ownerInjection leads to error in service unittest

[jnfingerle]

Hi,

I've got a problem in a big-ish older code base. My minimal test case is this (with a classic class Service):

  test('create with owner (Error)', function(assert) {
    let service = Service.create(this.owner.ownerInjection());
    assert.ok(service);
  });

see https://github.com/jnfingerle/test-addon-ownerinjection/commit/a005a1204f8b6bde619825a187504b8d91cffd89

This leads to an error with the message

Error: Assertion Failed: An EmberObject based class, (unknown), was not instantiated correctly. You may have either used `new` instead of `.create()`, or not passed arguments to your call to super in the constructor: `super(...arguments)`. If you are trying to use `new`, consider using native classes without extending from EmberObject.

I don't know what I did wrong ...

Cheers,
Jan Niklas