Use tokio's testing feature to advance time of rate limitter

[kannapoix]

This closes #56, but with not the way the issue suggested.

Use tokio::time::advance instead of manually updating rate_limiter.last_update.
I removed a mock because I don't see any necessity of it, but maybe overlooked something.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 0.00%. Comparing base (1cf2906) to head (adac81a).
Report is 4 commits behind head on master.

Additional details and impacted files

@@          Coverage Diff           @@
##           master    #168   +/-   ##
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  Coverage    0.00%   0.00%           
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  Files           1       1           
  Lines         126     126           
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  Misses        126     126           

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[dunxen]

Thanks!

This looks like a simple solution since we already have tokio as a dependency and this is just for testing. The less test utils we have to manually write, the better (in my opinion) so long as the dependency is justified (which it is in this case!)

I'll have a proper review of this today as I'm not 100% familiar with the util. Just catching up on things.

[dunxen]

Apologies for letting this slip!

I'm happy to have this extra dependency for testing. It has pretty simple usage too!

Thanks 🙏