Why is this spec failing, when the conditions it's testing pass in development?
def is_destroyable?
  if user.encrypted_password.present? || user.authentications.count > 1
    true
  else
    errors.add :base, 'not allowed'
    false
  end
end

describe "Authentication#is_destroyable?" do

  before(:each) do
    # This creates a user with no password and a single authentication
    @user = FactoryGirl.create(:user_with_oauth)
    @auth = @user.authentications.first
  end

  # This spec passes :)
  it "should return false when is users only authentication method" do
    @auth.is_destroyable?.should be_false
  end

  # This FAILS - I have no idea why :(
  it "should return true when user has multiple authentications" do
    @user.authentications.create FactoryGirl.attributes_for(:authentication, :provider => 'twitter')
    @auth.is_destroyable?.should be_true
  end

  # This FAILS - I have no idea why :(
  it "should return true when user has a password" do
    @user.update_attributes :password => 'password'
    @auth.is_destroyable?.should be_true
  end

end

Failure/Error: @auth.is_destroyable?.should be_true
  expected false to be true

FactoryGirl.define do

  factory :user do
    username  { FactoryGirl.generate(:username) }
    name      'Test User'
    email     { FactoryGirl.generate(:email) }
    password  'password'
  end

  factory :user_with_oauth, :parent => :user do
    password        nil
    authentications [ FactoryGirl.build(:authentication) ]
  end

  factory :authentication do
    provider  'facebook'
    uid       SecureRandom.hex(16)
  end

end

factory :user_with_oauth, :parent => :user do
  password        nil
  authentications { [FactoryGirl.build(:authentication)] }
end