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-rw-r--r--activemodel/test/cases/helper.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/activemodel/test/cases/helper.rb b/activemodel/test/cases/helper.rb
index eeb5c85a48..be0817624c 100644
--- a/activemodel/test/cases/helper.rb
+++ b/activemodel/test/cases/helper.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "active_model"
# Show backtraces for deprecated behavior for quicker cleanup.