test(bindings/js): unfix segfault

[perrin4869]

The os.Exit(0) call will terminate the node process completely and return a 0 status, making it seem like the test passed, but that will also prematurely terminate any running program...

[codecov-commenter]

Codecov Report

Merging #517 (1fbad93) into master (c7c19e3) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #517   +/-   ##
=======================================
  Coverage   83.16%   83.16%           
=======================================
  Files          25       25           
  Lines        6678     6678           
=======================================
  Hits         5554     5554           
  Misses       1071     1071           
  Partials       53       53           

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