Fix unit test stability with testing job name generation

[laurenyu]

Since the job name generation depends on timestamps being unique, if the two names were generated quickly enough, the names could end up being the same despite the code's logic being correct. Adding a sleep statement in the test should fix this.

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[codecov-io]

Codecov Report

Merging #248 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #248   +/-   ##
=======================================
  Coverage   92.29%   92.29%           
=======================================
  Files          49       49           
  Lines        3259     3259           
=======================================
  Hits         3008     3008           
  Misses        251      251

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