Advice on Testing Services with Effect and What to Focus On

export class ServiceOfferRepositoryLive extends Effect.Service<ServiceOfferRepositoryLive>()(
  'ServiceOfferRepositoryLive',
  {
    dependencies: [DatabaseClient.Default],
    effect: Effect.gen(function* () {
      const dbClient = yield* DatabaseClient;

      const findById = (id: string) => { ... // The implementation }

      return { findById } as const;
    }),
  },
) {
  static Test = makeTestLayer(ServiceOfferRepositoryLive)({});
}