Bringing back the oldschool RSpec style.

bring_back_oldschool_rspec.rb

module MahAssertions
  refine BasicObject do
    def is(val)
      return true if self == val
      ::Kernel.raise RSpec::Expectations::ExpectationNotMetError, "#{inspect} is not #{val.inspect}", caller
    end
  end
end

require 'rspec/autorun'
class << RSpec
  alias old_describe describe
  def describe(*args, &block)
    block.binding.eval 'using MahAssertions'
    old_describe(*args, &block)
  end
end

RSpec.describe 'something' do
  it('passes') { 1.is 1 }
  it('fails')  { 1.is 2 }
end

# >> .F
# >> 
# >> Failures:
# >> 
# >>   1) something fails
# >>      Failure/Error: it('fails')  { 1.is 2 }
# >>        1 is not 2
# >>      # program.rb:21:in `block (2 levels) in <main>'
# >> 
# >> Finished in 0.0032 seconds (files took 0.11636 seconds to load)
# >> 2 examples, 1 failure
# >> 
# >> Failed examples:
# >> 
# >> rspec program.rb:21 # something fails
# >>