The failures in sympy/utilities/tests/test_pytest.py are due to a
fundamental difference between bin/test and py.test (perhaps this was not a
difference when the tests were written)
The failing tests:
=================================== FAILURES
===================================
___________ test_lack_of_exception_triggers_AssertionError_callable
____________
def test_lack_of_exception_triggers_AssertionError_callable():
try:
> raises(Exception, lambda: 1 + 1)
E Failed: DID NOT RAISE
sympy/utilities/tests/test_pytest.py:14: Failed
_____________ test_lack_of_exception_triggers_AssertionError_with
______________
def test_lack_of_exception_triggers_AssertionError_with():
try:
with raises(Exception):
> 1 + 1
E Failed: DID NOT RAISE
sympy/utilities/tests/test_pytest.py:39: Failed
The cause of these is that the tests are written with the assumption
that when raises fails, it raises and AssertionError. However py.test
raises and actual Failed exception. Here's an example
In [4]: from py.test import fail
In [5]: raise fail()
---------------------------------------------------------------------------
Failed Traceback (most recent call last)
<ipython-input-5-64d514b43c4e> in <module>()
----> 1 raise fail()
/home/peter/miniconda3/lib/python3.4/site-packages/_pytest/runner.py in
fail(msg, pytrace)
466 """
467 __tracebackhide__ = True
--> 468 raise Failed(msg=msg, pytrace=pytrace)
469 fail.Exception = Failed
470
Failed: <Failed instance>
What would be the best way to handle this? Should we add a 'Failed` to the
catch block? It seems like a bad idea to me to catch a Fail in a test and
then do something with it but maybe that's the same as catching the
AssertionError?
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