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-rw-r--r--test/excludes/TestException.rb1
-rw-r--r--test/excludes/TestIO_Console.rb1
-rw-r--r--test/excludes/TestThread.rb1
3 files changed, 3 insertions, 0 deletions
diff --git a/test/excludes/TestException.rb b/test/excludes/TestException.rb
index 78ee4ca1c0..a992950152 100644
--- a/test/excludes/TestException.rb
+++ b/test/excludes/TestException.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
reason = %[\
Because machine stack overflow can happen anywhere, even critical
sections including external libraries, it is very neary impossible to
diff --git a/test/excludes/TestIO_Console.rb b/test/excludes/TestIO_Console.rb
index 26780c01b1..caf1935fec 100644
--- a/test/excludes/TestIO_Console.rb
+++ b/test/excludes/TestIO_Console.rb
@@ -1 +1,2 @@
+# frozen_string_literal: false
exclude(:test_getpass, 'not portable')
diff --git a/test/excludes/TestThread.rb b/test/excludes/TestThread.rb
index 0b4050b4eb..ea73a4c010 100644
--- a/test/excludes/TestThread.rb
+++ b/test/excludes/TestThread.rb
@@ -1 +1,2 @@
+# frozen_string_literal: false
exclude(/_stack_size$/, 'often too expensive')