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82db5c81e0
Including the stochastic tests needed to guarantee sensitivity to the potential iterate-while-modifying hazard a naive implementation might have. Signed-off-by: Anson Mansfield <amansfield@mantaro.com>
112 lines
2.3 KiB
Python
112 lines
2.3 KiB
Python
# Test to make sure there's no sequence hazard even when a __set_name__ implementation
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# mutates and reorders the namespace of its owner class.
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# VERY hard bug to prove out except via a stochastic test.
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try:
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from random import choice
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import re
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except ImportError:
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print("SKIP")
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raise SystemExit
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def skip_if_no_descriptors():
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class Descriptor:
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def __get__(self, obj, cls):
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return
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class TestClass:
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Forward = Descriptor()
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a = TestClass()
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try:
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a.__class__
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except AttributeError:
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# Target doesn't support __class__.
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print("SKIP")
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raise SystemExit
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b = a.Forward
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if "Descriptor" in repr(b.__class__):
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# Target doesn't support descriptors.
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print("SKIP")
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raise SystemExit
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skip_if_no_descriptors()
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letters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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# Would be r"[A-Z]{5}", but not all ports support the {n} quantifier.
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junk_re = re.compile(r"[A-Z][A-Z][A-Z][A-Z][A-Z]")
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def junk_fill(obj, n=10): # Add randomly-generated attributes to an object.
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for i in range(n):
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name = "".join(choice(letters) for j in range(5))
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setattr(obj, name, object())
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def junk_clear(obj): # Remove attributes added by junk_fill.
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to_del = [name for name in dir(obj) if junk_re.match(name)]
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for name in to_del:
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delattr(obj, name)
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def junk_sequencer():
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global runs
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try:
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while True:
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owner, name = yield
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runs[name] = runs.get(name, 0) + 1
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junk_fill(owner)
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finally:
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junk_clear(owner)
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class JunkMaker:
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def __set_name__(self, owner, name):
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global seq
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seq.send((owner, name))
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runs = {}
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seq = junk_sequencer()
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next(seq)
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class Main:
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a = JunkMaker()
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b = JunkMaker()
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c = JunkMaker()
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d = JunkMaker()
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e = JunkMaker()
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f = JunkMaker()
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g = JunkMaker()
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h = JunkMaker()
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i = JunkMaker()
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j = JunkMaker()
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k = JunkMaker()
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l = JunkMaker()
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m = JunkMaker()
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n = JunkMaker()
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o = JunkMaker()
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p = JunkMaker()
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q = JunkMaker()
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r = JunkMaker()
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s = JunkMaker()
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t = JunkMaker()
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u = JunkMaker()
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v = JunkMaker()
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w = JunkMaker()
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x = JunkMaker()
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y = JunkMaker()
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z = JunkMaker()
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seq.close()
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for k in letters.lower():
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print(k, runs.get(k, 0))
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