diff --git a/test/loaders/ApiBasedRepositoryLoaderTests.test.ts b/test/loaders/ApiBasedRepositoryLoaderTests.test.ts
index 45a0742..3b7b633 100644
--- a/test/loaders/ApiBasedRepositoryLoaderTests.test.ts
+++ b/test/loaders/ApiBasedRepositoryLoaderTests.test.ts
@@ -63,6 +63,14 @@ describe("ApiBasedRepositoryLoader", () => {
         await loader.fetchAndUpdateSystemData();
       }).rejects.toThrow(ApiResponseError);
     });
+
+    it("throws the correct error if HTTP status code is not 200", async () => {
+      updateGlobalFetchMockJson(fetchSystemDataFailedResponse, 400);
+
+      await expect(async () => {
+        await loader.fetchAndUpdateSystemData();
+      }).rejects.toThrow(ApiResponseError);
+    });
   });
 
   describe("fetchAndUpdateRouteDataForExistingSystems", () => {