New issue 596: xdist is not executing tests if their parametrizations were
collected in a different order
https://bitbucket.org/hpk42/pytest/issue/596/xdist-is-not-executing-tests-if-their
liori:
Related to #594, but slightly different.
I generated by parametrizations by iterating over a set of strings. However,
this iteration depends on the specific values the strings hash to, and these
values might be different for every process. Therefore, whereas I was always
generating exactly the same parametrizations, they were in different order.
A simple test case that shows the problem:
```
#!python
import pytest
my_names = {'john', 'kate', 'alfred', 'paul', 'mary'}
@pytest.mark.parametrize('name', list(my_names), ids=list(my_names))
def test_is_name_short(name):
assert len(name) < 7
```
Run with `PYTHONHASHSEED=random py.test -n 4` to make sure you trigger
randomized hashing for strings.
I think that a simple `sort` in `report_collection_diff` before running
`unified_diff` might help with this problem.
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