From: Brian Candler <b.candler@...>
Date: 2011-04-20T17:45:52+09:00
Subject: Re: assert_name doesn't exist as a function?

Mike RegistrationErr wrote in post #993884:
> I added this line:
> require 'test/unit/assertions'
>
> Which is different from:
> include Test::Unit::Assertions
>
> In PHP require and include are the same hence the confusion having come
> from PHP. I don't understand the difference between require and include
> in ruby yet, but at least my problem is sorted :)

"require" means "go and load this ruby source file, if you've not loaded 
it before"

"include" means (roughly) "add the methods in that module into the 
current class"

"extend" means (roughly) "add the methods in that module into the 
current object"

module Foo
  def bar
    puts "I am bar!"
  end
end

bar         # doesn't work
include Foo
bar         # now it works

a = "Hello"
a.extend Foo
a.bar       # this works too

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