def testOneElementList():
l = DoublyLinkedList()
l.insert("name", "steve")
assert(l.find("name") == "steve")
assert(l.find("organization") is None)
l.deleteFirst()
assert(l.length() == 0)
def testList():
l = DoublyLinkedList()
l.insert("name", "steve")
assert(l.length() == 1)
l.insert("name", "ken")
assert(l.find("name") == "ken")
l.insert("name", "rob")
l.insert("name", "brian")
assert(l.find("name") == "brian")
assert(l.length() == 4)
l.deleteFirst()
assert(l.length() == 3)
assert(l.find("name") == "rob")
