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()); }