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test_util: add full coverage for mathutil.py

This commit is contained in:
Brian Warner 2007-04-08 12:43:01 -07:00
parent d8b71b85f8
commit 6f4280cc38
1 changed files with 93 additions and 1 deletions
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94
src/allmydata/test/test_util.py
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@ -3,7 +3,7 @@ def foo(): pass # keep the line number constant
from twisted.trial import unittest
from allmydata.util import bencode, idlib, humanreadable
from allmydata.util import bencode, idlib, humanreadable, mathutil
class IDLib(unittest.TestCase):
@ -114,3 +114,95 @@ class Bencode(unittest.TestCase):
bencode.test_unfinished_dict()
bencode.test_unsupported_type()
class Math(unittest.TestCase):
def test_div_ceil(self):
f = mathutil.div_ceil
self.failUnlessEqual(f(0, 1), 0)
self.failUnlessEqual(f(0, 2), 0)
self.failUnlessEqual(f(0, 3), 0)
self.failUnlessEqual(f(1, 3), 1)
self.failUnlessEqual(f(2, 3), 1)
self.failUnlessEqual(f(3, 3), 1)
self.failUnlessEqual(f(4, 3), 2)
self.failUnlessEqual(f(5, 3), 2)
self.failUnlessEqual(f(6, 3), 2)
self.failUnlessEqual(f(7, 3), 3)
def test_next_multiple(self):
f = mathutil.next_multiple
self.failUnlessEqual(f(5, 1), 5)
self.failUnlessEqual(f(5, 2), 6)
self.failUnlessEqual(f(5, 3), 6)
self.failUnlessEqual(f(5, 4), 8)
self.failUnlessEqual(f(5, 5), 5)
self.failUnlessEqual(f(5, 6), 6)
self.failUnlessEqual(f(32, 1), 32)
self.failUnlessEqual(f(32, 2), 32)
self.failUnlessEqual(f(32, 3), 33)
self.failUnlessEqual(f(32, 4), 32)
self.failUnlessEqual(f(32, 5), 35)
self.failUnlessEqual(f(32, 6), 36)
self.failUnlessEqual(f(32, 7), 35)
self.failUnlessEqual(f(32, 8), 32)
self.failUnlessEqual(f(32, 9), 36)
self.failUnlessEqual(f(32, 10), 40)
self.failUnlessEqual(f(32, 11), 33)
self.failUnlessEqual(f(32, 12), 36)
self.failUnlessEqual(f(32, 13), 39)
self.failUnlessEqual(f(32, 14), 42)
self.failUnlessEqual(f(32, 15), 45)
self.failUnlessEqual(f(32, 16), 32)
self.failUnlessEqual(f(32, 17), 34)
self.failUnlessEqual(f(32, 18), 36)
self.failUnlessEqual(f(32, 589), 589)
def test_pad_size(self):
f = mathutil.pad_size
self.failUnlessEqual(f(0, 4), 0)
self.failUnlessEqual(f(1, 4), 3)
self.failUnlessEqual(f(2, 4), 2)
self.failUnlessEqual(f(3, 4), 1)
self.failUnlessEqual(f(4, 4), 0)
self.failUnlessEqual(f(5, 4), 3)
def test_is_power_of_k(self):
f = mathutil.is_power_of_k
for i in range(1, 100):
if i in (1, 2, 4, 8, 16, 32, 64):
self.failUnless(f(i, 2), "but %d *is* a power of 2" % i)
else:
self.failIf(f(i, 2), "but %d is *not* a power of 2" % i)
for i in range(1, 100):
if i in (1, 3, 9, 27, 81):
self.failUnless(f(i, 3), "but %d *is* a power of 3" % i)
else:
self.failIf(f(i, 3), "but %d is *not* a power of 3" % i)
def test_next_power_of_k(self):
f = mathutil.next_power_of_k
self.failUnlessEqual(f(0,2), 1)
self.failUnlessEqual(f(1,2), 1)
self.failUnlessEqual(f(2,2), 2)
self.failUnlessEqual(f(3,2), 4)
self.failUnlessEqual(f(4,2), 4)
for i in range(5, 8): self.failUnlessEqual(f(i,2), 8, "%d" % i)
for i in range(9, 16): self.failUnlessEqual(f(i,2), 16, "%d" % i)
for i in range(17, 32): self.failUnlessEqual(f(i,2), 32, "%d" % i)
for i in range(33, 64): self.failUnlessEqual(f(i,2), 64, "%d" % i)
for i in range(65, 100): self.failUnlessEqual(f(i,2), 128, "%d" % i)
self.failUnlessEqual(f(0,3), 1)
self.failUnlessEqual(f(1,3), 1)
self.failUnlessEqual(f(2,3), 3)
self.failUnlessEqual(f(3,3), 3)
for i in range(4, 9): self.failUnlessEqual(f(i,3), 9, "%d" % i)
for i in range(10, 27): self.failUnlessEqual(f(i,3), 27, "%d" % i)
for i in range(28, 81): self.failUnlessEqual(f(i,3), 81, "%d" % i)
for i in range(82, 200): self.failUnlessEqual(f(i,3), 243, "%d" % i)
def test_ave(self):
f = mathutil.ave
self.failUnlessEqual(f([1,2,3]), 2)
self.failUnlessEqual(f([0,0,0,4]), 1)
self.failUnlessAlmostEqual(f([0.0, 1.0, 1.0]), .666666666666)