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-rw-r--r--test/unit/mail_ext/address_equality_test.rb2
-rw-r--r--test/unit/mail_ext/address_wrapping_test.rb2
-rw-r--r--test/unit/mail_ext/recipients_test.rb2
3 files changed, 6 insertions, 0 deletions
diff --git a/test/unit/mail_ext/address_equality_test.rb b/test/unit/mail_ext/address_equality_test.rb
index 56e9bfa47f..7ea4360b76 100644
--- a/test/unit/mail_ext/address_equality_test.rb
+++ b/test/unit/mail_ext/address_equality_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
require_relative '../../test_helper'
module MailExt
diff --git a/test/unit/mail_ext/address_wrapping_test.rb b/test/unit/mail_ext/address_wrapping_test.rb
index 6baa360f3e..a9ae820e26 100644
--- a/test/unit/mail_ext/address_wrapping_test.rb
+++ b/test/unit/mail_ext/address_wrapping_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
require_relative '../../test_helper'
module MailExt
diff --git a/test/unit/mail_ext/recipients_test.rb b/test/unit/mail_ext/recipients_test.rb
index e39e1eb89c..4730896354 100644
--- a/test/unit/mail_ext/recipients_test.rb
+++ b/test/unit/mail_ext/recipients_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
require_relative '../../test_helper'
module MailExt