Do not run .mjs in test. Add npm test to CI.

[mcollina]

See nodejs/citgm#837

[mcollina]

This was spuriously introduced in #375, making our CITGM integration moot.

@Ethan-Arrowood please confirm this is not going to break anything for typescript.

[codecov-io]

Codecov Report

Merging #511 (41dfa45) into master (5e51cc4) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #511   +/-   ##
=======================================
  Coverage   99.60%   99.60%           
=======================================
  Files          15       15           
  Lines        1274     1274           
=======================================
  Hits         1269     1269           
  Misses          5        5           

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[Ethan-Arrowood]

Oh huh i wonder why I made that change. No that shouldn't break TS. Maybe that trickled through an invalid rebase or something.

[Ethan-Arrowood]

looks like one CI timed out but its push equivalent run passed.