6 files changed, 12 insertions, 0 deletions
diff --git a/test/test_helper.rb b/test/test_helper.rb
index 79fde51549..7250cffea3 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Configure Rails Environment
 ENV["RAILS_ENV"] = "test"
 
diff --git a/test/unit/attachment_test.rb b/test/unit/attachment_test.rb
index 56a4ea1dd8..728742c366 100644
--- a/test/unit/attachment_test.rb
+++ b/test/unit/attachment_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 class ActionText::AttachmentTest < ActiveSupport::TestCase
diff --git a/test/unit/content_test.rb b/test/unit/content_test.rb
index dada9cc714..17bc6c0013 100644
--- a/test/unit/content_test.rb
+++ b/test/unit/content_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 class ActionText::ContentTest < ActiveSupport::TestCase
diff --git a/test/unit/model_test.rb b/test/unit/model_test.rb
index 50632c19a7..99a249946a 100644
--- a/test/unit/model_test.rb
+++ b/test/unit/model_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 class ActionText::ModelTest < ActiveSupport::TestCase
diff --git a/test/unit/plain_text_conversion_test.rb b/test/unit/plain_text_conversion_test.rb
index 47c95b6bc3..fd67f8eca8 100644
--- a/test/unit/plain_text_conversion_test.rb
+++ b/test/unit/plain_text_conversion_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 class ActionText::PlainTextConversionTest < ActiveSupport::TestCase
diff --git a/test/unit/trix_attachment_test.rb b/test/unit/trix_attachment_test.rb
index fe834c8663..9cb338b8c2 100644
--- a/test/unit/trix_attachment_test.rb
+++ b/test/unit/trix_attachment_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 class ActionText::TrixAttachmentTest < ActiveSupport::TestCase