No output, even with `py.test -s`

Question

I would like to use py.test combined with hunter:

PYTHONHUNTER="module_startswith='foo'" py.test -s -k test_bar

Unfortunately the output (trace) of hunter is not visible.

Version:

foo_cok_d@aptguettler:~$ py.test --version

This is pytest version 3.4.2, imported from /home/foo_cok_d/local/lib/python2.7/site-packages/pytest.pyc
setuptools registered plugins:
  pytest-xdist-1.22.2 at /home/foo_cok_d/local/lib/python2.7/site-packages/xdist/looponfail.py
  pytest-xdist-1.22.2 at /home/foo_cok_d/local/lib/python2.7/site-packages/xdist/plugin.py
  pytest-forked-0.2 at /home/foo_cok_d/local/lib/python2.7/site-packages/pytest_forked/__init__.pyc

In a simpler (smaller) virtualenv it works (same pytest version, but no plugins).

What could be the reason?

How to debug this?

Docs seem to state you need to do `PYTHONHUNTER="Q(module_startswith='foo')"`. Did you try that? Also, is that the complete trace? — dan-klasson, Feb 28 '19 at 09:35
@dan-klasson `PYTHONHUNTER="module_startswith='foo'" ` is a valid syntax. It works for command line scripts. But not for pytest. What do you mean with "is that the complete trace?" ? — guettli, Feb 28 '19 at 09:53
Stacktrace I mean. This looks very specific to the library. I'd post it as a issue on their github — dan-klasson, Feb 28 '19 at 09:54
@dan-klasson there is no stacktrace. Just a verbose `--version` output. — guettli, Feb 28 '19 at 10:20
@georgexsh thank you very much for checking this. Maybe a pytest plugin is fooling me here. — guettli, Feb 28 '19 at 16:11

score 9 · Accepted Answer · answered Feb 28 '19 at 14:48

I found a work-around.

If I these two lines, then the -s option (shortcut for --capture=no) for py.test works.

    def test_when_the_moon_is_in_the_seventh_house(self):
+        import hunter
+        hunter.trace(module_startswith='modlink')
        ...

And I will see the race, and I am happy.

A solution without modifying the source code would be nice.

score 0 · Answer 2 · answered Mar 06 '19 at 12:39

0

Use respective pytest options for debugging:

pytest -v --tb=long
Run program in debug mode with breakpoints in your IDE.

Example: How to debug in PyCharm.

answered Mar 06 '19 at 12:39

Max Voitko

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No output, even with `py.test -s`

2 Answers2