feat(xyk): test max in/out ratios

[Roznovjak]

Fixes: #566

[github-actions]

Crate versions that have not been updated:

• pallet-xyk: v6.0.0

Runtime version has not been increased.

[codecov]

Codecov Report

Base: 78.75% // Head: 78.87% // Increases project coverage by +0.12% 🎉

Coverage data is based on head (4bd9640) compared to base (95d54b1).
Patch coverage: 100.00% of modified lines in pull request are covered.

❗ Current head 4bd9640 differs from pull request most recent head b5808ce. Consider uploading reports for the commit b5808ce to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #570      +/-   ##
==========================================
+ Coverage   78.75%   78.87%   +0.12%     
==========================================
  Files          22       22              
  Lines        2104     2116      +12     
==========================================
+ Hits         1657     1669      +12     
  Misses        447      447              

Impacted Files	Coverage Δ
pallets/xyk/src/lib.rs	85.37% <100.00%> (+0.47%)	⬆️

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[Roznovjak]

I had to change the value of MaxOutRatio in one test because I believe it's not possible to reach the limit and test it if the ratios are set to 1/3.