```js
// Button.test.js

import React from 'react';
import { render, screen } from '@testing-library/react';
import '@testing-library/jest-dom/extend-expect';

import { Primary } from './Button.stories';

it('renders the button in the primary state', () => {
  render(<Primary {...Primary.args} />);
  expect(screen.getByRole('button')).toHaveTextContent('Primary');
});
```