add test cases for updateEtasForSystemIfTTL

test/repositories/ApiBasedRepositoryTests.test.ts

@@ -340,4 +340,15 @@ describe("getEtasForStopId", () => {
   });
 });
 
+describe("updateEtasForSystemIfTTL", () => {
+  test("updateEtasForSystemIfTTL does nothing if data is not TTL", async () => {
+
+  });
+
+  test("updateEtasForSystemIfTTL updates all ETA data if data is TTL", async () => {
+    // For this one, stub out getStopsBySystemId to return mock data
+
+
+  })
+});