class Probatio::Context

def extract_file_and_line(backtrace)
  #l = backtrace.find { |l|
  #  ! l.index('lib/probatio/assertions.rb') &&
  #  ! l.index('_helper.rb') }
  l = backtrace.find { |l| l.index('_test.rb') }
  m = l && l.match(/([^:]+):(\d+)/)
  m && [ m[1], m[2].to_i ]
end