def test_node_delete_root_one_branch():
n = PlainNode(0)
n.insert(5)
n.delete(0)
assert n.value == 5
assert n.depth == 1
assert not n.left and not n.right
def test_node_delete_root_two_branches():
n = PlainNode(0)
n.insert(5)
n.insert(-5)
n.delete(0)
assert n.value in (5, -5)
assert bool(n.left) ^ bool(n.right)
def test_node_reports_balanced(nodes_to_insert, expected):
values = iter(nodes_to_insert)
n = PlainNode(next(values))
for value in values:
n.insert(value)
assert n.balanced == expected
def test_get_node_path_works(nodes_to_insert, key, expected):
values = iter(nodes_to_insert)
n = PlainNode(next(values))
for value in values:
n.insert(value)
result = [node.value for node in n.get_node_path(key)]
assert result == list(expected)
def test_node_delete_branch_left():
n = PlainNode(0)
n.insert(5)
n.insert(3)
n.delete(5)
assert n.value is 0
assert n.right.value == 3
assert n.right.depth == 1
assert not n.right.left and not n.right.right
def test_node_insert_can_create_new():
n = PlainNode(0, "zero")
n.insert(5, "five")
n.insert(10, "ten")
assert n.get(5).value == "five"
assert len(n) == 3
n.insert(5, "fake", replace=False)
assert n.get(5).value == "five" # Retrieves first inserted value
assert len(n) == 4
assert n.get(5).right.left.value == "fake"
def test_traverse_to_side(nodes_to_insert, node_to_start, side, expected_last_node):
values = iter(nodes_to_insert)
n = PlainNode(next(values))
for value in values:
n.insert(value)
path = n._traverse_to_side(n.get_node_path(node_to_start), side)
if not path:
assert expected_last_node is None
return
assert path[-1].value == expected_last_node
def test_node_delete_branch_2_leaves():
n = PlainNode(0)
n.insert(5)
n.insert(10)
n.insert (3)
n.delete(5)
assert n.value is 0
assert n.right.value in (10, 3)
assert n.right.depth == 2
assert n.right.left and n.right.left.value == 3 or n.right.right and n.right.right.value == 10
assert bool(n.right.left) ^ bool(n.right.right)
def test_node_insert_replaces_value():
n = PlainNode(0, "zero")
n.insert(5, "five")
n.insert(10, "ten")
assert n.get(5) is n.right
assert n.get(5).value == "five"
assert len(n) == 3
n.insert(5, "fake")
assert n.get(5) is n.right
assert n.get(5).value == "fake"
assert len(n) == 3
def test_node_get_non_existing_element_returns_path_to_closest(
nodes_to_insert,
search_value,
expected_return_values
):
values = iter(nodes_to_insert)
n = PlainNode(next(values))
for value in values:
n.insert(value)
closest_nodes = n.get_closest(search_value)
assert closest_nodes[0].value == expected_return_values[0]
assert closest_nodes[1].value == expected_return_values[1]
def test_node_delete_non_existing_value():
n = PlainNode(0)
n.insert(5)
n.insert(10)
n.insert (3)
n.insert(-5)
with pytest.raises(KeyError):
n.delete(7)
def test_node_get_non_existing_element_raises_keyerror():
n = PlainNode(0)
n.insert(5)
n.insert(10)
n.insert(7)
with pytest.raises(KeyError) as error:
n.get(8)
assert True
def test_node_insert_both_sides():
n = PlainNode(0)
n.insert(10)
n.insert(-10)
n.insert(5)
assert n.right.value == 10
assert n.left.value == -10
assert n.right.left.value == 5
def test_node_len():
n = PlainNode(0)
assert len(n) == 1
n.insert(10)
assert len(n) == 2
n.insert(5)
assert len(n) == 3
n.insert(-10)
assert len(n) == 4
def test_node_iter():
n = PlainNode(0)
n.insert(5)
n.insert(-5)
n.insert(-3)
assert [x.value for x in n] == [-5, -3, 0, 5]
def test_node_get_branch_value():
n = PlainNode(0, "zero")
n.insert(5, "five")
n.insert(10, "ten")
assert n.get(5).value == "five"
def test_depth(values, expected):
root = PlainNode(values[0])
for v in values[1:]:
root.insert(v)
assert root.depth == expected
def test_node_insert_right_left():
n = PlainNode(0)
n.insert(10)
n.insert(5)
assert n.right.left.value == 5
def test_node_insert_left():
n = PlainNode(0)
n.insert(-10)
assert n.left.value == -10
assert not n.right
assert not n.leaf
def test_node_get_identity_or_value_independs_other_nodes():
n = PlainNode(0, "zero")
n.insert(5)
n.insert(10, "ten")
assert n.get(5).value == 5
def test_node_get_leave_identity():
n = PlainNode(0)
n.insert(5)
assert n.get(5) is n.right
def test_node_get_branch_identity():
n = PlainNode(0)
n.insert(5)
n.insert(10)
assert n.get(5) is n.right
def test_node_delete_leaf():
n = PlainNode(0)
n.insert(5)
n.delete(5)
assert not n.right
assert not n.left
def test_node_insert_right():
n = PlainNode(0)
n.insert(10)
assert n.right.value == 10
assert not n.left
assert not n.leaf
def test_node_insert_right_right():
n = PlainNode(0)
n.insert(10)
n.insert(20)
assert n.right.right.value == 20
def test_node_get_leave_value():
n = PlainNode(0, "zero")
n.insert(5, "five")
assert n.get(5).value == "five"