public function testOldestItemsGetDroppedWhenUnused()
{
$pool = new LRUCache(4);
// foo1 gets dropped
$pool->set('foo1', 10);
$pool->set('foo2', 20);
$pool['foo3'] = 30;
$pool['foo4'] = 40;
$pool->set('foo5', 50);
$this->assertEquals(null, $pool->get('foo1'));
$this->assertFalse(isset($pool['foo1']));
$this->assertEquals(20, $pool->get('foo2'));
$this->assertEquals(30, $pool->get('foo3'));
$this->assertEquals(40, $pool['foo4']);
$this->assertEquals(50, $pool['foo5']);
$this->assertEquals(4, $pool->size());
// remove item using unset
unset($pool['foo4']);
$this->assertFalse(isset($pool['foo4']));
$this->assertEquals(null, $pool['foo4']);
$this->assertEquals(3, $pool->size());
// remove item using method
$this->assertEquals(20, $pool->remove('foo2'));
$this->assertEquals(2, $pool->size());
$this->assertEquals(null, $pool->remove('foo2'));
// clear the cache
$pool->clear();
$this->assertEquals(null, $pool['foo2']);
$this->assertEquals(0, $pool->size());
}
