Better test for cannula age pill, fix bug for 0 hour age

[sulkaharo]

No description provided.

[codecov-io]

Current coverage is 83.77%

Merging #744 into wip/valuebytime-fix will not affect coverage as of 9ffe5f4

@@            wip/valuebytime-fix    #744   diff @@
===================================================
  Files                        46      46       
  Stmts                      2409    2409       
  Branches                    489     489       
  Methods                     364     364       
===================================================
  Hit                        2018    2018       
  Partial                      17      17       
  Missed                      374     374       

Review entire Coverage Diff

---

Uncovered Suggestions

1. +0.58% via lib/mqtt.js#128...141
2. +0.50% via lib/utils.js#31...42
3. +0.50% via lib/mqtt.js#292...303
4. See 7 more...

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