public function test_add_behaviour()
{
$chain = new Chain();
assertThat($chain->find('fred'), is(null));
$chain->add('fred');
assertThat($chain->find('fred'), is('fred'));
assertThat($chain->find('wilma'), is(null));
$chain->add('wilma');
assertThat($chain->find('fred'), is('fred'));
assertThat($chain->find('wilma'), is('wilma'));
assertThat($chain->getTokens(), contains(array('fred', 'wilma')));
}
