rspec_immediate_feedback_formatter.rb

require 'spec/runner/formatter/specdoc_formatter'

#monkey-patch the specdoc formatter to immediately print failure messages (and continue)
module Spec
  module Runner
    module Formatter
      class SpecdocFormatter
        alias :example_failed_without_immediate_feedback :example_failed
        def example_failed(example, counter, failure)
          example_failed_without_immediate_feedback(example, counter, failure)
          dump_failure(counter, failure)  # dump stacktrace immediately
          output.flush
        end
      end
    end
  end
end