[pytest-dev] Working with other dependency injection systems

[holger krekel]

Hi Kai,

On Thu, Apr 30, 2015 at 19:28 -0400, Kai Groner wrote:
> Hi testing people!
> 
> I'm trying to figure out how I can test a code base that uses an existing
> dependency injection system.  I've run into two problems, and I have
> solutions for each of them but I think maybe there is a better way, so I'm
> looking for some advice.

Could you provide a simple abstract example?
Here and also in the following i don't really understand the background.

holger



> The first problem is how do I override how a test using this injector is
> called?  I think I want to use the pytest_runtest_call hook, but it still
> tries to invoke the test without the injector.  My current solution is to
> use the experimental hookwrapper mechanism to replace item.obj with a
> partially bound version, then restore it afterward.
> 
> The second problem I'm having is the py.test fixture system is trying to
> resolve arguments that are provided by this other injector.  How can I tell
> it that some of these don't need to be provided?  My current solution is to
> blind py.test with a wrapper function with a *a, **kw signature.  I use
> functools.wraps, so annotations are introspectable for the other injector,
> and delete the __wrapped__ attribute to prevent py.test from introspecting
> it.  Is there a nicer, and perhaps less blunt, way to influence the funcarg
> fixture behaviors?  I've tried a couple things with the
> pytest_collection_modifyitems hook, but haven't gotten anything that works
> yet.
> 
> Other details to know about this injection system:
> - we want to build and teardown the injector with each test
> - we may want to configure the injector differently for some tests
> (possibly with fixture data from py.test)
> 
> 
> 
> Thanks,
> Kai

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