create-mendix-widget/cli/implementations/DOJO_JS/src/components/__tests__/Counter.test.js

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import React from 'react';
import { render } from '@testing-library/preact';

import Counter from '../Counter';

describe('Counter Component', () => {
  it('should render correctly', () => {
    const props = { dummyKey: 'SOME_DUMMY_KEY' };
    const { container } = render(<Counter {...props} />);
    expect(container.firstChild).toMatchSnapshot();
  });
});