py.test not running any tests when using -n (xdist) #669

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1. pytestbot commented on Feb 17, 2015

   

   pytestbot

   on Feb 17, 2015

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   Original comment by BitBucket: vmalloc, GitHub: vmalloc:

   ---

   Managed to pin the problem on a specific use case: it happens when parameters are different between workers in pytest.mark.parametrize. For instance, the following simple test will reproduce it:

   #!python
   
   import time
   
   import pytest
   
   @pytest.mark.parametrize('param', [time.time(), 1, 2, 3])
   def test_something(param):
       pass
   
   

   It would be helpful to at least get a clear error message explaining why things aren't running...
2. pytestbot commented on Apr 30, 2015

   

   pytestbot

   on Apr 30, 2015

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   Original comment by Rok Garbas (BitBucket: garbas, GitHub: garbas):

   ---

   i also stumble upon this problem. (pytest-2.6.2, pytest-xdist-1.11)
   somebody has any idea how to go about solving this? any pointers would be welcome.
3. pytestbot commented on Apr 30, 2015

   

   pytestbot

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   Original comment by Floris Bruynooghe (BitBucket: flub, GitHub: flub):

   ---

   AFAIK when using xdist the tests collected on all hosts must have exactly the same test IDs. This means you can not have different parameters depending on the host.

   You might be able to work around this in the above example by explicitly giving parameter IDs (which are used to create the test IDs): @pytest.mark.parametrize('param', params=[time.time(), 1, 2, 3], ids=['time', '1', '2', '3']).
4. pytestbot commented on Apr 30, 2015

   

   pytestbot

   on Apr 30, 2015

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   Original comment by Floris Bruynooghe (BitBucket: flub, GitHub: flub):

   ---

   Actually, I believe this is a duplicate of issue #594.
5. pytestbot commented on Apr 30, 2015

   

   pytestbot

   on Apr 30, 2015

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   Original comment by Rok Garbas (BitBucket: garbas, GitHub: garbas):

   ---

   same error is also present in pytest-2.7.0
6. pytestbot

   added

   type: bugproblem that needs to be addressedproblem that needs to be addressed

   on Jun 15, 2015
7. The-Compiler commented on Jul 8, 2015

   

   The-Compiler

   on Jul 8, 2015

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   When I run this with an up-to-date pytest and pytest-xdist, I get an error message instead:

   ================================== ERRORS ===================================
   ___________________________ ERROR collecting gw0 ____________________________
   Different tests were collected between gw2 and gw0. The difference is:
   --- gw2
   
   +++ gw0
   
   @@ -1,4 +1,4 @@
   
   -foo.py::test_something[1436343943.2776034]
   +foo.py::test_something[1436343943.234645]
    foo.py::test_something[1]
    foo.py::test_something[2]
    foo.py::test_something[3]
   ___________________________ ERROR collecting gw1 ____________________________
   Different tests were collected between gw2 and gw1. The difference is:
   --- gw2
   
   +++ gw1
   
   @@ -1,4 +1,4 @@
   
   -foo.py::test_something[1436343943.2776034]
   +foo.py::test_something[1436343943.2553692]
    foo.py::test_something[1]
    foo.py::test_something[2]
    foo.py::test_something[3]
   ___________________________ ERROR collecting gw3 ____________________________
   Different tests were collected between gw2 and gw3. The difference is:
   --- gw2
   
   +++ gw3
   
   @@ -1,4 +1,4 @@
   
   -foo.py::test_something[1436343943.2776034]
   +foo.py::test_something[1436343943.3050516]
    foo.py::test_something[1]
    foo.py::test_something[2]
    foo.py::test_something[3]
   

   So can this be closed, @garbas?
8. pfctdayelise

   added

   topic: parametrizerelated to @pytest.mark.parametrizerelated to @pytest.mark.parametrize

   on Jul 25, 2015
9. RonnyPfannschmidt commented on Jan 1, 2016

   

   RonnyPfannschmidt

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   Closing as duplicate of #920
10. RonnyPfannschmidt

    closed this as completedon Jan 1, 2016