export default function bar() {
  return 'original bar';
}

import bar from './bar.mts';

export const foo = () => bar();

import assert from 'node:assert/strict';
import { before, describe, it, mock } from 'node:test';

describe('foo', { concurrency: true }, () => {
  let barMock = mock.fn();
  let foo;

  before(async () => {
    const barNamedExports = await import('./bar.mts')
      .then(({ default: _, ...rest }) => rest);

    mock.module('./bar.mts', {
      defaultExport: barMock,
      namedExports: barNamedExports,
    });

    ({ foo } = await import('./foo.mts'));
  });

  it('should do the thing', () => {
    barMock.mock.mockImplementationOnce(()  => 42);

    assert.equal(foo(), 42);
  });
});