>>> from utils import *
>>> from moving import Point

>>> computeChi2([],[])
0.0
>>> computeChi2(range(1,10),range(1,10))
0.0
>>> computeChi2(range(1,9),range(1,10))
0.0

>>> segmentIntersection(Point(0,0),Point(1,1), Point(0,1), Point(1,2))
>>> segmentIntersection(Point(0,1),Point(1,0), Point(0,2), Point(2,1))
>>> segmentIntersection(Point(0,0),Point(2,0), Point(1,-1),Point(1,1))
(1.000000,0.000000)
>>> segmentIntersection(Point(0,1),Point(2,0),Point(1,1),Point(1,2))

>>> f = openCheck('non_existant_file.txt')
File non_existant_file.txt could not be opened.

>>> removeExtension('test-adfasdf.asdfa.txt')
'test-adfasdf.asdfa'
>>> removeExtension('test-adfasdf')
'test-adfasdf'