use assert.Contains for result.OneLiner() check to fix flaky test

[ianthpun]

Closes #???

Description

use assert.Contains for result.OneLiner() check to fix flaky test, as sometimes it would run out of order

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For contributor use:

• Targeted PR against master branch
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work
• Code follows the standards mentioned here
• Updated relevant documentation
• Re-reviewed Files changed in the Github PR explorer
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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (cfc51e9) 39.93% compared to head (cce9976) 39.93%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1304   +/-   ##
=======================================
  Coverage   39.93%   39.93%           
=======================================
  Files          39       39           
  Lines        2161     2161           
=======================================
  Hits          863      863           
  Misses       1203     1203           
  Partials       95       95           

Flag	Coverage Δ
unittests	39.93% <ø> (ø)

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[chasefleming]

Awesome, thanks!