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-rw-r--r--actionpack/test/dispatch/prefix_generation_test.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/actionpack/test/dispatch/prefix_generation_test.rb b/actionpack/test/dispatch/prefix_generation_test.rb
index 18f28deee4..b28a058250 100644
--- a/actionpack/test/dispatch/prefix_generation_test.rb
+++ b/actionpack/test/dispatch/prefix_generation_test.rb
@@ -69,6 +69,7 @@ module TestGenerationPrefix
# force draw
RailsApplication.routes
+ RailsApplication.routes.define_mounted_helper(:main_app)
class ::InsideEngineGeneratingController < ActionController::Base
include BlogEngine.routes.url_helpers