expect.rb

# doesn't work for everything - just a proof of concept

module Expect
  def expect(actual, matcher)
    unless matcher.matches?(actual)
      raise Spec::Expectations::ExpectationNotMetError.new(matcher.failure_message_for_should)
    end
  end
end

Rspec.configure do |config|
  config.include(Expect)
end

module Rspec::Matchers
  alias_method :eq, :equal
end

describe 5 do
  it "equals 5" do
    expect 5, eq(5)
  end
end