diff --git a/test/repositories/ApiBasedRepositoryTests.test.ts b/test/repositories/ApiBasedRepositoryTests.test.ts
index 7eba7bb..180576f 100644
--- a/test/repositories/ApiBasedRepositoryTests.test.ts
+++ b/test/repositories/ApiBasedRepositoryTests.test.ts
@@ -298,15 +298,45 @@ describe("getEtasForShuttleId", () => {
 
 describe("getEtasForStopId", () => {
   test("getEtasForStopId returns correct ETA data", async () => {
+    // Because I'm testing updateEtasForSystemIfTTL separately,
+    // stub it out here
 
+    updateGlobalFetchMockJson(genericEtaDataByStopId);
+
+    const initialCache: ApiBasedRepositoryCache = {
+      etasForStopId: {
+        "177666": [
+          {
+            secondsRemaining: 587,
+            shuttleId: "5577",
+            stopId: "177666",
+            millisecondsSinceEpoch: Date.now(),
+          }
+        ]
+      },
+      etasForShuttleId: {}
+    };
+
+    const ttls: ApiBasedRepositoryMillisecondTTLs = {
+      etasForShuttleId: 100000,
+      etasForStopId: 100000,
+    };
+
+    const repository = new ApiBasedRepository(initialCache, ttls);
+    repository.updateEtasForSystemIfTTL = jest.fn(async () => {
+    });
+    const result = await repository.getEtasForStopId("177666");
+
+    expect(result).toEqual(initialCache.etasForShuttleId);
   });
 
   test("getEtasForStopId returns empty array if no data available", async () => {
+    const repository = new ApiBasedRepository();
+    repository.updateEtasForSystemIfTTL = jest.fn(async () => {
+    });
+    const result = await repository.getEtasForShuttleId("5577");
 
-  });
-
-  test("getEtasForStopId returns old data if not expired", async () => {
-
+    expect(result).toEqual([]);
   });
 });