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POpy.test: how to automatically detect an exception in a child process?
 

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    <p>I'm running py.test on Linux in the context of a module that makes heavy usage of multiprocessing. Exceptions in child processes are not detected as an error. Example test file <code>pytest_mp_test.py</code>:</p> <pre><code>import multiprocessing def test_mp(): p = multiprocessing.Process(target=child) p.start() p.join() def child(): assert False </code></pre> <p>Execution:</p> <pre><code>$ py.test pytest_mp_test.py ================================== test session starts =================================== platform linux2 -- Python 2.7.3 -- pytest-2.3.3 plugins: cov collected 1 items pytest_mp_test.py . ================================ 1 passed in 0.04 seconds ================================ </code></pre> <p>No error detected. The exception is printed when invoked with <code>-s</code>:</p> <pre><code>$ py.test -s pytest_mp_test.py ================================== test session starts =================================== platform linux2 -- Python 2.7.3 -- pytest-2.3.3 plugins: cov collected 1 items pytest_mp_test.py Process Process-1: Traceback (most recent call last): File "/apps11/bioinfp/Python-2.7.3/lib/python2.7/multiprocessing/process.py", line 258, in _bootstrap self.run() File "/apps11/bioinfp/Python-2.7.3/lib/python2.7/multiprocessing/process.py", line 114, in run self._target(*self._args, **self._kwargs) File "/home/bioinfp/jang/hobbyproggorn/gevent-messagepipe/gevent-messagepipe/pytest_mp_test.py", line 9, in child assert False AssertionError: assert False . ================================ 1 passed in 0.04 seconds ================================ </code></pre> <p>When I manually review the test log, I realize when there is a problem. However, <strong>I am wondering if there a neat way to automate exception detection in a child with py.test.</strong></p> <p>Must I verify the child's exit code in the parent? Is this the only way?</p>
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