Incorrect (testing implementation details):

// tests/integration/components/data-loader-test.js
import { module, test } from 'qunit';
import { setupRenderingTest } from 'ember-qunit';
import { render, click, waitFor } from '@ember/test-helpers';
import DataLoader from 'my-app/components/data-loader';

module('Integration | Component | data-loader', function (hooks) {
  setupRenderingTest(hooks);

  test('it loads data', async function (assert) {
    await render(<template><DataLoader /></template>);

    await click('[data-test-load-button]');

    // BAD: Test knows about implementation details
    // If the component changes from polling every 100ms to 200ms, test breaks
    await waitFor('[data-test-data]', { timeout: 5000 });

    assert.dom('[data-test-data]').hasText('Loaded data');
  });
});