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286 lines
9 KiB
Python
286 lines
9 KiB
Python
from test import support
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import random
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import sys
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import unittest
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verbose = support.verbose
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nerrors = 0
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def CmpToKey(mycmp):
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'Convert a cmp= function into a key= function'
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class K(object):
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def __init__(self, obj):
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self.obj = obj
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def __lt__(self, other):
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return mycmp(self.obj, other.obj) == -1
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return K
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def check(tag, expected, raw, compare=None):
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global nerrors
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if verbose:
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print(" checking", tag)
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orig = raw[:] # save input in case of error
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if compare:
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raw.sort(key=CmpToKey(compare))
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else:
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raw.sort()
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if len(expected) != len(raw):
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print("error in", tag)
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print("length mismatch;", len(expected), len(raw))
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print(expected)
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print(orig)
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print(raw)
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nerrors += 1
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return
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for i, good in enumerate(expected):
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maybe = raw[i]
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if good is not maybe:
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print("error in", tag)
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print("out of order at index", i, good, maybe)
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print(expected)
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print(orig)
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print(raw)
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nerrors += 1
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return
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class TestBase(unittest.TestCase):
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def testStressfully(self):
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# Try a variety of sizes at and around powers of 2, and at powers of 10.
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sizes = [0]
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for power in range(1, 10):
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n = 2 ** power
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sizes.extend(range(n-1, n+2))
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sizes.extend([10, 100, 1000])
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class Complains(object):
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maybe_complain = True
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def __init__(self, i):
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self.i = i
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def __lt__(self, other):
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if Complains.maybe_complain and random.random() < 0.001:
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if verbose:
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print(" complaining at", self, other)
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raise RuntimeError
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return self.i < other.i
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def __repr__(self):
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return "Complains(%d)" % self.i
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class Stable(object):
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def __init__(self, key, i):
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self.key = key
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self.index = i
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def __lt__(self, other):
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return self.key < other.key
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def __repr__(self):
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return "Stable(%d, %d)" % (self.key, self.index)
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for n in sizes:
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x = list(range(n))
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if verbose:
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print("Testing size", n)
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s = x[:]
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check("identity", x, s)
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s = x[:]
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s.reverse()
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check("reversed", x, s)
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s = x[:]
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random.shuffle(s)
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check("random permutation", x, s)
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y = x[:]
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y.reverse()
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s = x[:]
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check("reversed via function", y, s, lambda a, b: (b>a)-(b<a))
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if verbose:
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print(" Checking against an insane comparison function.")
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print(" If the implementation isn't careful, this may segfault.")
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s = x[:]
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s.sort(key=CmpToKey(lambda a, b: int(random.random() * 3) - 1))
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check("an insane function left some permutation", x, s)
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x = [Complains(i) for i in x]
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s = x[:]
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random.shuffle(s)
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Complains.maybe_complain = True
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it_complained = False
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try:
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s.sort()
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except RuntimeError:
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it_complained = True
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if it_complained:
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Complains.maybe_complain = False
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check("exception during sort left some permutation", x, s)
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s = [Stable(random.randrange(10), i) for i in range(n)]
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augmented = [(e, e.index) for e in s]
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augmented.sort() # forced stable because ties broken by index
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x = [e for e, i in augmented] # a stable sort of s
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check("stability", x, s)
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#==============================================================================
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class TestBugs(unittest.TestCase):
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def test_bug453523(self):
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# bug 453523 -- list.sort() crasher.
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# If this fails, the most likely outcome is a core dump.
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# Mutations during a list sort should raise a ValueError.
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class C:
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def __lt__(self, other):
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if L and random.random() < 0.75:
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L.pop()
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else:
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L.append(3)
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return random.random() < 0.5
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L = [C() for i in range(50)]
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self.assertRaises(ValueError, L.sort)
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def test_undetected_mutation(self):
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# Python 2.4a1 did not always detect mutation
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memorywaster = []
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for i in range(20):
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def mutating_cmp(x, y):
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L.append(3)
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L.pop()
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return (x > y) - (x < y)
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L = [1,2]
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self.assertRaises(ValueError, L.sort, key=CmpToKey(mutating_cmp))
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def mutating_cmp(x, y):
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L.append(3)
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del L[:]
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return (x > y) - (x < y)
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self.assertRaises(ValueError, L.sort, key=CmpToKey(mutating_cmp))
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memorywaster = [memorywaster]
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#==============================================================================
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class TestDecorateSortUndecorate(unittest.TestCase):
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def test_decorated(self):
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data = 'The quick Brown fox Jumped over The lazy Dog'.split()
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copy = data[:]
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random.shuffle(data)
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data.sort(key=str.lower)
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def my_cmp(x, y):
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xlower, ylower = x.lower(), y.lower()
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return (xlower > ylower) - (xlower < ylower)
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copy.sort(key=CmpToKey(my_cmp))
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def test_baddecorator(self):
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data = 'The quick Brown fox Jumped over The lazy Dog'.split()
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self.assertRaises(TypeError, data.sort, key=lambda x,y: 0)
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def test_stability(self):
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data = [(random.randrange(100), i) for i in range(200)]
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copy = data[:]
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data.sort(key=lambda t: t[0]) # sort on the random first field
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copy.sort() # sort using both fields
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self.assertEqual(data, copy) # should get the same result
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def test_key_with_exception(self):
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# Verify that the wrapper has been removed
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data = list(range(-2, 2))
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dup = data[:]
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self.assertRaises(ZeroDivisionError, data.sort, key=lambda x: 1/x)
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self.assertEqual(data, dup)
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def test_key_with_mutation(self):
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data = list(range(10))
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def k(x):
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del data[:]
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data[:] = range(20)
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return x
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self.assertRaises(ValueError, data.sort, key=k)
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def test_key_with_mutating_del(self):
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data = list(range(10))
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class SortKiller(object):
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def __init__(self, x):
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pass
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def __del__(self):
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del data[:]
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data[:] = range(20)
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def __lt__(self, other):
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return id(self) < id(other)
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self.assertRaises(ValueError, data.sort, key=SortKiller)
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def test_key_with_mutating_del_and_exception(self):
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data = list(range(10))
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## dup = data[:]
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class SortKiller(object):
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def __init__(self, x):
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if x > 2:
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raise RuntimeError
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def __del__(self):
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del data[:]
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data[:] = list(range(20))
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self.assertRaises(RuntimeError, data.sort, key=SortKiller)
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## major honking subtlety: we *can't* do:
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##
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## self.assertEqual(data, dup)
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##
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## because there is a reference to a SortKiller in the
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## traceback and by the time it dies we're outside the call to
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## .sort() and so the list protection gimmicks are out of
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## date (this cost some brain cells to figure out...).
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def test_reverse(self):
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data = list(range(100))
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random.shuffle(data)
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data.sort(reverse=True)
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self.assertEqual(data, list(range(99,-1,-1)))
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def test_reverse_stability(self):
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data = [(random.randrange(100), i) for i in range(200)]
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copy1 = data[:]
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copy2 = data[:]
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def my_cmp(x, y):
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x0, y0 = x[0], y[0]
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return (x0 > y0) - (x0 < y0)
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def my_cmp_reversed(x, y):
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x0, y0 = x[0], y[0]
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return (y0 > x0) - (y0 < x0)
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data.sort(key=CmpToKey(my_cmp), reverse=True)
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copy1.sort(key=CmpToKey(my_cmp_reversed))
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self.assertEqual(data, copy1)
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copy2.sort(key=lambda x: x[0], reverse=True)
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self.assertEqual(data, copy2)
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#==============================================================================
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def test_main(verbose=None):
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test_classes = (
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TestBase,
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TestDecorateSortUndecorate,
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TestBugs,
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)
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support.run_unittest(*test_classes)
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# verify reference counting
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if verbose and hasattr(sys, "gettotalrefcount"):
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import gc
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counts = [None] * 5
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for i in range(len(counts)):
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support.run_unittest(*test_classes)
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gc.collect()
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counts[i] = sys.gettotalrefcount()
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print(counts)
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if __name__ == "__main__":
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test_main(verbose=True)
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