System.import funcunit somehow stops qunit's beforeEach hook to run

This test fails:
```js
import QUnit from 'steal-qunit';

System.import('funcunit').then(function (F) {
// F.attach(QUnit);
let beforeEachHasRun = false;

QUnit.module('[Functional] System.import funcunit', {
beforeEach(assert) {
beforeEachHasRun = true;
},
afterEach() {
beforeEachHasRun = false;
}
});

QUnit.test('before each ran for this test', function (assert) {
assert.ok(beforeEachHasRun);
});
QUnit.test('before each ran for this test, too', function (assert) {
assert.ok(beforeEachHasRun); //this fails
});
});
```

..notice that the `F.attach(QUnit)` is commented out...