Add updated test cases and update call to stop arrival helper

src/repositories/shuttle/RedisShuttleRepository.ts

@@ -437,12 +437,15 @@ export class RedisShuttleRepository extends EventEmitter implements ShuttleGette
     }
   }
 
-  public async getArrivedStopIfExists(shuttle: IShuttle): Promise<IStop | undefined> {
+  public async getArrivedStopIfExists(
+    shuttle: IShuttle,
+    delta = 0.001,
+  ): Promise<IStop | undefined> {
     const orderedStops = await this.getOrderedStopsByRouteId(shuttle.routeId);
 
     for (const orderedStop of orderedStops) {
       const stop = await this.getStopById(orderedStop.stopId);
-      if (stop != null && shuttleHasArrivedAtStop(shuttle, stop)) {
+      if (stop != null && shuttleHasArrivedAtStop(shuttle, stop, delta)) {
         return stop;
       }
       return undefined;
@@ -454,7 +457,7 @@ export class RedisShuttleRepository extends EventEmitter implements ShuttleGette
     throw Error("not implemented");
   }
 
-  private async updateShuttleLastStopArrival(shuttle: IShuttle, lastStopArrival: ShuttleStopArrival) {
+  public async updateShuttleLastStopArrival(shuttle: IShuttle, lastStopArrival: ShuttleStopArrival) {
     // Key: shuttleId:stopId:
     // Value: just a marker (no numerical value)
   }

src/repositories/shuttle/__tests__/RedisShuttleRepository.test.ts

@@ -0,0 +1,37 @@
+import { beforeEach, describe, it } from "@jest/globals";
+import { RedisShuttleRepository } from "../RedisShuttleRepository";
+import { afterEach } from "node:test";
+
+describe("RedisShuttleRepository", () => {
+  let repository: RedisShuttleRepository;
+
+  beforeEach(async () => {
+    repository = new RedisShuttleRepository();
+    await repository.connect();
+  });
+
+  afterEach(async () => {
+    await repository.clearAllData();
+    await repository.disconnect();
+  });
+
+  describe("getArrivedStopIfExists", () => {
+    it("gets the stop that the shuttle is currently at, if exists", async () => {
+
+    });
+
+    it("returns undefined if shuttle is not currently at a stop", async () => {
+
+    });
+  });
+
+  describe("getShuttleLastStopArrival", () => {
+    it("gets the shuttle's last stop if existing in the data", async () => {
+      // Use updateShuttleLastStopArrival to populate data
+    });
+
+    it("returns undefined if the data has never been initialized", async () => {
+      
+    });
+  });
+});