New issue 767: pytest.raises() doesn't always return Exception instance in py26
https://bitbucket.org/pytest-dev/pytest/issue/767/pytestraises-doesnt-always-return
Eric Siegerman:
Typically, the ExceptionInfo.value returned by _pytest.raises()_ (when the
exception is indeed raised) is an Exception instance. But under certain
conditions, it isn't. It looks as though it contains the Exception's _.args_,
rather than the Exception itself. This happens when:
* Python is 2.6 (I've tested with 2.6.6 and 2.6.9), and
* The exception is one of Python's internal ones (I've tested with
ZeroDivisionError, KeyError, and IOError; not sure whether this applies to
others)
* The exception was raised by the interpreter -- if I explicitly `raise
KeyError("msg")`, for example, the test passes
The attached tests demonstrate the problem -- and the more useful behaviour
when you use vanilla _try/except_ instead of _pytest.raises()_. Under Python
2.6, the three _pytest.raises()_ cases fail; under Python 2.7 and 3.4, they
pass. (The _try/except_ tests pass under all three Python versions.)
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