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-rw-r--r--activesupport/test/notifications/instrumenter_test.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/activesupport/test/notifications/instrumenter_test.rb b/activesupport/test/notifications/instrumenter_test.rb
index 122afa1cae..1d76c91d30 100644
--- a/activesupport/test/notifications/instrumenter_test.rb
+++ b/activesupport/test/notifications/instrumenter_test.rb
@@ -1,4 +1,5 @@
# frozen_string_literal: true
+
require "abstract_unit"
require "active_support/notifications/instrumenter"