class SimpleCov::Formatter::Base

def stats_line(criterion, stat)

output specifically suppressed it.
Showing "Branch coverage: 0 / 0 (100.00%)" is noise; the older
measure (e.g. a file with no branches under branch coverage).
Returns nil for branch/method criteria that have nothing to 
def stats_line(criterion, stat)
  return if criterion != :line && !stat.total.positive?
  percent = SimpleCov.round_coverage(stat.percent)
  Kernel.format(
    "%<label>s coverage: %<covered>d / %<total>d (%<percent>s)",
    label: criterion.to_s.capitalize,
    covered: stat.covered,
    total: stat.total,
    percent: SimpleCov::Color.colorize_percent(percent)
  )
end