public function testIsHashTable()
 {
     $boolItem = new Item(true);
     $this->assertFalse($boolItem->isHashTable());
     $intItem = new Item(123);
     $this->assertFalse($intItem->isHashTable());
     $floatItem = new Item(1.2);
     $this->assertFalse($floatItem->isHashTable());
     $stringItem = new Item('a string');
     $this->assertFalse($stringItem->isHashTable());
     $listItem = new Item(array('this', 'is', 'a', 'list'));
     $this->assertFalse($listItem->isHashTable());
     $hashTableItem = new Item(array('this' => 'is', 'a' => 'HashTable'));
     $this->assertTrue($hashTableItem->isHashTable());
 }