put virtualenv activation during build in comment. That means that for the moment the build machine must be provisionned beforehand, or ansible must be available globally
import { popularity } from 'app-client/helpers/popularity';
import { module, test } from 'qunit';
module('Unit | Helper | popularity');
// Replace this with your real tests.
test('it works', function(assert) {
let result = popularity([42]);
assert.ok(result);
});