Error when trying to run tests: unsupported module was defined

Uncaught Error: an unsupported module was defined, expected define(id, deps, module) instead got: 1 arguments to define` at http://localhost:7357/assets/vendor.js, line 64

https://github.com/simplabs/qunit-dom/pull/970 is trying to update the embroider dependency in qunit-dom, but it fails with the above error and ember test ultimately timing out.

The stack trace of the error is pointing to https://github.com/emberjs/ember-test-helpers/pull/958 being the problem. It looks like the es6-promise import there is not working correctly.

Note that this only happens in combination with the new ember-qunit v5 setup. With ember-qunit v4 this is not an issue because the test-helpers PR above was only added in v2.x, which is not used by ember-qunit v4.

/cc @rwjblue @ef4

[ctjhoa]

In @mansona case, there was a missing explicit dependency to ember-auto-import. https://github.com/mansona/ember-cli-notifications/pull/310

[ef4]

This is due to https://github.com/embroider-build/embroider/issues/731#issuecomment-808788950

You can use embroider’s skipBabel option to workaround.

skipBabel: [
  {
    package: 'qunit',
  },
],