Sample spec for https://twitter.com/tagomoris/status/615481658045673472

large_args_spec.rb

require 'spec_helper'

class Foo
  def self.bar(*args)
    raise 'Should be stubbed.'
  end
end

describe 'Large args' do
  example do
    # RSpec 3.x
    # https://relishapp.com/rspec/rspec-mocks/v/3-3/docs/setting-constraints/matching-arguments
    # expect(Foo).to receive(:bar) do |*args|
    #   array = args[0]
    #   expect(array).to eq [1, 2, 3]
    #   hash = args[1]
    #   expect(hash).to eq a: 1, b: 2, c: 3
    # end

    # RSpec 2.x
    # https://relishapp.com/rspec/rspec-mocks/v/2-9/docs/message-expectations
    Foo.should_receive(:bar) do |*args|
      array = args[0]
      expect(array).to eq [1, 2, 3]
      hash = args[1]
      expect(hash).to eq a: 1, b: 2, c: 3
    end

    Foo.bar([1, 2, 3], {a: 1, b: 2, c: 3})
  end
end