public void QuadraticHashTableOverloadingContainsTest()
        {
            IHashTable hashTable = new QuadraticHashTable(2);

            Assert.IsTrue(hashTable.Add(3));
            Assert.IsTrue(hashTable.Add(3));
            Assert.IsFalse(hashTable.Add(6),
                           "quadritic hash table should not be able to add element");

            Assert.IsFalse(hashTable.Contains(6),
                           "quadritic hash table should not contains not added element");
        }