Update example to include a withoutSlack option

[rabbbit]

In #90 @twelsh-aw found a bug in a new implementation. This turned out to be caused by us mocking time.

Since time mocking will always have some risks this diff proposes to expand the examples we're using - since they use "real" time they should be good enough to cover most basic cases like #90.

In particular:

• we add a "withoutSlack" test so that the exact case reported in #90 doesn't happen. No slack option seems common enough to add it.
• updates "withSlack" example to actually show how slack operates. Due to non-even execution times I'm forced to round the time a bit.

Possible issues:

• test stability: I re-run the test a 1000 times without issues - the timing seems to be stable.
• test duration: in total we're extending the examples by 5ms, which shouldn't be human noticeable.

[codecov[bot]]

Codecov Report

Merging #96 (0917cd8) into main (783ade2) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##              main       #96   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files            4         4           
  Lines           97        97           
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  Hits            97        97           

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[rabbbit]

Hey @storozhukBM WDYT?

[storozhukBM]

@rabbbit looks good