Typescript 如何为mongo db模型方法重置jest模拟

下面是存储库函数

const documentToObject = (document: CustomerDocument): ICustomerModel => {
 return document.toObject({ getters: true }) as ICustomerModel;
};

const createCustomer = async (
 customer: ICustomerModel
): Promise< ICustomerModel > => {
 try {
  const customerDocument = await CustomerModel.create(customer);
   return documentToObject(customerDocument);
 } catch (error) {
  logger.error('Error while saving customer');
  throw new AppError(ERROR_CODE.FAILED_TO_CREATE_CUSTOMER);
 }
};

在这个错误单元案例之后，如果我对任何其他测试案例使用CustomerRepository.createCustomer，它也会抛出。jest不是在每次测试后清除模拟。我如何解决这个问题

jest.mock('mongoose', () => {
  const mongoose = require.requireActual('mongoose');
  return new mongoose.Mongoose();
});

describe('customer repository', () => {
  let mongod: MongoMemoryServer;
  beforeAll(async () => {
    mongod = new MongoMemoryServer();
    const mongoDbUri = await mongod.getConnectionString();
    await mongoose.connect(mongoDbUri, { useNewUrlParser: true });
  });

  beforeEach(() => {
    jest.resetAllMocks();
  });

  afterEach(async () => {
    expect.hasAssertions();
    await CustomerModel.remove({});
    jest.clearAllMocks();
  });

  afterAll(async () => {
    await mongoose.disconnect();
    await mongod.stop();
  });

  describe('#create customer', () => {
    it('should create a customer', async () => {
      const customer = getCustomer();
      const createdCustomer = await customerRepository.createCustomer(customer);
      expect(createdCustomer.id).toBeDefined();
    });

    it('should throw FAILED_TO_CREATE_CUSTOMER when error while creating customer', async () => {
      //given
      const customer = getCustomer();
      CustomerModel.create = jest
        .fn()
        .mockRejectedValueOnce(new Error('error'));
      await expect(
        customerRepository.createCustomer(
          customer,
        )
      ).rejects.toThrow(ERROR_CODE.FAILED_TO_CREATE_CUSTOMER);
    });
  });
});