Rails - Sep 2005 - Testing :dependent deletes

I have a model:

class Property < ActiveRecord::Base
	# assumption exists only if property does
	has_one :assumption, :dependent => true

class Assumption < ActiveRecord::Base
	belongs_to :property


My property test case for destroy is:

assert @property.destroy()
assert_raise(ActiveRecord::RecordNotFound){
	Property.find(1)	# passes
}
assert_raise(ActiveRecord::RecordNotFound){
	Assumption.find_by_property(1)	# fails
}


I can see from the SQL that the ''assumption'' is being deleted,
and the
objects are being set to nil, but ActiveRecord is not raising an exception.
Is there a flaw in my test logic?

Thanks.