public function testCountItems()
{
$lockbox = new LockBox();
$lockbox->set('item1', 'value1');
$lockbox->set('item2', 'value2');
$lockbox->set('item3', 'value3');
$lockbox->set('item4', 'value4');
$this->assertEquals(4, $lockbox->count());
$lockbox->remove('item4');
$this->assertEquals(3, $lockbox->count());
}
