client_spec.rb

require 'minitest/spec'
require "minitest/autorun"
 
require_relative "./../../lib/mtgox/client"
 
describe "Client" do
  it "Offers" do
    c = MtGox::Client.new
    c.offers.size.must_equal 2
  end
end

command.txt

~/Dev/Ruby/BB:$ ruby test/models/client_spec.rb                                                                                                                                  

test/models/client_spec.rb:4:in `require': cannot load such file -- /Users/mark/Dev/Ruby/BB/test/lib/mtgox (LoadError)
  from test/models/client_spec.rb:4:in `<main>'

folder_tree.txt

|-- Guardfile
|-- bin
|-- lib
|   |-- bb.rb
|   |-- btce
|   `-- mtgox
|       |-- ask.rb
|       |-- bid.rb
|       |-- client.rb **
|       |-- connection.rb
|       |-- offer.rb
|       `-- request.rb
|-- test
|   |-- fixtures
|   `-- models
|       `-- client_spec.rb **