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pry(main)> a = [1,2,3]
=> [1, 2, 3]
pry(main)> a[2..3]
=> [3]
pry(main)> a[3..4] # out of bounds?
=> []
pry(main)> a[3]
=> nil
pry(main)> a[4]
=> nil

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foo = case
  when true
    'foo'
  else
    'bar'
end
# foo = 'foo'

foo = case
  when true

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require 'spec_helper'

describe 'wtf' do

  it "doesn't allow calls to a mocked method with different args" do
    mock(User).find
    User.find(1)
    User.find(23) # where uses find internally
  end
  # error unexpected find(23) called

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require 'spec_helper'

describe 'wtf' do

  it "doesn't allow non-mocked method calls if any methods are mocked" do
    u = User.new
    mock(u).first_name
    u.first_name
    u.last_name
  end

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class_eval traced_method, __FILE__, __LINE__

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## spec

it '#index' do
  mock(controller).index
  get :index
  response.should be_success
end

## controller

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Loading development environment (Rails 3.0.7)
ruby-1.9.2-p180 :001 > 
ruby-1.9.2-p180 :002 >   
ruby-1.9.2-p180 :003 >   
ruby-1.9.2-p180 :004 >   Snippet::Cheap < Snippet
 => true 
ruby-1.9.2-p180 :005 > ObjectSpace.each_object(Class).select { |v| v < Snippet }
 => [Snippet::Cheap(id: integer, location_id: integer, listing_id: integer, type: string, content: text, approved: boolean)] 
ruby-1.9.2-p180 :006 > 

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Loading development environment (Rails 3.0.7)
ruby-1.9.2-p180 :001 > 
ruby-1.9.2-p180 :002 >   
ruby-1.9.2-p180 :003 >   
ruby-1.9.2-p180 :004 >   
ruby-1.9.2-p180 :005 >   ObjectSpace.each_object(Class).select { |v| v < Snippet }
 => [] 
ruby-1.9.2-p180 :006 > Snippet::Cheap.new                                  => #<Snippet::Cheap id: nil, location_id: nil, listing_id: nil, type: "Snippet::Cheap", content: nil, approved: false> 
ruby-1.9.2-p180 :007 > ruby-1.9.2-p180 :008 >   ObjectSpace.each_object(Class).select { |v| v < Snippet }
 => [Snippet::Cheap(id: integer, location_id: integer, listing_id: integer, type: string, content: text, approved: boolean)] 

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## Controller

class FooController < ActionController::Base

  def wtf
    SomeObject.foo
  end

end

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def test_class(o)
  case o.class
    when Foo
      puts "foo class"
    else
      puts "not found"
  end
end

o = Foo.new