class ParallelSpecs::SpecSummaryLogger

def dump_failure(*args)

RSpec 1: dumps 1 failed spec 
def dump_failure(*args)
  lock_output do
    super
  end
  @output.flush
end

def dump_failures(*args)

RSpec 2: dumps all failed specs 
def dump_failures(*args)
  lock_output do
    super
  end
  @output.flush
end