Use a common test suite for all modules

[fthomas]

No description provided.

[codecov]

Codecov Report

Merging #414 (6b4d2b7) into master (b578d5d) will decrease coverage by 2.95%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #414      +/-   ##
==========================================
- Coverage   77.14%   74.19%   -2.95%     
==========================================
  Files           5        5              
  Lines          35       31       -4     
  Branches        4        3       -1     
==========================================
- Hits           27       23       -4     
  Misses          8        8              

Impacted Files	Coverage Δ
...cala/eu/timepit/fs2cron/calev/CalevScheduler.scala	42.85% <ø> (-12.70%)	⬇️
.../src/main/scala/eu/timepit/fs2cron/Scheduler.scala	100.00% <ø> (ø)
...timepit/fs2cron/cronutils/CronUtilsScheduler.scala	100.00% <ø> (ø)
...la/eu/timepit/fs2cron/cron4s/Cron4sScheduler.scala	42.85% <ø> (-12.70%)	⬇️
...la/eu/timepit/fs2cron/ZonedDateTimeScheduler.scala	100.00% <100.00%> (ø)

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