test: fix instability in polling tests

[markjm]

Fix the instability in polling tests with pausing the watcher due to multiple ticks in the same polling interval.

This will cause the test passes of #205 and #197 to complete successfully.

cc @alexander-akait

[codecov]

Codecov Report

Merging #206 (d7b98c5) into master (c651129) will decrease coverage by 0.48%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #206      +/-   ##
==========================================
- Coverage   92.67%   92.19%   -0.49%     
==========================================
  Files           6        6              
  Lines        1038     1038              
  Branches      245      245              
==========================================
- Hits          962      957       -5     
- Misses         76       81       +5     

Flag	Coverage Δ
integration	92.19% <ø> (-0.49%)	⬇️

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Impacted Files	Coverage Δ
lib/DirectoryWatcher.js	91.93% <0.00%> (-1.07%)	⬇️

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[sokra]

Thanks