def test_remove(self):
""" Test the removal of a key from the middle of the heap.
Given the following heap:
(4)
/ \
(4) (8)
/ \ / \
(9) (4) (12) (9)
/ \
(11) (13)
"""
data = [4, 4, 8, 9, 4, 12, 9, 11, 13]
h = Heap(data)
h.remove(2)
self.assertTrue(Heap.is_heap(data), 'should preserve heap property')
self.assertNotIn(8, h.data, 'the value corresponding to the index was removed')
def remove(self, vertex):
""" Overrides parent method to remove a vertex by it's vertex not cost.
Args
vertex: str, name of the vertex to remove.
"""
index = map(itemgetter(0), self.data).index(vertex)
return Heap.remove(self, index)
def test_remove(self):
""" Test the removal of a key from the middle of the heap.
Given the following heap:
(4)
/ \
(4) (8)
/ \ / \
(9) (4) (12) (9)
/ \
(11) (13)
"""
data = [4, 4, 8, 9, 4, 12, 9, 11, 13]
h = Heap(data)
h.remove(2)
self.assertTrue(Heap.is_heap(data), 'should preserve heap property')
self.assertNotIn(8, h.data,
'the value corresponding to the index was removed')
def test_remove_if_one_element(self):
data = [3]
h = Heap(data)
h.remove(0)
self.assertEqual(h.data, [], 'should remove the only elem in heap')
self.assertTrue(Heap.is_heap(h.data), 'should maintain heap invariant')
def test_remove_if_index_is_last(self):
data = [3, 4, 5]
h = Heap(data)
h.remove(2)
self.assertEqual(h.data, [3, 4], 'should remove the last leaf')
self.assertTrue(Heap.is_heap(h.data), 'should maintain heap invariant')
def test_remove_if_index_is_root(self):
data = [3, 4, 5]
h = Heap(data)
h.remove(0)
self.assertEqual(h.data, [4, 5], 'should remove the root')
self.assertTrue(Heap.is_heap(h.data), 'should maintain heap invariant')
def test_remove_if_one_element(self):
data = [3]
h = Heap(data)
h.remove(0)
self.assertEqual(h.data, [], 'should remove the only elem in heap')
self.assertTrue(Heap.is_heap(h.data), 'should maintain heap invariant')
def test_remove_if_index_is_last(self):
data = [3, 4, 5]
h = Heap(data)
h.remove(2)
self.assertEqual(h.data, [3, 4], 'should remove the last leaf')
self.assertTrue(Heap.is_heap(h.data), 'should maintain heap invariant')
def test_remove_if_index_is_root(self):
data = [3, 4, 5]
h = Heap(data)
h.remove(0)
self.assertEqual(h.data, [4,5], 'should remove the root')
self.assertTrue(Heap.is_heap(h.data), 'should maintain heap invariant')
