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from pylru import *
import random
# This tests PyLRU by fuzzing it with random operations, then checking the
# results against another, simpler, LRU cache implementation.
class simplelrucache:
def __init__(self, size):
# Initialize the cache as empty.
self.cache = []
self.size = size
def __contains__(self, key):
for x in self.cache:
if x[0] == key:
return True
return False
def __getitem__(self, key):
for i in range(len(self.cache)):
x = self.cache[i]
if x[0] == key:
del self.cache[i]
self.cache.append(x)
return x[1]
raise KeyError
def __setitem__(self, key, obj):
for i in range(len(self.cache)):
x = self.cache[i]
if x[0] == key:
x[1] = obj
del self.cache[i]
self.cache.append(x)
return
if len(self.cache) == self.size:
self.cache = self.cache[1:]
self.cache.append([key, obj])
def __delitem__(self, key):
for i in range(len(self.cache)):
if self.cache[i][0] == key:
del self.cache[i]
return
raise KeyError
def test(a, b, c, d, verify):
for i in range(1000):
x = random.randint(0, 512)
y = random.randint(0, 512)
a[x] = y
b[x] = y
verify(c, d)
for i in range(1000):
x = random.randint(0, 512)
if x in a:
assert x in b
z = a[x]
z += b[x]
else:
assert x not in b
verify(c, d)
for i in range(256):
x = random.randint(0, 512)
if x in a:
assert x in b
del a[x]
del b[x]
else:
assert x not in b
verify(c, d)
def testcache():
def verify(a, b):
q = []
z = a.head
for j in range(len(a.table)):
q.append([z.key, z.obj])
z = z.next
assert q == b.cache[::-1]
a = lrucache(128)
b = simplelrucache(128)
test(a, b, a, b, verify)
def wraptest():
def verify(p, q):
assert p == q
p = dict()
q = dict()
x = lruwrap(q, 128)
test(p, x, p, q, verify)
def wraptest2():
def verify(x, y):
pass
p = dict()
q = dict()
x = lruwrap(q, 128, True)
test(p, x, None, None, verify)
x.sync()
assert p == q
def wraptest3():
def verify(x, y):
pass
p = dict()
q = dict()
with lruwrap(q, 128, True) as x:
test(p, x, None, None, verify)
assert p == q
@lrudecorator(25)
def square(x):
return x*x
def testDecorator():
for i in range(1000):
x = random.randint(0, 1493)
assert square(x) == x*x
if __name__ == '__main__':
random.seed()
for i in range(20):
testcache()
wraptest()
wraptest2()
wraptest3()
testDecorator()
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