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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>
183 lines
3.0 KiB
Python
183 lines
3.0 KiB
Python
# Test that __set_name__ can access and mutate its owner argument.
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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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# Test basic accesses and mutations.
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class GetSibling:
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def __set_name__(self, owner, name):
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print(getattr(owner, name + "_sib"))
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class GetSiblingTest:
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desc = GetSibling()
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desc_sib = 111
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t110 = GetSiblingTest()
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class SetSibling:
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def __set_name__(self, owner, name):
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setattr(owner, name + "_sib", 121)
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class SetSiblingTest:
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desc = SetSibling()
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t120 = SetSiblingTest()
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print(t120.desc_sib)
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class DelSibling:
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def __set_name__(self, owner, name):
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delattr(owner, name + "_sib")
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class DelSiblingTest:
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desc = DelSibling()
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desc_sib = 131
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t130 = DelSiblingTest()
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try:
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print(t130.desc_sib)
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except AttributeError:
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print("AttributeError")
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class GetSelf:
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x = 211
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def __set_name__(self, owner, name):
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print(getattr(owner, name).x)
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class GetSelfTest:
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desc = GetSelf()
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t210 = GetSelfTest()
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class SetSelf:
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def __set_name__(self, owner, name):
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setattr(owner, name, 221)
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class SetSelfTest:
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desc = SetSelf()
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t220 = SetSelfTest()
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print(t220.desc)
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class DelSelf:
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def __set_name__(self, owner, name):
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delattr(owner, name)
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class DelSelfTest:
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desc = DelSelf()
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t230 = DelSelfTest()
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try:
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print(t230.desc)
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except AttributeError:
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print("AttributeError")
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# Test exception behavior.
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class Raise:
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def __set_name__(self, owner, name):
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raise Exception()
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try:
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class RaiseTest:
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desc = Raise()
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except Exception as e: # CPython raises RuntimeError, MicroPython propagates the original exception
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print("Exception")
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# Ensure removed/overwritten class members still get __set_name__ called.
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class SetSpecific:
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def __init__(self, sib_name, sib_replace):
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self.sib_name = sib_name
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self.sib_replace = sib_replace
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def __set_name__(self, owner, name):
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setattr(owner, self.sib_name, self.sib_replace)
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class SetReplaceTest:
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a = SetSpecific("b", 312) # one of these is changed first
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b = SetSpecific("a", 311)
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t310 = SetReplaceTest()
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print(t310.a)
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print(t310.b)
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class DelSpecific:
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def __init__(self, sib_name):
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self.sib_name = sib_name
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def __set_name__(self, owner, name):
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delattr(owner, self.sib_name)
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class DelReplaceTest:
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a = DelSpecific("b") # one of these is removed first
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b = DelSpecific("a")
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t320 = DelReplaceTest()
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try:
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print(t320.a)
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except AttributeError:
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print("AttributeError")
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try:
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print(t320.b)
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except AttributeError:
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print("AttributeError")
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