如何在beforeEach中模拟Knex (Knex)

const knex = require('knex');
const { mock } = require('mock-knex');

beforeEach(() => {
  const db = knex({
    client: 'mysql',
    connection: {
      host: 'localhost',
      user: 'username',
      password: 'password',
      database: 'database_name'
    }
  });

  mock(db);
});

it('should fetch data from the database', async () => {
  const expectedData = [{ id: 1, name: 'John' }];

  mock.on('query', (query) => {
    query.response(expectedData);
  });

  const result = await db.select().from('users');

  expect(result).toEqual(expectedData);
});