Remove repeated imports of mock

[Jonnymcc]

I am not sure why mock is imported multiple times but the tests pass even without them. If there is a good reason to keep them then this could be closed. Otherwise for readability I think they should be removed.

[codecov]

Codecov Report

Merging #936 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #936   +/-   ##
=======================================
  Coverage   66.55%   66.55%           
=======================================
  Files          14       14           
  Lines        1438     1438           
  Branches      226      226           
=======================================
  Hits          957      957           
  Misses        430      430           
  Partials       51       51

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[aldenpeterson-wf]

I'm fine with this, I'd guess what happened was:

1. A single test got written with the inline import
2. That test got copied everywhere
3. Someone realized "hey we can global import"
4. Step 2 never got cleaned up

[cgoldberg]

LGTM