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New issue 228: Recwarn empty
https://bitbucket.org
Danilo Bellini:
Problem: Test if a function "creates" warnings or if it don't create any.
Solution:
1. For now, I'm not using "recwarn", since it didn't work in my code.
2. Call the warning creator routine inside a warnings.catch_warnings context
manager.
3. Call warnings.simplefilter("always") before the context manager (somehow, it
don't work when "inside" the context manager).
The code is in:
https://github.com/danilobellini/audiolazy/blob/0fe2586bb81d9bc266998ce478a267a2659d4076/audiolazy/test/test_stream.py#L235
However, I think I should be using the recwarn funcarg. I tryed this:
class TestThub(object):
@p("copies", range(5))
@p("used_copies", range(5))
def test_stream_tee_hub_memory_leak_warning_and_index_error(
self, copies, used_copies, recwarn):
data = Stream(.5, 8, 7 + 2j)
data = thub(data, copies)
assert isinstance(data, StreamTeeHub)
if copies < used_copies:
with pytest.raises(IndexError):
[data * n for n in xrange(used_copies)]
else:
[data * n for n in xrange(used_copies)]
data.__del__()
if copies != used_copies:
w = recwarn.pop()
assert issubclass(w.category, MemoryLeakWarning)
assert str(copies - used_copies) in str(w.message)
assert recwarn.list == []
That did't work: the test in the link works, the test above "misses"/filters
some warn() calls, and an error is given when "recwarn.pop()" is called with an
empty recwarn. But only when used_copies > 0 (i.e., it works when used_copies
== 0 and copies > 0).
Also, the recwarn.list isn't documented anywhere. I wanted to assert "there's
no warning" and found no documented way with recwarn. Perhaps I can use the
pop() method in a try block, but I think the list comparison is simpler.
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