Fix unit test warning: Couldn't match global mock with pattern

[ghost]

When running the unit tests I get the following warning in the console:

$ npm run test:unit

> [email protected] test:unit /Users/htr/projects/catwalk
> aw --glob test/unit/*.spec.js --src src/logic/*.js --coverage

Loading /Users/htr/projects/catwalk/test/unit/logic.spec.js

  QueryModel
    ✓ should return a valid object for a field


  1 passing (18ms)


=============================== Coverage summary ===============================
Statements   : 85.52% ( 248/290 )
Branches     : 73.2% ( 71/97 )
Functions    : 80% ( 40/50 )
Lines        : 85.38% ( 222/260 )
================================================================================
warnings:

Couldn't match global mock with pattern: *.{scss,less,css} and value: undefined
at (Check your config file)