12-dec-code-discovery.txt

Problem: how do we figure out what we can do with the mock?
  pry into the spec
    example 'invocation matchers' do
      book = double 'book'
      expect(book).to receive(:publish).twice
      book.publish
      book.publish
      require 'pry'
      binding.pry
    end

  Use knowledge of Object Model to get objects we want to explore
    m = receive(:publish)
    ls -v m

  Look through methods to find interesting things we can do
  One was called `and_raise`,
    so we can say `... receive(:publish).and_raise ???`

  Went exploring, looking for that method
    `show-source m.and_raise`
    `show-source RSpec::Mocks::Expectations...`
    weren't getting anywhere, so lets find the code

  We know this comes from rspec-mocks
    based on the name, we infer `require "rspec/mocks"`

  Where is this lib? `gem which rspec/mocks`
  Go to that lib `2dir` (or copy/paste the dir and cd there)
  ag 'def and_raise' # or ack, grep -r
  opened the file with the definition
  here, we saw docs with examples of the invocations

---

Bigger process:
  guess a few times at anything reasonable
  if guesses don't work out, go exploring
  Once we found the method, guess again about how to use it

The process of guessing is reaching
Which gets you better at guessing
and caches knowledge
and decreases difficulty in learning new code