Incorrect (using template tag unnecessarily):

// tests/integration/components/loading-spinner-test.js
import { render } from '@ember/test-helpers';
import LoadingSpinner from 'my-app/components/loading-spinner';

test('it renders', async function (assert) {
  // ❌ Unnecessary template wrapper for component with no args
  await render(
    <template>
      <LoadingSpinner />
    </template>,
  );

  assert.dom('[data-test-spinner]').exists();
});