1 files changed, 8 insertions, 6 deletions
diff --git a/actionmailer/test/test_case_test.rb b/actionmailer/test/test_case_test.rb
index 5d8d3c3b36..7b9647d295 100644
--- a/actionmailer/test/test_case_test.rb
+++ b/actionmailer/test/test_case_test.rb
@@ -1,4 +1,6 @@
-require 'abstract_unit'
+# frozen_string_literal: true
+
+require "abstract_unit"
 
 class TestTestMailer < ActionMailer::Base
 end
@@ -8,7 +10,7 @@ class ClearTestDeliveriesMixinTest < ActiveSupport::TestCase
 
   def before_setup
     ActionMailer::Base.delivery_method, @original_delivery_method = :test, ActionMailer::Base.delivery_method
-    ActionMailer::Base.deliveries << 'better clear me, setup'
+    ActionMailer::Base.deliveries << "better clear me, setup"
     super
   end
 
@@ -20,13 +22,13 @@ class ClearTestDeliveriesMixinTest < ActiveSupport::TestCase
 
   def test_deliveries_are_cleared_on_setup_and_teardown
     assert_equal [], ActionMailer::Base.deliveries
-    ActionMailer::Base.deliveries << 'better clear me, teardown'
+    ActionMailer::Base.deliveries << "better clear me, teardown"
   end
 end
 
 class MailerDeliveriesClearingTest < ActionMailer::TestCase
   def before_setup
-    ActionMailer::Base.deliveries << 'better clear me, setup'
+    ActionMailer::Base.deliveries << "better clear me, setup"
     super
   end
 
@@ -37,7 +39,7 @@ class MailerDeliveriesClearingTest < ActionMailer::TestCase
 
   def test_deliveries_are_cleared_on_setup_and_teardown
     assert_equal [], ActionMailer::Base.deliveries
-    ActionMailer::Base.deliveries << 'better clear me, teardown'
+    ActionMailer::Base.deliveries << "better clear me, teardown"
   end
 end
 
@@ -58,7 +60,7 @@ class CrazySymbolNameMailerTest < ActionMailer::TestCase
 end
 
 class CrazyStringNameMailerTest < ActionMailer::TestCase
-  tests 'test_test_mailer'
+  tests "test_test_mailer"
 
   def test_set_mailer_class_manual_using_string
     assert_equal TestTestMailer, self.class.mailer_class