added testURL to jest config

[tristanHessell]

Tests were failing on my local - fix was found:
jestjs/jest#6769 (comment)

[codecov]

Codecov Report

Merging #147 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #147   +/-   ##
======================================
  Coverage    89.1%   89.1%           
======================================
  Files           4       4           
  Lines         101     101           
  Branches       25      25           
======================================
  Hits           90      90           
  Misses          9       9           
  Partials        2       2

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[ctrlplusb]

Awesome thanks! 👍