# File lib/minitest/unit.rb, line 26
  def self.filter_backtrace bt
    return ["No backtrace"] unless bt

    new_bt = []
    bt.each do |line|
      break if line.rindex(MINI_DIR, 0)
      new_bt << line
    end

    new_bt = bt.reject { |line| line.rindex(MINI_DIR, 0) } if new_bt.empty?
    new_bt = bt.dup if new_bt.empty?
    new_bt
  end