Thanks for your ideas Floris, I've managed to get it working with your pytest_configure suggestion.
The only extra bit was having to disable reading the cached pyc files that pytest writes, as these skip my monkeypatch. Take a look, it's simple to use: https://gist.github.com/tomviner/c3537c2f2b2b8172f83e If there's any demand, I could easily make this a pip installable pytest plugin. On 13 November 2014 at 23:34, Floris Bruynooghe <f...@devork.be> wrote: > Hi Tom, > > On 9 November 2014 19:18, Tom Viner <t...@viner.tv> wrote: > > The four options I can think of to gain access to this variable: > > - monkey patch rewrite.rewrite_asserts > > - edit rewrite_asserts and paste in the logging code above: > > -- temporarily, by each developer, on each occasion required > > -- permanently, but only running when a certain debug flag is active > > - expose the rewritten AST via a new hook > > > > monkey patch is my preferred option, because if I can make it work, a > plugin > > could be written. I just need some help to find an appropriate hook to do > > the monkey patching before pytest gets going with the > AssertionRewritingHook > > and calls rewrite_asserts. Without knowledge of an early-running hook, I > > could only get this working by patching rewrite_asserts then calling > > pytest.main myself, see > > https://gist.github.com/tomviner/13c95cdb1e159028fc0b > > Would this work by using monkeypatching, but using a method on > _pytest.pytester.TmpTestDir which wraps around inline_run or > inline_runsource? That would seem like a fairly reasonable approach. > It could simply skip with an appropriate message if the meta lib is > importable and print the reversed python code to stdout for capsys to > collect. > > If you would like to go the full plugin way I believe you just need to > hook in before collection happens. I imagine pytest_configure would > be a reasonable hook for that, but have to admit I haven't tried it. > > > Regards, > Floris >
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