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test: add testutil.flip_one_bit which flips a randomly chosen bit of the input string

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Zooko O'Whielacronx 2008-07-28 16:42:17 -07:00
parent fe522e31a4
commit 9d14341c7d
1 changed files with 8 additions and 0 deletions
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8
src/allmydata/util/testutil.py
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@ -1,4 +1,5 @@
import os, signal, time import os, signal, time
from random import randrange
from twisted.internet import reactor, defer, task from twisted.internet import reactor, defer, task
from twisted.python import failure from twisted.python import failure
@ -12,6 +13,13 @@ def flip_bit(good, which):
pieces = good[:which], good[which:which+1], good[which+1:] pieces = good[:which], good[which:which+1], good[which+1:]
return pieces[0] + chr(ord(pieces[1]) ^ 0x01) + pieces[2] return pieces[0] + chr(ord(pieces[1]) ^ 0x01) + pieces[2]
def flip_one_bit(s):
# flip one random bit of the string s
i = randrange(0, len(s))
result = s[:i] + chr(ord(s[i])^(0x01<<randrange(0, 8))) + s[i+1:]
assert result != s, "Internal error -- flip_one_bit() produced the same string as its input: %s == %s" % (result, s)
return result
class SignalMixin: class SignalMixin:
# This class is necessary for any code which wants to use Processes # This class is necessary for any code which wants to use Processes
# outside the usual reactor.run() environment. It is copied from # outside the usual reactor.run() environment. It is copied from