Initialize @app if it doesn't exists.

b8c565fb · Emilio Tagua · 197a995b · b8c565fb
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actionpack/lib/action_dispatch/testing/integration.rb actionpack/lib/action_dispatch/testing/integration.rb +1 -1

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--- a/actionpack/lib/action_dispatch/testing/integration.rb
+++ b/actionpack/lib/action_dispatch/testing/integration.rb
@@ -308,7 +308,7 @@ module Runner
      include ActionDispatch::Assertions

      def app
-        @app
+        @app ||= nil
      end

      # Reset the current session. This is useful for testing multiple sessions