[TIP] branch coverage for ternary/guard/default

Ned Batchelder ned at nedbatchelder.com
Fri May 25 16:45:46 PDT 2012

On 5/25/2012 6:31 PM, Jason Keene wrote:
> Hello,
> Is there a tool that can do branch coverage testing of 
> ternary/guard/default expressions. Eg:
> 'happy path' if mostly_true() else 1/0
> mostly_true() or 1/0
> mostly_false() and 1/0
> So if the test suite doesn't hit the 1/0's then it will indicate 
> partial coverage.  I'm new to branch coverage testing and testing 
> python in general so sorry if this is a newb question.
> Jason
Most of the existing coverage tools are based on sys.settrace(), which 
only reports lines being executed, so it provides no visibility into the 
inter-line execution like you want to get.  There are others based on 
AST transformations, but none of them have reached production-quality, 
they are experiments.

I created a proof-of-concept of using settrace() to get bytecode-tracing 
rather than line tracing, but again, it's never been turned into a real 
tool, and in particular, it may not be possible to get useful reporting 
out of it.  If you are interested, it's here: 

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