Its: allowing params feature

"its" could allow easily the use of methods with parameters like its("phone_numbers[0]").

# I think this piece of code could be changed from:

def its(attribute, &block)
  ..
      let(:__its_subject) do
        attribute_chain = attribute.to_s.split('.')
          attribute_chain.inject(subject) do |inner_subject, attr|
            inner_subject.send(attr)
          end
        end
      end
   ..

# to this, to allow params and method chaining
..
  let(:__its_subject) do
    subject.instance_eval(attribute.to_s)
  end
..

[myronmarston]

This has been requested before (see #306 and #553), but for a variety of reasons (see this gist), we're planning to remove its from rspec 3.

Also, there's already an external gem that provides this behavior:

https://github.com/dnagir/its