Implement in-memory equivalents of both ETA repositories

src/repositories/shuttle/eta/InMemoryExternalSourceETARepository.ts

@@ -1,13 +1,22 @@
 import { IEta } from "../../../entities/ShuttleRepositoryEntities";
 import { ExternalSourceETARepository } from "./ExternalSourceETARepository";
 import { BaseInMemoryETARepository } from "./BaseInMemoryETARepository";
+import { ETARepositoryEvent } from "./ETAGetterRepository";
 
 export class InMemoryExternalSourceETARepository extends BaseInMemoryETARepository implements ExternalSourceETARepository {
-  addOrUpdateEtaFromExternalSource(eta: IEta): Promise<void> {
-    throw new Error("Method not implemented.");
+  async addOrUpdateEtaFromExternalSource(eta: IEta): Promise<void> {
+    await this.addOrUpdateEta(eta);
   }
 
-  removeEtaIfExists(shuttleId: string, stopId: string): Promise<IEta | null> {
-    throw new Error("Method not implemented.");
+  async removeEtaIfExists(shuttleId: string, stopId: string): Promise<IEta | null> {
+    const index = this.etas.findIndex((e) => e.stopId === stopId && e.shuttleId === shuttleId);
+    if (index === -1) {
+      return null;
+    }
+
+    const removedEta = this.etas[index];
+    this.etas.splice(index, 1);
+    this.emit(ETARepositoryEvent.ETA_REMOVED, removedEta);
+    return removedEta;
   }
 }