const client = {
    getConfigurationItems: jest.fn().mockImplementation(async () => [1, 2, 3, 4]),
};
jest.mock('@package/some-lib', () => ({
    ...jest.requireActual('@package/some-lib'),
    getClient: jest.fn().mockImplementation(() => client),
}));

import someLib from '@package/some-lib';

describe('Describe', () => {
  afterEach(() => {
    jest.restoreAllMocks(); // If comment this line everything is working as expected
  });

  it('test1', () => {
    const client = someLib.getClient();
    await client.getConfigurationItems();
    expect(someLib.getClient).toHaveBeenCalled(); // Passed for the first time
  });

  it('test2', () => {
    const client = someLib.getClient();
    await client.getConfigurationItems();
    expect(someLib.getClient).toHaveBeenCalled(); // Failed
  });
});