update method signatures to not include system id

src/repositories/UnoptimizedInMemoryShuttleRepository.ts

@@ -15,7 +15,7 @@ export class UnoptimizedInMemoryShuttleRepository implements ShuttleGetterSetter
 
   private subscribers: ((eta: IEta) => void)[] = [];
 
-  public async getStops(systemId: string) {
+  public async getStops(): Promise<IStop[]> {
     return this.stops.filter(stop => stop.systemId === systemId);
   }
 
@@ -23,7 +23,7 @@ export class UnoptimizedInMemoryShuttleRepository implements ShuttleGetterSetter
     return this.findEntityById(stopId, this.stops);
   }
 
-  public async getRoutes(systemId: string) {
+  public async getRoutes(): Promise<IRoute[]> {
     return this.routes.filter(route => route.systemId === systemId);
   }
 
@@ -31,7 +31,7 @@ export class UnoptimizedInMemoryShuttleRepository implements ShuttleGetterSetter
     return this.findEntityById(routeId, this.routes);
   }
 
-  public async getShuttles(systemId: string) {
+  public async getShuttles(): Promise<IShuttle[]> {
     return this.shuttles.filter(shuttle => shuttle.systemId === systemId);
   }
 
@@ -43,7 +43,7 @@ export class UnoptimizedInMemoryShuttleRepository implements ShuttleGetterSetter
     return this.findEntityById(shuttleId, this.shuttles);
   }
 
-  public async getEtas(shuttleId: string) {
+  public async getEtasForShuttleId(shuttleId: string): Promise<IEta[]> {
     return this.etas.filter(eta => eta.shuttleId === shuttleId);
   }