rspec-like specs, using ruby procs

minispec.rb

def describe(label)
  fails = []
  it = ->(it_label, &block) {
    assert = ->(expected, result) {
      passed = ->() { print '.' }
      failed = ->() {
        print 'F'
        fails << "#{label} #{it_label}, expected '#{expected}', but was '#{result}'."
      }
      expected == result ? passed.() : failed.()
    }
    block.(assert)
  }
  yield(it)
  puts
  if fails.any?
    puts "\n[FAILED]: \n"
    puts "#{fails.join("\n")}"
  end
end

minispec_example.rb

require_relative 'minispec'

describe 'minispec' do |it|
  it.('should pass') do |assert|
    assert.('describe', 'describe')
  end

  it.('should fail') do |assert|
    assert.('describes', 'describe')
  end
end