diff --git a/test/loaders/ApiBasedRepositoryLoaderTests.test.ts b/test/loaders/ApiBasedRepositoryLoaderTests.test.ts
index ea34042..ed4b92d 100644
--- a/test/loaders/ApiBasedRepositoryLoaderTests.test.ts
+++ b/test/loaders/ApiBasedRepositoryLoaderTests.test.ts
@@ -12,6 +12,7 @@ import { IStop } from "../../src/entities/entities";
 import {
   fetchShuttleDataSuccessfulResponse
 } from "../jsonSnapshots/fetchShuttleData/fetchShuttleDataSuccessfulResponse";
+import { fetchEtaDataSuccessfulResponse } from "../jsonSnapshots/fetchEtaData/fetchEtaDataSuccessfulResponse";
 
 /**
  * Function to update behavior of the global `fetch` function.
@@ -255,7 +256,15 @@ describe("ApiBasedRepositoryLoader", () => {
 
   describe("fetchAndUpdateEtaDataForStopId", () => {
     it("updates ETA data for stop id if response received", async () => {
+      updateGlobalFetchMockJson(fetchEtaDataSuccessfulResponse);
+      const stopId = "177666";
+      // @ts-ignore
+      const etasFromResponse = fetchEtaDataSuccessfulResponse.ETAs[stopId]
 
+      await loader.fetchAndUpdateEtaDataForStopId(stopId);
+
+      const etas = await loader.repository.getEtasForStopId(stopId);
+      expect(etas.length).toEqual(etasFromResponse.length);
     });
 
     it("throws the correct error if the API response contains no data", async () => {