Question

Is there a config variable to set, or some other way to get Rails ActiveSupport::TestCase to show more than one trace line? It is really hard to debug otherwise.

Example:

ERROR test_something (0.73s) 
      SystemStackError: stack level too deep
      /Users/mario/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.0.9/lib/active_record/connection_adapters/abstract/database_statements.rb:153

Answer 1

See whether you haven’t a file config/initializers/backtrace_silencers.rb

It says:

# You can also remove all the silencers if you're trying to debug
# a problem that might stem from framework code.
Rails.backtrace_cleaner.remove_silencers!

You can also call remove_filters! if the first was not enough, but filters only make the paths shorter, while silencers do remove some lines from the backtrace.

You may find the source code in railties/lib/rails/backtrace_cleaner.rb and activesupport/lib/active_support/backtrace_cleaner.rb useful.