macOS multiprocessing bugfix

[shoubhikraj]

Fixes a multiprocessing spawn test that was overlooked in PR #202

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Checklist

• [x] The changes include an associated explanation of how/why
• [ ] Test pass
• [ ] Documentation has been updated
• [ ] Changelog has been updated

[codecov[bot]]

Codecov Report

Merging #278 (61bd866) into v1.4.0 (c8aa7e0) will decrease coverage by 0.04%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           v1.4.0     #278      +/-   ##
==========================================
- Coverage   97.32%   97.29%   -0.04%     
==========================================
  Files         203      203              
  Lines       22055    22055              
==========================================
- Hits        21466    21459       -7     
- Misses        589      596       +7     

Flag	Coverage Δ
unittests	97.29% <100.00%> (-0.04%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
tests/test_utils.py	97.37% <100.00%> (ø)

... and 1 file with indirect coverage changes

[t-young31]

thanks @shoubhikraj