Write test for scanImage()

[RickCarlino]

See title 😛

[coveralls]

Coverage increased (+0.4%) to 21.552% when pulling 27e91f7 on RickCarlino:write_test_for_gabes_pr into 4af7843 on FarmBot:master.

[codecov]

Codecov Report

Merging #363 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #363   +/-   ##
=======================================
  Coverage   95.85%   95.85%           
=======================================
  Files         125      125           
  Lines        1880     1880           
=======================================
  Hits         1802     1802           
  Misses         78       78

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[coveralls]

Coverage increased (+0.4%) to 21.552% when pulling be9634c on RickCarlino:write_test_for_gabes_pr into 4af7843 on FarmBot:master.