[Rails] #create tests fail when I add FriendlyId to my model

I am doing controller testing, and I can't seem to get the create
method test to pass when friendly_id is added to the mix. If I comment
it out of the model, the tests all pass perfectly. The moment I add it
back in, the error looks like this:

1) Error:
test_create_valid(BrandsControllerTest):
FriendlyId::BlankError: FriendlyId::BlankError
app/controllers/brands_controller.rb:16:in `create'
test/functional/brands_controller_test.rb:27:in `test_create_valid'

Here's the relevant line in brand.rb:

has_friendly_id :name, :use_slug => true, :approximate_ascii => true

Here's the test (using mocha):

def test_create_valid
Brand.any_instance.stubs(:valid?).returns(true)
post :create
assert_redirected_to brand_url(assigns(:brand))
end

Here's the fixture:

one:
name: MyString
image_file_name: MyString
image_content_type: MyString
image_file_size: 1
image_updated_at: 2011-08-03 10:49:03
tease: MyText
description: MyText

All other tests pass, and if I comment out has_friendly_id, the create
tests pass as well. Does this ring any bells for anyone?

Thanks in advance,

Walter

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