Ruby - Utils

class_eval.rb

require 'irb'

class Foobar
  def foo
    :foo
  end
end

Foobar.class_eval do
  def bar
    :bar
  end
end

class Foobar
  def foobar
    :foobar
  end
end

Foo.new.foo #=> :foo
Foo.new.bar #=> :bar
Foo.new.foobar #=> :foobar
Foo.new.methods.grep /(foo|bar)/ #=> [:foo, :bar, :foobar]

IRB.start

format_significant_integers.rb

"44444401".reverse.scan(/\d{3}|\d{1,2}/).map(&:reverse).reverse.join '.' #=> "44.444.401"

test_sidekiq_delayed_mailer.rb

shared_examples_for '#send_to_managers' do
  it 'sends a notification to every Business\' manager' do
    worker  = Sidekiq::Extensions::DelayedMailer
    options = { method: :summary_report, id: summary.create.id }
    worker.clear
    summary.send_to_managers
    is_expected.to have_enqueued_job(worker, options)
  end
end