class Test::Unit::AssertionFailedError

def initialize(message=nil, options=nil)
  options ||= {}
  @expected = options[:expected]
  @actual = options[:actual]
  @inspected_expected = options[:inspected_expected]
  @inspected_actual = options[:inspected_actual]
  @user_message = options[:user_message]
  super(message)
  debug_on_failure
end