Association callbacks are not matched.

[sujoyg]

Observation: The following succeeds.

describe Foo do
it { should have_and_belong_to :bars, :after_add => :tweet_about_bar }
end

class Foo < ActiveRecord::Base
has_and_belongs_to_many :bars
end

Expectation: It should check for the presence of the after_add callback in the association declaration.