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https://github.com/micropython/micropython.git
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Damien George
6f96d260e6
The webassembly port needs some additional weakref tests due to the fact that garbage collection only happens when Python execution finishes and JavaScript resumes. The `tests/ports/webassembly/heap_expand.py` expected output also needs to be updated because the amount of GC heap got smaller (weakref WTB takes some of the available RAM). Signed-off-by: Damien George <damien@micropython.org>
70 lines
1.4 KiB
Python
70 lines
1.4 KiB
Python
# Test weakref.ref() functionality requiring gc.collect().
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# Should be kept in sync with tests/ports/webassembly/weakref_ref_collect.py.
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try:
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import weakref
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except ImportError:
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print("SKIP")
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raise SystemExit
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# gc module must be available if weakref is.
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import gc
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# Cannot reference non-heap objects.
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for value in (None, False, True, Ellipsis, 0, "", ()):
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try:
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weakref.ref(value)
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except TypeError:
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print(value, "TypeError")
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class A:
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def __str__(self):
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return "<A object>"
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def callback(r):
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print("callback", r())
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def test():
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print("test basic use of ref() with only one argument")
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a = A()
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r = weakref.ref(a)
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print(r())
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a = None
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clean_the_stack = [0, 0, 0, 0]
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gc.collect()
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print(r())
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print("test use of ref() with a callback")
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a = A()
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r = weakref.ref(a, callback)
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print(r())
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a = None
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clean_the_stack = [0, 0, 0, 0]
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gc.collect()
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print(r())
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print("test when weakref gets collected before the object it refs")
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a = A()
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r = weakref.ref(a, callback)
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print(r())
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r = None
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clean_the_stack = [0, 0, 0, 0]
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gc.collect()
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a = None
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print("test a double reference")
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a = A()
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r1 = weakref.ref(a, callback)
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r2 = weakref.ref(a, callback)
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print(r1(), r2())
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a = None
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clean_the_stack = [0, 0, 0, 0]
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gc.collect()
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print(r1(), r2())
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test()
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