public function testJoin($contact)
{
$user = new User();
$user->select('*, c.email, c.address')->join('contact as c', 'c.user_id = user.id')->find();
// email and address will stored in user data array.
$this->assertEquals($user->id, $contact->user_id);
$this->assertEquals($user->email, $contact->email);
$this->assertEquals($user->address, $contact->address);
}