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-rw-r--r--actionpack/lib/action_dispatch/testing/assertions/tag.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/actionpack/lib/action_dispatch/testing/assertions/tag.rb b/actionpack/lib/action_dispatch/testing/assertions/tag.rb
index b74dcb1fe4..5c735e61b2 100644
--- a/actionpack/lib/action_dispatch/testing/assertions/tag.rb
+++ b/actionpack/lib/action_dispatch/testing/assertions/tag.rb
@@ -1,3 +1,5 @@
+require 'action_controller/vendor/html-scanner'
+
module ActionDispatch
module Assertions
# Pair of assertions to testing elements in the HTML output of the response.