def testSameLengths(self):
"""
If both files have the same number of lines but nothing in common,
(n, n, 0) must be returned, where n is the number of lines.
"""
self.assertEqual((2, 2, 0),
countCommon(lines('ABC DEF'), lines('1234 5678')))
def testSecondShorterNothingInCommon(self):
"""
If the second file is shorter than the first and nothing is in common,
(n, m, 0) must be returned where n is the number of lines in the first
file and m is the number in the second file.
"""
self.assertEqual((4, 2, 0), countCommon(lines('A B C D'),
lines('1 2')))
def testSecondShorterSomethingInCommon(self):
"""
If the second file is shorter than the first and there is something in
common, (n, m, c) must be returned where n is the number of lines in
the first file, m is the number in the second file, and c is the
number in common.
"""
self.assertEqual((4, 7, 2),
countCommon(lines('A B C D'), lines('1 2 A B 3 4 5')))
def testSecondEmpty(self):
"""
If the second file is empty, (n, 0, 0) must be returned where
n is the number of lines in the first file.
"""
self.assertEqual((2, 0, 0), countCommon(lines('hey you'), lines()))
def testBothEmpty(self):
"""
If both files are empty, (0, 0, 0) must be returned.
"""
self.assertEqual((0, 0, 0), countCommon(lines(), lines()))