Strange behavior with py.test

[Peter Brady]

I've been trying to get better compatibility with py.test recently and have come across a very strange error:

$ py.test sympy/physics/vector/tests -k test_coordinate_vars -v

============================= test session starts ==============================

platform linux -- Python 3.4.1 -- py-1.4.20 -- pytest-2.5.2 -- /home/ptb/miniconda3/bin/python3

architecture: 64-bit

cache:        yes

ground types: python 

collected 39 items 

sympy/physics/vector/tests/test_frame.py:10: test_coordinate_vars FAILED

=================================== FAILURES ===================================

_____________________________ test_coordinate_vars _____________________________

    def test_coordinate_vars():

        """Tests the coordinate variables functionality"""

>       assert CoordinateSym('Ax', A, 0) == A[0]

E       assert Ax == A_x

E        +  where Ax = CoordinateSym('Ax', A, 0)

sympy/physics/vector/tests/test_frame.py:12: AssertionError

                                DO *NOT* COMMIT!                                

=============== 38 tests deselected by '-ktest_coordinate_vars' ================

=================== 1 failed, 38 deselected in 0.22 seconds ====================

$ py.test sympy/physics/vector/tests/test_frame.py -k test_coordinate_vars -v

============================= test session starts ==============================

platform linux -- Python 3.4.1 -- py-1.4.20 -- pytest-2.5.2 -- /home/ptb/miniconda3/bin/python3

architecture: 64-bit

cache:        yes

ground types: python 

collected 4 items 

sympy/physics/vector/tests/test_frame.py:10: test_coordinate_vars PASSED

================ 3 tests deselected by '-ktest_coordinate_vars' ================

==================== 1 passed, 3 deselected in 2.11 seconds ====================

The same test passes or fails depending on if the test file is specified exactly or if the test is found via py.test collection... Any py.test gurus know why?

[Ronan Lamy]

Le 26/09/14 20:14, Peter Brady a écrit :

The only difference is that in the first case, all the test_ modules are
imported. Calling ReferenceFrame('A') multiple times is the problem,
presumably due to caching shenanigans in CoordinateSym. Here's a test
that shows the issue more clearly:
https://gist.github.com/rlamy/2fcb944ed462164ac4f8

[Peter Brady]

Thanks for clearing that up.  I've made an issue based on your gist https://github.com/sympy/sympy/issues/8121

--
You received this message because you are subscribed to a topic in the Google Groups "sympy" group.
To unsubscribe from this topic, visit https://groups.google.com/d/topic/sympy/OqW6m8xz6Ic/unsubscribe.
To unsubscribe from this group and all its topics, send an email to sympy+unsubscribe@googlegroups.com.
To post to this group, send email to sy...@googlegroups.com.
Visit this group at http://groups.google.com/group/sympy.
To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/5426CDD4.30002%40gmail.com.

For more options, visit https://groups.google.com/d/optout.