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-rw-r--r--actionmailer/lib/action_mailer/test_case.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/actionmailer/lib/action_mailer/test_case.rb b/actionmailer/lib/action_mailer/test_case.rb
index e60dda9694..80f323873d 100644
--- a/actionmailer/lib/action_mailer/test_case.rb
+++ b/actionmailer/lib/action_mailer/test_case.rb
@@ -20,6 +20,7 @@ module ActionMailer
module Behavior
extend ActiveSupport::Concern
+ include ActiveSupport::Testing::ConstantLookup
include TestHelper
included do