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-rw-r--r--activesupport/test/core_ext/object/deep_dup_test.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/activesupport/test/core_ext/object/deep_dup_test.rb b/activesupport/test/core_ext/object/deep_dup_test.rb
index 2486592441..1fb26ebac7 100644
--- a/activesupport/test/core_ext/object/deep_dup_test.rb
+++ b/activesupport/test/core_ext/object/deep_dup_test.rb
@@ -47,7 +47,7 @@ class DeepDupTest < ActiveSupport::TestCase
object = Object.new
dup = object.deep_dup
dup.instance_variable_set(:@a, 1)
- assert !object.instance_variable_defined?(:@a)
+ assert_not object.instance_variable_defined?(:@a)
assert dup.instance_variable_defined?(:@a)
end