rails attr_accessible rspec check

When I want to test if attribute is / is not accessible with RSpec I'm doing it like this

class Foo
  attr_accesible :something_else
end

describe Foo do
  it('author should not be accessible')    {lambda{described_class.new(:author=>true)}.should raise_error ActiveModel::MassAssignmentSecurity::Error}
  it('something_else should be accessible'){lambda{described_class.new(:something_else=>true)}.should_not raise_error ActiveModel::MassAssignmentSecurity::Error}
end

is there better way doing that ?

...thx