Add pytest_test support to rules_python.

[pstradomski]

Ported from https://bitbucket.org/pstradomski/rules_python_extra.

Fixes #240.

[edbaunton]

Is this something that could be reviewed and merged some time soon? We would love to use pytest with Bazel!

[ali5h]

i personally don't think this should be part of rules_python. With a simple macro you can achieve this, check this as an example https://github.com/ali5h/rules_pip/blob/master/defs.bzl

[thundergolfer]

We already use PyTest with Bazel. It works with the standard py_test rule if you add the following snippet to the file run as main.

import pytest
import os
import sys 

...

if __name__ == "__main__":
    dir_path = os.path.dirname(os.path.realpath(__file__))
    sys.exit(pytest.main([dir_path, "-W", "ignore::DeprecationWarning"]))

Compared with other issues we have in our Python-Bazel codebase, this is a minor annoyance.

[pstradomski]

Withdrawing as it seems there's no consensus this is the right approach.

[peloton-mqiu]

https://github.com/ali5h/rules_pip/blob/master/defs.bzl#L139

Hi @ali5h ,
is the link you shared still points to the line you originally intended?
master seems to have advanced, probably you are referring to this rule