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-rw-r--r--actionpack/lib/action_dispatch/testing/assertions/routing.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/actionpack/lib/action_dispatch/testing/assertions/routing.rb b/actionpack/lib/action_dispatch/testing/assertions/routing.rb
index 89d1a49403..e6d6b5a3ef 100644
--- a/actionpack/lib/action_dispatch/testing/assertions/routing.rb
+++ b/actionpack/lib/action_dispatch/testing/assertions/routing.rb
@@ -1,3 +1,5 @@
+require 'active_support/core_ext/hash/diff'
+
module ActionDispatch
module Assertions
# Suite of assertions to test routes generated by Rails and the handling of requests made to them.