diff --git a/src/repositories/shuttle/eta/InMemoryExternalSourceETARepository.ts b/src/repositories/shuttle/eta/InMemoryExternalSourceETARepository.ts
new file mode 100644
index 0000000..9e6afa4
--- /dev/null
+++ b/src/repositories/shuttle/eta/InMemoryExternalSourceETARepository.ts
@@ -0,0 +1,40 @@
+import { EventEmitter } from "stream";
+import { IEta } from "../../../entities/ShuttleRepositoryEntities";
+import { ETARepositoryEventName, ETARepositoryEventListener } from "./ETAGetterRepository";
+import { ExternalSourceETARepository } from "./ExternalSourceETARepository";
+
+export class InMemoryExternalSourceETARepository extends EventEmitter implements ExternalSourceETARepository {
+  addOrUpdateEtaFromExternalSource(eta: IEta): Promise<void> {
+    throw new Error("Method not implemented.");
+  }
+  removeEtaIfExists(shuttleId: string, stopId: string): Promise<IEta | null> {
+    throw new Error("Method not implemented.");
+  }
+  on<T extends ETARepositoryEventName>(event: T, listener: ETARepositoryEventListener<T>): this {
+    throw new Error("Method not implemented.");
+  }
+  once<T extends ETARepositoryEventName>(event: T, listener: ETARepositoryEventListener<T>): this {
+    throw new Error("Method not implemented.");
+  }
+  off<T extends ETARepositoryEventName>(event: T, listener: ETARepositoryEventListener<T>): this {
+    throw new Error("Method not implemented.");
+  }
+  addListener<T extends ETARepositoryEventName>(event: T, listener: ETARepositoryEventListener<T>): this {
+    throw new Error("Method not implemented.");
+  }
+  removeListener<T extends ETARepositoryEventName>(event: T, listener: ETARepositoryEventListener<T>): this {
+    throw new Error("Method not implemented.");
+  }
+  getEtasForShuttleId(shuttleId: string): Promise<IEta[]> {
+    throw new Error("Method not implemented.");
+  }
+  getEtasForStopId(stopId: string): Promise<IEta[]> {
+    throw new Error("Method not implemented.");
+  }
+  getEtaForShuttleAndStopId(shuttleId: string, stopId: string): Promise<IEta | null> {
+    throw new Error("Method not implemented.");
+  }
+  removeAllListeners(eventName?: string | symbol | undefined): this {
+    throw new Error("Method not implemented.");
+  }
+}