Testing

Use the no-op testing module so @Transactional() methods run without real transactions and @InjectRepository(Member) resolves to your mock:

import { createNoOpTypeOrmTransactionalModule } from '@nestjs-transactions/typeorm/testing';

const repoMock = { save: jest.fn() };
const moduleRef = await Test.createTestingModule({
  imports: [
    createNoOpTypeOrmTransactionalModule({
      manager: { getRepository: () => repoMock },
      entities: [Member],
    }),
  ],
  providers: [MemberService],
}).compile();

createNoOpTypeOrmTransactionalModule is a unit-test replacement for forRoot() + forFeature(): @Transactional() no-ops and @InjectRepository resolves proxies over your mocked manager.getRepository() — no DataSource is created.

To unit-test a NestjsTypeormRepository subclass this way, remember its inherited methods call the manager directly (manager.find(Member, ...), manager.save(Member, ...)) and this.metadata reads manager.connection.getMetadata(...) — so either give the mock manager those methods, or simply override the subclass provider with a mock in the testing module.