child1和child2模块使用命名导出来导出其组件。您应该模拟命名导出组件Child1和Child2。
下面的示例使用无状态功能组件模拟这两个模块及其组件。
例如：
index.tsx：

import { Child1 } from './child1';
import { Child2 } from './child2';

import React from 'react';

export default function App() {
  return (
    <>
      <Child1 />
      <Child2 />
    </>
  );
}

child1.tsx：

import React from 'react';

export function Child1() {
  return <div>child1</div>;
}

child2.tsx：

import React from 'react';

export function Child2() {
  return <div>child2</div>;
}

index.test.tsx：

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

jest.mock('./child1', () => ({ Child1: () => 'mocked child1' }));
jest.mock('./child2', () => ({ Child2: () => 'mocked child2' }));

describe('67636326', () => {
  it('should pass', () => {
    const { container } = render(<App />);
    expect(container).toMatchInlineSnapshot(`
      <div>
        mocked child1
        mocked child2
      </div>
    `);
  });
});

测试结果：

PASS  examples/67636326/index.test.tsx (8.339 s)
  67636326
    ✓ should pass (25 ms)

 › 1 snapshot written.
Snapshot Summary
 › 1 snapshot written from 1 test suite.

Test Suites: 1 passed, 1 total
Tests:       1 passed, 1 total
Snapshots:   1 written, 1 total
Time:        9.454 s

如果您尝试呈现一个modul.export，您应该尝试这种方法

jest.mock('../components/Modal', () => () => <div>ModalMocked</div>);

以促成另一种解决方案