Support passing a matrix to parametrize

[goodboy]

This is just an idea.

parametrize() accepts a list of N-tuples to it's argvalues argument. This in turn generates a set of tests from the Cartesian product of the paired tuple's elements.

I propose that support is added to allow argvalues to be a matrix (the underlying data structures are up for debate) generated by the user.
This optionally allows for a user to generate tests only for the pairs of data they are interested in instead of having to filter down from the set of all pairs in pytest_modify_collectitems().

Of course the requirement on argvalues is that it must be a MxN matrix where argnames is of length N.

[nicoddemus]

This in turn generates a set of tests from the Cartesian product of the paired tuple's elements.

A Cartesian product of the argument values is only generated when using multiple parametrize calls, otherwise only the tuples specified in the call are used for parametrization.

Sorry if it is obvious (I should have gone to bed by now), perhaps you can post an example to clarify what you mean?

[goodboy]

@nicoddemus Let me drum up a test and I'll get back to you.
I may have gotten this wrong when I last was dealing with this problem.

[RonnyPfannschmidt]

@tgoodlet sup on this one, can we close?

[goodboy]

@RonnyPfannschmidt i'm pretty sure i found a bug with this so if you don't mind can we keep it open until i re-examine?

[nicoddemus]

@tgoodlet gentle ping. 😁

[goodboy]

@nicoddemus finally back and yes will try to take a look this week!

[nicoddemus]

Cool, let us know if you need help. 👍

[nicoddemus]

@tgoodlet should we close this for now? We can re-open this later when you get the time, no worries.

[goodboy]

@nicoddemus yeah close it if it it helps with your checklists.
I'm way down a different rabbit hole atm and probably won't get back to this in the near term.