadlock.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
begin
require '-test-/popen_deadlock/infinite_loop_dlsym'
rescue LoadError
diff --git a/test/-ext-/postponed_job/test_postponed_job.rb b/test/-ext-/postponed_job/test_postponed_job.rb
index 032e35c055a..da3b579ebae 100644
--- a/test/-ext-/postponed_job/test_postponed_job.rb
+++ b/test/-ext-/postponed_job/test_postponed_job.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require 'thread'
require '-test-/postponed_job'
diff --git a/test/-ext-/proc/test_bmethod.rb b/test/-ext-/proc/test_bmethod.rb
index 16927dcf7d7..344f9757559 100644
--- a/test/-ext-/proc/test_bmethod.rb
+++ b/test/-ext-/proc/test_bmethod.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require '-test-/proc'
diff --git a/test/-ext-/rational/test_rat.rb b/test/-ext-/rational/test_rat.rb
index ef7e7fe535a..626ffb96611 100644
--- a/test/-ext-/rational/test_rat.rb
+++ b/test/-ext-/rational/test_rat.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require "-test-/rational"
diff --git a/test/-ext-/st/test_foreach.rb b/test/-ext-/st/test_foreach.rb
index 259b0a93b12..4b3eb870e48 100644
--- a/test/-ext-/st/test_foreach.rb
+++ b/test/-ext-/st/test_foreach.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require '-test-/st/foreach'
diff --git a/test/-ext-/st/test_numhash.rb b/test/-ext-/st/test_numhash.rb
index 24dc87c1d9d..97c3a755bbc 100644
--- a/test/-ext-/st/test_numhash.rb
+++ b/test/-ext-/st/test_numhash.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require "-test-/st/numhash"
diff --git a/test/-ext-/st/test_update.rb b/test/-ext-/st/test_update.rb
index 1b41d2bc03f..db86eeb8d7e 100644
--- a/test/-ext-/st/test_update.rb
+++ b/test/-ext-/st/test_update.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require "-test-/st/update"
diff --git a/test/-ext-/string/test_coderange.rb b/test/-ext-/string/test_coderange.rb
index 31f5c871f56..18b256fcea3 100644
--- a/test/-ext-/string/test_coderange.rb
+++ b/test/-ext-/string/test_coderange.rb
@@ -1,4 +1,5 @@
# coding: ascii-8bit
+# frozen_string_literal: false
require 'test/unit'
require "-test-/string"
require "rbconfig/sizeof"
diff --git a/test/-ext-/string/test_cstr.rb b/test/-ext-/string/test_cstr.rb
index 4be2cc98fa2..f4ed520b2d5 100644
--- a/test/-ext-/string/test_cstr.rb
+++ b/test/-ext-/string/test_cstr.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require "-test-/string"
diff --git a/test/-ext-/string/test_ellipsize.rb b/test/-ext-/string/test_ellipsize.rb
index 23ccdb515b2..d7947041d56 100644
--- a/test/-ext-/string/test_ellipsize.rb
+++ b/test/-ext-/string/test_ellipsize.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require "-test-/string"
diff --git a/test/-ext-/string/test_enc_associate.rb b/test/-ext-/string/test_enc_associate.rb
index 2c84f49db18..4fad8e1cc87 100644
--- a/test/-ext-/string/test_enc_associate.rb
+++ b/test/-ext-/string/test_enc_associate.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require "-test-/string"
diff --git a/test/-ext-/string/test_enc_str_buf_cat.rb b/test/-ext-/string/test_enc_str_buf_cat.rb
index c925affb419..72f903903c7 100644
--- a/test/-ext-/string/test_enc_str_buf_cat.rb
+++ b/test/-ext-/string/test_enc_str_buf_cat.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require "-test-/string"
diff --git a/test/-ext-/string/test_fstring.rb b/test/-ext-/string/test_fstring.rb
index 3ad9a4c312e..39ed0208923 100644
--- a/test/-ext-/string/test_fstring.rb
+++ b/test/-ext-/string/test_fstring.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require '-test-/string'
diff --git a/test/-ext-/string/test_modify_expand.rb b/test/-ext-/string/test_modify_expand.rb
index cc19a47b917..5eb7a02b91a 100644
--- a/test/-ext-/string/test_modify_expand.rb
+++ b/test/-ext-/string/test_modify_expand.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require "-test-/string"
diff --git a/test/-ext-/string/test_nofree.rb b/test/-ext-/string/test_nofree.rb
index cb034a4b8f6..86681e46523 100644
--- a/test/-ext-/string/test_nofree.rb
+++ b/test/-ext-/string/test_nofree.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
class Test_StringNoFree < Test::Unit::TestCase
diff --git a/test/-ext-/string/test_normalize.rb b/test/-ext-/string/test_normalize.rb
index b270a450058..8c11bfe3d42 100644
--- a/test/-ext-/string/test_normalize.rb
+++ b/test/-ext-/string/test_normalize.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require "-test-/string"
require "tempfile"
diff --git a/test/-ext-/string/test_qsort.rb b/test/-ext-/string/test_qsort.rb
index 1a6dae0124b..94aff8c3c45 100644
--- a/test/-ext-/string/test_qsort.rb
+++ b/test/-ext-/string/test_qsort.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require "-test-/string"
diff --git a/test/-ext-/string/test_set_len.rb b/test/-ext-/string/test_set_len.rb
index 198129d72ff..1c5252a5f65 100644
--- a/test/-ext-/string/test_set_len.rb
+++ b/test/-ext-/string/test_set_len.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require "-test-/string"
diff --git a/test/-ext-/struct/test_member.rb b/test/-ext-/struct/test_member.rb
index 18e98085a07..5ee0adcf676 100644
--- a/test/-ext-/struct/test_member.rb
+++ b/test/-ext-/struct/test_member.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require "-test-/struct"
diff --git a/test/-ext-/symbol/test_inadvertent_creation.rb b/test/-ext-/symbol/test_inadvertent_creation.rb
index 14afc90d740..073952fae33 100644
--- a/test/-ext-/symbol/test_inadvertent_creation.rb
+++ b/test/-ext-/symbol/test_inadvertent_creation.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require "-test-/symbol"
diff --git a/test/-ext-/symbol/test_type.rb b/test/-ext-/symbol/test_type.rb
index ddd79561ab7..32a700d2732 100644
--- a/test/-ext-/symbol/test_type.rb
+++ b/test/-ext-/symbol/test_type.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require "-test-/symbol"
diff --git a/test/-ext-/test_bug-3571.rb b/test/-ext-/test_bug-3571.rb
index d7c26d1ff0f..dc9c92bd233 100644
--- a/test/-ext-/test_bug-3571.rb
+++ b/test/-ext-/test_bug-3571.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
class Test_BUG_3571 < Test::Unit::TestCase
diff --git a/test/-ext-/test_bug-5832.rb b/test/-ext-/test_bug-5832.rb
index 11f8a52a95c..6812e64e5e5 100644
--- a/test/-ext-/test_bug-5832.rb
+++ b/test/-ext-/test_bug-5832.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require '-test-/bug-5832/bug'
class Test_BUG_5832 < Test::Unit::TestCase
diff --git a/test/-ext-/test_notimplement.rb b/test/-ext-/test_notimplement.rb
index 7394126fb16..0eba7bdaf8c 100644
--- a/test/-ext-/test_notimplement.rb
+++ b/test/-ext-/test_notimplement.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require '-test-/notimplement'
class TestNotImplement < Test::Unit::TestCase
diff --git a/test/-ext-/test_printf.rb b/test/-ext-/test_printf.rb
index 1f06ad6300c..4e4f5b46951 100644
--- a/test/-ext-/test_printf.rb
+++ b/test/-ext-/test_printf.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require "-test-/printf"
require_relative '../ruby/allpairs'
diff --git a/test/-ext-/test_recursion.rb b/test/-ext-/test_recursion.rb
index 06faf6dc7a5..db7a8539886 100644
--- a/test/-ext-/test_recursion.rb
+++ b/test/-ext-/test_recursion.rb
@@ -1,4 +1,5 @@
# -*- coding: us-ascii -*-
+# frozen_string_literal: false
require 'test/unit'
class TestRecursion < Test::Unit::TestCase
diff --git a/test/-ext-/time/test_new.rb b/test/-ext-/time/test_new.rb
index 5ccf6f0a5d9..699201fda59 100644
--- a/test/-ext-/time/test_new.rb
+++ b/test/-ext-/time/test_new.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require "-test-/time"
diff --git a/test/-ext-/tracepoint/test_tracepoint.rb b/test/-ext-/tracepoint/test_tracepoint.rb
index b5a6e769d6a..33d0c3e8e15 100644
--- a/test/-ext-/tracepoint/test_tracepoint.rb
+++ b/test/-ext-/tracepoint/test_tracepoint.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require '-test-/tracepoint'
diff --git a/test/-ext-/typeddata/test_typeddata.rb b/test/-ext-/typeddata/test_typeddata.rb
index 31fe32b20a4..058b7b70c5e 100644
--- a/test/-ext-/typeddata/test_typeddata.rb
+++ b/test/-ext-/typeddata/test_typeddata.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require "-test-/typeddata/typeddata"
diff --git a/test/-ext-/wait_for_single_fd/test_wait_for_single_fd.rb b/test/-ext-/wait_for_single_fd/test_wait_for_single_fd.rb
index e88dbefac69..d9fc52ebb22 100644
--- a/test/-ext-/wait_for_single_fd/test_wait_for_single_fd.rb
+++ b/test/-ext-/wait_for_single_fd/test_wait_for_single_fd.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
class TestWaitForSingleFD < Test::Unit::TestCase
diff --git a/test/-ext-/win32/test_console_attr.rb b/test/-ext-/win32/test_console_attr.rb
index 3afb2d93789..e596e13469c 100644
--- a/test/-ext-/win32/test_console_attr.rb
+++ b/test/-ext-/win32/test_console_attr.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
if /mswin|mingw/ =~ RUBY_PLATFORM and STDOUT.tty?
require '-test-/win32/console'
require 'io/console'
diff --git a/test/-ext-/win32/test_dln.rb b/test/-ext-/win32/test_dln.rb
index fe289d150f9..fd5e453719e 100644
--- a/test/-ext-/win32/test_dln.rb
+++ b/test/-ext-/win32/test_dln.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require 'tmpdir'
require 'rbconfig'
diff --git a/test/-ext-/win32/test_fd_setsize.rb b/test/-ext-/win32/test_fd_setsize.rb
index 6fe889c941d..4c64376f156 100644
--- a/test/-ext-/win32/test_fd_setsize.rb
+++ b/test/-ext-/win32/test_fd_setsize.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
module Bug