5 files changed, 5 insertions, 0 deletions
diff --git a/activerecord/test/support/config.rb b/activerecord/test/support/config.rb
index aaff408b41..e385d7fff7 100644
--- a/activerecord/test/support/config.rb
+++ b/activerecord/test/support/config.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "yaml"
 require "erb"
 require "fileutils"
diff --git a/activerecord/test/support/connection.rb b/activerecord/test/support/connection.rb
index 1a609e13c3..06a037d3d0 100644
--- a/activerecord/test/support/connection.rb
+++ b/activerecord/test/support/connection.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "active_support/logger"
 require "models/college"
 require "models/course"
diff --git a/activerecord/test/support/connection_helper.rb b/activerecord/test/support/connection_helper.rb
index 4a19e5df44..5e37a4a991 100644
--- a/activerecord/test/support/connection_helper.rb
+++ b/activerecord/test/support/connection_helper.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module ConnectionHelper
   def run_without_connection
     original_connection = ActiveRecord::Base.remove_connection
diff --git a/activerecord/test/support/ddl_helper.rb b/activerecord/test/support/ddl_helper.rb
index 43cb235e01..3a07316637 100644
--- a/activerecord/test/support/ddl_helper.rb
+++ b/activerecord/test/support/ddl_helper.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module DdlHelper
   def with_example_table(connection, table_name, definition = nil)
     connection.execute("CREATE TABLE #{table_name}(#{definition})")
diff --git a/activerecord/test/support/schema_dumping_helper.rb b/activerecord/test/support/schema_dumping_helper.rb
index 666c1b6a14..1a3f67f3ed 100644
--- a/activerecord/test/support/schema_dumping_helper.rb
+++ b/activerecord/test/support/schema_dumping_helper.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module SchemaDumpingHelper
   def dump_table_schema(table, connection = ActiveRecord::Base.connection)
     old_ignore_tables = ActiveRecord::SchemaDumper.ignore_tables