Update unit test for RequestTracker

packages/core/core/test/RequestTracker.test.js

@@ -185,14 +185,33 @@ describe('RequestTracker', () => {
     );
   });
 
-  it('should stop writing to cache when the abort controller aborts', async () => {
+  it('should write cache to disk and store index', async () => {
+    let tracker = new RequestTracker({farm, options});
+
+    await tracker.runRequest({
+      id: 'abc',
+      type: 7,
+      run: async ({api}: {api: RunAPI<string | void>, ...}) => {
+        let result = await Promise.resolve();
+        api.storeResult(result);
+      },
+      input: null,
+    });
+
+    await tracker.writeToCache();
+
+    assert(tracker.cachedRequests.size > 0);
+  });
+
+  it('should not write to cache when the abort controller aborts', async () => {
     let tracker = new RequestTracker({farm, options});
 
     const abortController = new AbortController();
     abortController.abort();
 
-    // $FlowFixMe[prop-missing] Rejects is missing on assert type
-    await assert.rejects(tracker.writeToCache(abortController.signal));
+    await tracker.writeToCache(abortController.signal);
+
+    assert(tracker.cachedRequests.size === 0);
   });
 
   it('should not requeue requests if the previous request is still running', async () => {