Orchestrators tests

[thejmazz]

duplicate of #70

[codecov-io]

Codecov Report

Merging #71 into dev will increase coverage by 1.38%.
The diff coverage is 95%.

@@            Coverage Diff             @@
##              dev      #71      +/-   ##
==========================================
+ Coverage   80.49%   81.88%   +1.38%     
==========================================
  Files          36       37       +1     
  Lines         841      861      +20     
  Branches      101      102       +1     
==========================================
+ Hits          677      705      +28     
+ Misses        164      156       -8

Impacted Files	Coverage Δ
lib/constants/default-task-state.js	100% <ø> (ø)	⬆️
lib/reducers/collection.js	85.55% <0%> (ø)	⬆️
lib/watermill.js	90.47% <100%> (ø)	⬆️
lib/orchestrators/join.js	96.49% <100%> (+1.03%)	⬆️
lib/task.js	100% <100%> (ø)	⬆️
lib/lifecycle/generate-uid.js	100% <100%> (ø)	⬆️
lib/orchestrators/orchestrator-uid-generator.js	100% <100%> (ø)
lib/orchestrators/fork.js	100% <100%> (+50%)	⬆️
lib/orchestrators/junction.js	89.28% <75%> (+0.39%)	⬆️

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