deltaA test examples

[nemo83]

Hey! Great work on this project, I learned a lot and tried to write some code to reproduce this.

The only thing I'm not sure about is whether deltaA I'm calculating is correct.

I've seen you have something already in the tests, but I can't see actual tests where you test the deltaA calculated for a given pairs of pools. Any chance you can provide a couple of test cases with actual deltaA? Maybe one with a positive delta and one with a negative one.

Thank you and much appreciated again.