move fetch mock helpers to separate file

test/loaders/ApiBasedRepositoryLoaderTests.test.ts

@@ -13,50 +13,16 @@ import {
   fetchShuttleDataSuccessfulResponse
 } from "../jsonSnapshots/fetchShuttleData/fetchShuttleDataSuccessfulResponse";
 import { fetchEtaDataSuccessfulResponse } from "../jsonSnapshots/fetchEtaData/fetchEtaDataSuccessfulResponse";
-
-/**
- * Function to update behavior of the global `fetch` function.
- * Note that the Passio GO API returns status code 200 for failed responses.
- * @param obj
- * @param status
- */
-function updateGlobalFetchMockJson(
-  obj: any,
-  status: number = 200
-) {
-  // @ts-ignore
-  global.fetch = jest.fn(() => {
-    return Promise.resolve({
-      json: () => Promise.resolve(obj),
-      status,
-      ok: status.toString().startsWith("2"), // 200-level codes are OK
-    })
-  }) as jest.Mock;
-}
-
-/**
- * Reset the global fetch function mock's JSON to return an empty object.
- * @param obj
- */
-function resetGlobalFetchMockJson() {
-  updateGlobalFetchMockJson({});
-}
+import {
+  resetGlobalFetchMockJson,
+  updateGlobalFetchMockJson,
+  updateGlobalFetchMockJsonToThrowSyntaxError
+} from "../mockHelpers/fetchMockHelpers";
 
 async function assertAsyncCallbackThrowsApiResponseError(callback: () => Promise<any>) {
   await expect(callback).rejects.toThrow(ApiResponseError);
 }
 
-function updateGlobalFetchMockJsonToThrowSyntaxError() {
-  // @ts-ignore
-  global.fetch = jest.fn(() => {
-    return Promise.resolve({
-      json: () => Promise.reject(new SyntaxError("Unable to parse JSON")),
-      status: 200,
-      ok: true,
-    })
-  }) as jest.Mock;
-}
-
 describe("ApiBasedRepositoryLoader", () => {
   let loader: ApiBasedRepositoryLoader;
 

test/loaders/TimedApiBasedRepositoryLoaderTests.test.ts

@@ -0,0 +1,13 @@
+import { beforeEach, describe } from "@jest/globals";
+import { TimedApiBasedRepositoryLoader } from "../../src/loaders/TimedApiBasedRepositoryLoader";
+import { UnoptimizedInMemoryRepository } from "../../src/repositories/UnoptimizedInMemoryRepository";
+import { resetGlobalFetchMockJson } from "../mockHelpers/fetchMockHelpers";
+
+describe("TimedApiBasedRepositoryLoader", () => {
+  let loader: TimedApiBasedRepositoryLoader;
+
+  beforeEach(() => {
+    loader = new TimedApiBasedRepositoryLoader(new UnoptimizedInMemoryRepository());
+    resetGlobalFetchMockJson();
+  });
+});