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I am using py.test for unit testing my python program. I wish to debug my test code with the python debugger the normal way (by which I mean pdb.set_trace() in the code) but I can't make it work.
Putting pdb.set_trace() in the code doesn't work (raises IOError: reading from stdin while output is captured). I have also tried running py.test with the option --pdb but that doesn't seem to do the trick if I want to explore what happens before my assertion. It breaks when an assertion fails, and moving on from that line means terminating the program.
Does anyone know a way to get debugging, or is debugging and py.test just not meant to be together?
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It supports setting (conditional) breakpoints and single stepping at the source line level, inspection of stack frames, source code listing, and evaluation of arbitrary Python code in the context of any stack frame. It also supports post-mortem debugging and can be called under program control.
Python has a built-in debugger called pdb . It's a simple utility with a command line interface that does the main job. It has all the debugger features you'll need, but if you're looking to pimp it up a little, you can extend it using ipdb, which will provide the debugger with features from IPython.
it's real simple: put an assert 0 where you want to start debugging in your code and run your tests with:
py.test --pdb done :)
Alternatively, if you are using pytest-2.0.1 or above, there also is the pytest.set_trace() helper which you can put anywhere in your test code. Here are the docs. It will take care to internally disable capturing before sending you to the pdb debugger command-line.
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I found that I can run py.test with capture disabled, then use pdb.set_trace() as usual.
> py.test --capture=no ============================= test session starts ============================== platform linux2 -- Python 2.5.2 -- pytest-1.3.3 test path 1: project/lib/test/test_facet.py project/lib/test/test_facet.py ...> /home/jaraco/projects/project/lib/functions.py(158)do_something() -> code_about_to_run('') (Pdb) If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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