add test cases

test/loaders/ApiBasedRepositoryLoaderTests.test.ts

@@ -0,0 +1,80 @@
+import { beforeEach, describe, it, jest, test } from "@jest/globals";
+import { ApiBasedRepositoryLoader } from "../../src/loaders/ApiBasedRepositoryLoader";
+import { UnoptimizedInMemoryRepository } from "../../src/repositories/UnoptimizedInMemoryRepository";
+
+function updateGlobalFetchMockJson(obj: any) {
+  // @ts-ignore
+  global.fetch = jest.fn(() => {
+    return Promise.resolve({
+      json: () => Promise.resolve(obj)
+    })
+  }) as jest.Mock;
+}
+
+/**
+ * Reset the global fetch function mock's JSON to return an empty object.
+ * @param obj
+ */
+function resetGlobalFetchMockJson() {
+  updateGlobalFetchMockJson({})
+}
+
+describe("ApiBasedRepositoryLoader", () => {
+  let loader: ApiBasedRepositoryLoader;
+
+  beforeEach(() => {
+    loader = new ApiBasedRepositoryLoader(new UnoptimizedInMemoryRepository());
+    resetGlobalFetchMockJson();
+  });
+
+  describe("fetchAndUpdateSystemData", () => {
+    it("updates system data in repository if response received", async () => {
+
+    });
+
+    it("throws the correct error if the API response contains no data", async () => {
+
+    });
+  });
+
+  describe("fetchAndUpdateRouteDataForExistingSystems", () => {
+    it("updates route data in repository if there are systems and response received", async () => {
+
+    });
+
+    it("throws the correct error if the API response contains no data", async () => {
+
+    });
+  });
+
+  describe("fetchAndUpdateStopAndPolylineDataForRoutesInExistingSystems", () => {
+    it("updates stop and polyline data if there are systems and response received", async () => {
+
+    });
+
+    it("throws the correct error if the API response contains no data", async () => {
+
+    })
+  });
+
+  describe("fetchAndUpdateShuttleDataForExistingSystems", () => {
+    it("updates shuttle data in repository if there are systems and response received", async () => {
+
+    });
+
+    it("throws the correct error if the API response contains no data", async () => {
+
+    });
+  });
+
+  describe("fetchAndUpdateEtaDataForExistingSystems", () => {
+    it("updates shuttle data in repository if there are systems and response received", async () => {
+
+    });
+
+    it("throws the correct error if the API response contains no data", async () => {
+
+    });
+  });
+});
+