diff --git a/test/loaders/ApiBasedRepositoryLoaderTests.test.ts b/test/loaders/ApiBasedRepositoryLoaderTests.test.ts
index f14a794..177cf8b 100644
--- a/test/loaders/ApiBasedRepositoryLoaderTests.test.ts
+++ b/test/loaders/ApiBasedRepositoryLoaderTests.test.ts
@@ -1,6 +1,7 @@
-import { beforeEach, describe, it, jest, test } from "@jest/globals";
+import { beforeEach, describe, expect, it, jest, test } from "@jest/globals";
 import { ApiBasedRepositoryLoader } from "../../src/loaders/ApiBasedRepositoryLoader";
 import { UnoptimizedInMemoryRepository } from "../../src/repositories/UnoptimizedInMemoryRepository";
+import { getAllSystemsResponse } from "../jsonSnapshots/getAllSystemsResponse";
 
 function updateGlobalFetchMockJson(obj: any) {
   // @ts-ignore
@@ -29,7 +30,17 @@ describe("ApiBasedRepositoryLoader", () => {
 
   describe("fetchAndUpdateSystemData", () => {
     it("updates system data in repository if response received", async () => {
+      const numberOfSystemsInResponse = getAllSystemsResponse.all.length;
+      updateGlobalFetchMockJson(getAllSystemsResponse);
 
+      await loader.fetchAndUpdateSystemData();
+
+      const systems = await loader.repository.getSystems();
+      if (loader.supportedSystemIds.length < numberOfSystemsInResponse) {
+        expect(systems).toHaveLength(loader.supportedSystemIds.length);
+      } else {
+        expect(systems).toHaveLength(numberOfSystemsInResponse);
+      }
     });
 
     it("throws the correct error if the API response contains no data", async () => {