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-rw-r--r--activesupport/test/core_ext/hash_ext_test.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/activesupport/test/core_ext/hash_ext_test.rb b/activesupport/test/core_ext/hash_ext_test.rb
index e8fc94e6d6..5d422ce5ad 100644
--- a/activesupport/test/core_ext/hash_ext_test.rb
+++ b/activesupport/test/core_ext/hash_ext_test.rb
@@ -4,6 +4,7 @@ require 'bigdecimal'
require 'active_support/core_ext/string/access'
require 'active_support/ordered_hash'
require 'active_support/core_ext/object/conversions'
+require 'active_support/core_ext/object/deep_dup'
require 'active_support/inflections'
class HashExtTest < ActiveSupport::TestCase