6 files changed, 6 insertions, 0 deletions
diff --git a/test/-ext-/bignum/test_big2str.rb b/test/-ext-/bignum/test_big2str.rb
index 0af552ea70..4fae24eb34 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 f75c4590b8..8529e54456 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 9c1a3c3d2a..9a8e93b081 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 3e78247aa4..103a00fbad 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 f2a3df814e..04bf3e02de 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 4304be88e9..3b5750154e 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"