def test_left_right_refs(self):
# the heap will look like a linked list i.e. 10 - 11 - 10 - 12 at the end of the test
# this is testing the references between the nodes
H = FibHeap()
n1 = FibNode(10)
n2 = FibNode(11)
n3 = FibNode(10)
n4 = FibNode(12)
H.insert_node(n1)
H.insert_node(n2)
H.insert_node(n3)
H.insert_node(n4)
self.assertEqual(n4, n1.get_left())
self.assertEqual(n1, n4.get_right())
self.assertEqual(n2, n1.get_right())
self.assertEqual(n1, n2.get_left())
self.assertEqual(n3, n2.get_right())
self.assertEqual(n2, n3.get_left())
self.assertEqual(n4, n3.get_right())
self.assertEqual(n3, n4.get_left())
def test_speed_compare(self):
H = FibHeap()
random.seed()
n = 10000
gc.disable()
t1 = time.time()
for d in range(n):
H.insert_node(FibNode(random.randint(1, 100000)))
for d in range(n):
H.extract_node()
t2 = time.time()
zenFinal = t2-t1
gc.collect()
h = []
t1 = time.time()
for d in range(n):
heappush(h, random.randint(1, 100000))
for d in range(n):
heappop(h)
t2 = time.time()
pythonFinal = t2-t1
gc.enable()
self.assertGreater(pythonFinal, zenFinal)
def test_rigorous_insert_extract(self):
H = FibHeap()
random.seed()
for d in range(10000):
n = FibNode(random.randint(1, 100000))
H.insert_node(n)
H.extract_node()
def test_insert_data(self):
nodes = []
minNode = None
H = FibHeap()
random.seed()
for d in range(10000):
n = FibNode(random.randint(1, 100000))
if minNode == None or n.get_key() < minNode.get_key():
minNode = n
nodes.append(n)
H.insert_node(n)
self.assertEqual(H.get_min(), minNode)
def test_object_data(self):
H = FibHeap()
n1 = FibNode(1, 'this is a string')
self.assertEqual('this is a string', n1.get_data())
n2 = FibNode(2)
n2.set_data((1, 2))
self.assertEqual((1, 2), n2.get_data())
H.insert_node(n1)
H.insert_node(n2)
self.assertEqual('this is a string', H.extract_min_node_data())
def test_decrease_key(self):
nodes = []
maxNode = None
H = FibHeap()
random.seed()
for d in range(10000):
n = FibNode(random.randint(1, 100000))
if maxNode == None or n.get_key() > maxNode.get_key():
maxNode = n
nodes.append(n)
H.insert_node(n)
H.decrease_key(maxNode, H.get_min().get_key())
self.assertEqual(maxNode.get_key(), H.get_min().get_key())
def test_insert_extract_order(self):
nodes = []
extractedNodes = []
H = FibHeap()
random.seed()
for d in range(10000):
n = FibNode(random.randint(1, 100000))
nodes.append(n.get_key())
H.insert_node(n)
for i in range(H.get_node_count()):
n = H.extract_node()
extractedNodes.append(n.get_key())
nodes.sort()
self.assertEqual(extractedNodes, nodes)
def test_child_ref(self):
H = FibHeap()
n1 = FibNode(1)
n2 = FibNode(2)
n3 = FibNode(3)
H.insert_node(n1)
H.insert_node(n2)
H.insert_node(n3)
self.assertIsNone(n1.get_child())
self.assertIsNone(n2.get_child())
self.assertIsNone(n3.get_child())
H.extract_node()
self.assertEqual(n3, n2.get_child())
self.assertIsNone(n3.get_child())
