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class Sentence
  def test(sen)
    first = sen[0]
    last = sen.split('').last
    rest = sen[1..-1]
    word_arr = sen.split
    word_arr_len = word_arr.length

    unless first == first.upcase then
      puts "the first letter is not in uppercase"

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max_stack_frames = 500

TooManyStackFrames = Class.new(StandardError)

TracePoint.new(:call) do |tp|
  if caller.size >= max_stack_frames
    raise TooManyStackFrames, "Stack has exceeded #{max_stack_frames} frames"
  end
end.enable

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RSpec::Matchers.define :an_exception_caused_by do |cause|
  match do |exception|
    cause === exception.cause
  end
end

expect {
  begin
    "foo".gsub # requires 2 args
  rescue ArgumentError

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expect {
  expect(the_dbl).to have_received(:expected_method).with(:one).once
}.to raise_error(Expectations::ExpectationNotMetError,
                 a_string_including("expected: 1 time",
                                    "received: 2 times"))

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# A sample Gemfile
source "https://rubygems.org"

gem 'rspec'

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coverage

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require_relative '../order.rb'

describe Order do
  def new_order(input)
    order = Order.new
    allow(order).to receive(:input).and_return(input)
    order
  end

  it 'gets dish number as input' do

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class SomeEntity
  def run
    transaction do
      mark_non_eligible
      make_invoice_batch
      send_batch_email
    end
  end

  def transaction

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Haven't dived into RSpec but is it not possible for expect to accept either args or blocks, and process them internally?

First off, expect does accept either an arg or a block already. But if it's a block (or a proc/lambda arg), expect does not call the block automatically -- it just passes the block to the matcher and allows the matcher to call it if it wants. This is necessary because some matchers (the block matchers like raise_error, change, etc) must wrap the block in some extra logic to work properly because they deal in side effects, not expression return values.

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source "https://rubygems.org"

gem 'rspec-core', "~> 3.1.7"
gem 'allocation_stats'