1 files changed, 8 insertions, 0 deletions
diff --git a/railties/lib/rails/test_unit/railtie.rb b/railties/lib/rails/test_unit/railtie.rb
index 21b9dbc074..f7f07ac053 100644
--- a/railties/lib/rails/test_unit/railtie.rb
+++ b/railties/lib/rails/test_unit/railtie.rb
@@ -13,5 +13,13 @@ module Rails
     rake_tasks do
       load "rails/test_unit/testing.rake"
     end
+
+    initializer "test_unit.backtrace_cleaner" do
+      # TODO: Figure out how to get the Rails::BacktraceFilter into minitest/unit
+      unless defined?(Minitest) || ENV['BACKTRACE']
+        require 'rails/backtrace_cleaner'
+        Test::Unit::Util::BacktraceFilter.module_eval { include Rails::BacktraceFilterForTestUnit }
+      end
+    end
   end
 end
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