module Rails::BacktraceFilterForTestUnit

def self.included(klass)

:nodoc:
For installing the BacktraceCleaner in the test/unit 
def self.included(klass)
  klass.send :alias_method_chain, :filter_backtrace, :cleaning
end

def filter_backtrace_with_cleaning(backtrace, prefix=nil) 

def filter_backtrace_with_cleaning(backtrace, prefix=nil)
  backtrace = filter_backtrace_without_cleaning(backtrace, prefix)
  backtrace = backtrace.first.split("\n") if backtrace.size == 1
  Rails.backtrace_cleaner.clean(backtrace)
end