Add first spec draft's pieces
user
```ruby
require 'spec_helper'
require 'pathname'


describe Caja::Box do
  
  context "initialization" do
    
    it "should raise an error if the data store can not be created" do
      let(:bad_path) { "~/i-dont-exist.db"}
      expect { Caja::Box.new(bad_path) }.to raise_error(Caja::IOError)
      PathName::File.exist?(bad_path).should_not be_true
    end

    it "should create a new file in case the initialization is successful" do
      let(:good_path) { "./caja.db" }
      before { fail if PathName::File.exist?(good_path) }
      after { PathName::File.delete(good_path) }

      box = Caja::Box.new(good_path)
      PathName::File.exist?(good_path).should be_true
    end
  
  end

end
```
assistant