I'm trying to implement shoulda unit tests on a rails 2.3.5 app using mongomapper.

So far I've:

1. Configured a rails app that uses mongomapper (the app works)
2. Added shoulda to my gems, and installed it with rake gems:install
3. Added config.frameworks -= [ :active_record, :active_resource ] to config/environment.rb so ActiveRecord isn't used.

My models look like this:

class Account
  include MongoMapper::Document

  key :name, String, :required => true
  key :description, String
  key :company_id, ObjectId
  key :_type, String

  belongs_to :company
  many :operations

end

My test for that model is this one:

class AccountTest < Test::Unit::TestCase

  should_belong_to :company
  should_have_many :operations

  should_validate_presence_of :name

end

It fails on the first should_belong_to:

./test/unit/account_test.rb:3: undefined method `should_belong_to' for AccountTest:Class (NoMethodError)

Any ideas why this doesn't work? Should I try something different from shoulda?

I must point out that this is the first time I try to use shoulda, and I'm pretty new to testing itself.