4 files changed, 4 insertions, 0 deletions
diff --git a/test/bigdecimal/test_bigdecimal.rb b/test/bigdecimal/test_bigdecimal.rb
index edbaa163b4..f10c50b47a 100644
--- a/test/bigdecimal/test_bigdecimal.rb
+++ b/test/bigdecimal/test_bigdecimal.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 require_relative "testbase"
 require 'bigdecimal/math'
 
diff --git a/test/bigdecimal/test_bigdecimal_util.rb b/test/bigdecimal/test_bigdecimal_util.rb
index e4d64006ab..c3a45b2eee 100644
--- a/test/bigdecimal/test_bigdecimal_util.rb
+++ b/test/bigdecimal/test_bigdecimal_util.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 require_relative "testbase"
 
 require 'bigdecimal/util'
diff --git a/test/bigdecimal/test_bigmath.rb b/test/bigdecimal/test_bigmath.rb
index 740c755eae..6f271d0960 100644
--- a/test/bigdecimal/test_bigmath.rb
+++ b/test/bigdecimal/test_bigmath.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 require_relative "testbase"
 require "bigdecimal/math"
 
diff --git a/test/bigdecimal/testbase.rb b/test/bigdecimal/testbase.rb
index c014e61e92..22b05f09ae 100644
--- a/test/bigdecimal/testbase.rb
+++ b/test/bigdecimal/testbase.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 require "test/unit"
 require "bigdecimal"