test(cron): Add unit tests for CronWorker

[irvinlim]

Adds unit tests for CronWorker.

[codecov]

Codecov Report

Merging #39 (f7d0ae1) into main (7b79cd4) will increase coverage by 2.16%.
The diff coverage is 65.57%.

@@            Coverage Diff             @@
##             main      #39      +/-   ##
==========================================
+ Coverage   49.73%   51.89%   +2.16%     
==========================================
  Files         161      162       +1     
  Lines        7991     8024      +33     
==========================================
+ Hits         3974     4164     +190     
+ Misses       3834     3664     -170     
- Partials      183      196      +13     

Impacted Files	Coverage Δ
...execution/controllers/croncontroller/controller.go	23.68% <0.00%> (-0.65%)	⬇️
...xecution/controllers/croncontroller/cron_worker.go	71.24% <58.82%> (ø)
pkg/utils/testutils/klog.go	60.00% <60.00%> (ø)
...g/execution/controllers/croncontroller/informer.go	71.15% <100.00%> (+71.15%)	⬆️
pkg/execution/controllers/croncontroller/ticker.go	100.00% <100.00%> (ø)
.../runtime/controllercontext/mock/context_configs.go	81.39% <100.00%> (+1.90%)	⬆️
pkg/execution/controllers/croncontroller/util.go	90.90% <0.00%> (+9.09%)	⬆️
...ed/typed/execution/v1alpha1/fake/fake_jobconfig.go	42.25% <0.00%> (+14.08%)	⬆️
pkg/utils/eventhandler/executionv1alpha1.go	40.00% <0.00%> (+20.00%)	⬆️
... and 5 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 7b79cd4...f7d0ae1. Read the comment docs.