RFC Improve scenario test case API with constrained assertions

[broadway]

RFC Improve scenario test case API with constrained assertions

[mbadolato]

I definitely like the idea of improving the scenario testing for projectors. I found them a bit cumbersome as well (see here). I didn't read your solution in depth because of time right now, but will be interested in reading it later!

[wjzijderveld]

I can see how this can be very helpful.

Just to make sure I understand how you use Broadway: You have an event that triggers the update of multiple read models (where you updated a single property)? And (in above example) you want to assert for all read models just the state of a single property?

I'm not really familiar with MultipleIterator, is it correct that you would need the same amount of asserts as there are read models? I guess that your example has a possible fatal error when you run out of constraints but have read models left?

But I would be in favor of this change and in my opinion it can be implemented in the current then methods. Like you said, we can map to equalTo when a values is not a constraint.

[othillo]

I'm closing this for now. A PR is more than welcome!