user_spec.rb

user_spec.rb

require 'spec_helper'

describe User do
  let(:user) { Factory(:user) }

  context "validation" do
    it { should have_one :purchaser }
    it { should have_one :recipient }
  end

  context "purchaser" do
    it "returns puchaser" do
      purchaser = Factory(:purchaser, :user => user)
      user.reload
      user.purchaser.should eq purchaser
    end
  end

  context "recipient" do
    it "returns recipient" do
      recipient = Factory(:recipient, :user => user)
      user.reload
      user.recipient.should eq recipient
    end
  end
end

Note: Don't test ActiveRecord build-in stuff