Fix the julia test harness for the new API

[timholy]

Slightly embarrassing, but before asking for help on #13 I should have checked that juliatests.jl actually works 😅

[codecov-io]

Codecov Report

Merging #137 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #137   +/-   ##
=====================================
  Coverage       0%     0%           
=====================================
  Files          14     14           
  Lines        1633   1633           
=====================================
  Misses       1633   1633

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