```js
// Form.test.js

import { render, fireEvent } from '@testing-library/svelte';

import LoginForm from './LoginForm.svelte';

import { InvalidForm } from './LoginForm.stories'; //👈 Our stories imported here.

it('Checks if the form is valid', async () => {
  const { getByTestId, getByText } = render(LoginForm, {
    props: InvalidForm.args,
  });

  await fireEvent.click(getByText('Submit'));

  const isFormValid = getByTestId('invalid-form');
  expect(isFormValid).toBeInTheDocument();
});
```