module SimpleCov::CLI::Diff

def format_delta(delta, label, color)

absolute coverage level lands.
(green) and a -5% drop is bad (red), regardless of where the
Deltas are sign-based, not threshold-based: a +5% bump is good 
def format_delta(delta, label, color)
  sign = delta.positive? ? "+" : ""
  text = format("%<sign>s%<delta>6.2f%% %<label>s", sign: sign, delta: delta, label: label)
  SimpleCov::Color.colorize(text, delta.negative? ? :red : :green, enabled: color)
end