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-rw-r--r--test/resolv/test_addr.rb1
-rw-r--r--test/resolv/test_dns.rb1
-rw-r--r--test/resolv/test_resource.rb1
3 files changed, 3 insertions, 0 deletions
diff --git a/test/resolv/test_addr.rb b/test/resolv/test_addr.rb
index e06c3c2a4c..4a2df5bfca 100644
--- a/test/resolv/test_addr.rb
+++ b/test/resolv/test_addr.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require 'resolv'
require 'socket'
diff --git a/test/resolv/test_dns.rb b/test/resolv/test_dns.rb
index 9f993ba96a..338130e64f 100644
--- a/test/resolv/test_dns.rb
+++ b/test/resolv/test_dns.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require 'resolv'
require 'socket'
diff --git a/test/resolv/test_resource.rb b/test/resolv/test_resource.rb
index 7ec17e33e7..8045bbc6ee 100644
--- a/test/resolv/test_resource.rb
+++ b/test/resolv/test_resource.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require 'resolv'