[Gravity/Spark/Vortex] Fix errors uncovered by phpunit 5.7

Review Request #511 — Created April 7, 2017 and submitted

pprkut
Lunr
a23cc6b...
lunr

Fix errors uncovered by phpunit 5.7.

Unit tests

tardypad
  1. Ship It!
  2. 
      
smillernl
  1. Ship It!
  2. 
      
pprkut
Review request changed

Status: Closed (submitted)

Change Summary:

Merged into master

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