nilmdb/tests/test_rbtree.py

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# -*- coding: utf-8 -*-
import nilmdb
from nilmdb.utils.printf import *
from nose.tools import *
from nose.tools import assert_raises
from nilmdb.server.rbtree import RBTree, RBNode
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from testutil.helpers import *
import unittest
# set to False to skip live renders
do_live_renders = False
def render(tree, description = "", live = True):
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import testutil.renderdot as renderdot
r = renderdot.RBTreeRenderer(tree)
return r.render(description, live and do_live_renders)
class TestRBTree:
def test_rbtree(self):
rb = RBTree()
rb.insert(RBNode(10000, 10001))
rb.insert(RBNode(10004, 10007))
rb.insert(RBNode(10001, 10002))
# There was a typo that gave the RBTree a loop in this case.
# Verify that the dot isn't too big.
s = render(rb, live = False)
assert(len(s.splitlines()) < 30)
def test_rbtree_big(self):
import random
random.seed(1234)
# make a set of 100 intervals, inserted in order
rb = RBTree()
j = 100
for i in xrange(j):
rb.insert(RBNode(i, i+1))
render(rb, "in-order insert")
# remove about half of them
for i in random.sample(xrange(j),j):
if random.randint(0,1):
rb.delete(rb.find(i, i+1))
render(rb, "in-order insert, random delete")
# make a set of 100 intervals, inserted at random
rb = RBTree()
j = 100
for i in random.sample(xrange(j),j):
rb.insert(RBNode(i, i+1))
render(rb, "random insert")
# remove about half of them
for i in random.sample(xrange(j),j):
if random.randint(0,1):
rb.delete(rb.find(i, i+1))
render(rb, "random insert, random delete")
# in-order insert of 50 more
for i in xrange(50):
rb.insert(RBNode(i+500, i+501))
render(rb, "random insert, random delete, in-order insert")
def test_rbtree_basics(self):
rb = RBTree()
vals = [ 7, 14, 1, 2, 8, 11, 5, 15, 4]
for n in vals:
rb.insert(RBNode(n, n))
# stringify
s = ""
for node in rb:
s += str(node)
in_("[node (None) 1", s)
eq_(str(rb.nil), "[node nil]")
# inorder traversal, successor and predecessor
last = 0
for node in rb:
assert(node.start > last)
last = node.start
successor = rb.successor(node)
if successor:
assert(rb.predecessor(successor) is node)
predecessor = rb.predecessor(node)
if predecessor:
assert(rb.successor(predecessor) is node)
# Delete node not in the tree
with assert_raises(AttributeError):
rb.delete(RBNode(1,2))
# Delete all nodes!
for node in rb:
rb.delete(node)
# Build it up again, make sure it matches
for n in vals:
rb.insert(RBNode(n, n))
s2 = ""
for node in rb:
s2 += str(node)
assert(s == s2)
def test_rbtree_find(self):
# Get a little bit of coverage for some overlapping cases,
# even though the class doesn't fully support it.
rb = RBTree()
nodes = [ RBNode(1, 5), RBNode(1, 10), RBNode(1, 15) ]
for n in nodes:
rb.insert(n)
assert(rb.find(1, 5) is nodes[0])
assert(rb.find(1, 10) is nodes[1])
assert(rb.find(1, 15) is nodes[2])
def test_rbtree_find_leftright(self):
# Now let's get some ranges in there
rb = RBTree()
vals = [ 7, 14, 1, 2, 8, 11, 5, 15, 4]
for n in vals:
rb.insert(RBNode(n*10, n*10+5))
# Check find_end_left, find_right_start
for i in range(160):
left = rb.find_left_end(i)
right = rb.find_right_start(i)
if left:
# endpoint should be more than i
assert(left.end >= i)
# all earlier nodes should have a lower endpoint
for node in rb:
if node is left:
break
assert(node.end < i)
if right:
# startpoint should be less than i
assert(right.start <= i)
# all later nodes should have a higher startpoint
for node in reversed(list(rb)):
if node is right:
break
assert(node.start > i)
def test_rbtree_intersect(self):
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# Fill with some ranges
rb = RBTree()
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rb.insert(RBNode(10,20))
rb.insert(RBNode(20,25))
rb.insert(RBNode(30,40))
# Just a quick test; test_interval will do better.
eq_(len(list(rb.intersect(1,100))), 3)
eq_(len(list(rb.intersect(10,20))), 1)
eq_(len(list(rb.intersect(5,15))), 1)
eq_(len(list(rb.intersect(15,15))), 1)
eq_(len(list(rb.intersect(20,21))), 1)
eq_(len(list(rb.intersect(19,21))), 2)