Scenario

• import a slow ESM module
• and it takes ~1 second

Reproduce

$ npm install
$ npm test

Expected

Three tests

  CJS
    ✔ bar
  fastESM
    ✔ bar
  slowESM
    ✔ bar

SUMMARY:
✔ 3 tests completed

Actual

Missing unit test slowESM, but exit with code 0.

  CJS
    ✔ bar
  fastESM
    ✔ bar

SUMMARY:
✔ 2 tests completed