diff --git a/www/__mocks__/globalMocks.ts b/www/__mocks__/globalMocks.ts
index f13cb274b..62ea1b935 100644
--- a/www/__mocks__/globalMocks.ts
+++ b/www/__mocks__/globalMocks.ts
@@ -1,3 +1,19 @@
 export const mockLogger = () => {
   window['Logger'] = { log: console.log };
 };
+
+let alerts = [];
+
+export const mockAlert = () => {
+  window['alert'] = (message) => {
+    alerts.push(message);
+  };
+};
+
+export const clearAlerts = () => {
+  alerts = [];
+};
+
+export const getAlerts = () => {
+  return alerts;
+};
diff --git a/www/__mocks__/timelineHelperMocks.ts b/www/__mocks__/timelineHelperMocks.ts
index eb9bc834c..53d687968 100644
--- a/www/__mocks__/timelineHelperMocks.ts
+++ b/www/__mocks__/timelineHelperMocks.ts
@@ -109,3 +109,80 @@ export const fakeStartTsOne = -14576291;
 export const fakeEndTsOne = -13885091;
 export const fakeStartTsTwo = 1092844665;
 export const fakeEndTsTwo = 1277049465;
+
+export const readAllCheck = [
+  {
+    ...mockData.phone_data[0].data,
+  },
+];
+
+export const readAllCompositeCheck = [
+  {
+    additions: [],
+    cleaned_section_summary: null,
+    cleaned_trip: null,
+    confidence_threshold: -1,
+    confirmed_trip: null,
+    distance: 777,
+    duration: 777,
+    end_confirmed_place: {
+      key: 'test/value',
+      origin_key: '12345',
+    },
+    end_fmt_time: '2023-11-01T17:55:20.999397-07:00',
+    end_loc: {
+      type: 'Point',
+      coordinates: [-1, -1],
+    },
+    end_local_dt: null,
+    end_place: null,
+    end_ts: -1,
+    expectation: null,
+    expected_trip: null,
+    inferred_labels: [],
+    inferred_section_summary: {
+      count: {
+        CAR: 1,
+        WALKING: 1,
+      },
+      distance: {
+        CAR: 222,
+        WALKING: 222,
+      },
+      duration: {
+        CAR: 333,
+        WALKING: 333,
+      },
+    },
+    inferred_trip: null,
+    key: 'test/value',
+    locations: [
+      {
+        key: 'test/value',
+        origin_key: '12345',
+      },
+    ],
+    origin_key: '12345',
+    raw_trip: null,
+    sections: [
+      {
+        key: 'test/value',
+        origin_key: '12345',
+      },
+    ],
+    source: 'DwellSegmentationDistFilter',
+    start_confirmed_place: {
+      key: 'test/value',
+      origin_key: '12345',
+    },
+    start_fmt_time: '2023-11-01T17:55:20.999397-07:00',
+    start_loc: {
+      type: 'Point',
+      coordinates: [-1, -1],
+    },
+    start_local_dt: null,
+    start_place: null,
+    start_ts: null,
+    user_input: null,
+  },
+];
diff --git a/www/__tests__/timelineHelper.test.ts b/www/__tests__/timelineHelper.test.ts
index 0faac2c2e..e0f424fcf 100644
--- a/www/__tests__/timelineHelper.test.ts
+++ b/www/__tests__/timelineHelper.test.ts
@@ -1,12 +1,17 @@
-import { mockLogger } from '../__mocks__/globalMocks';
+import { clearAlerts, mockAlert, mockLogger } from '../__mocks__/globalMocks';
 import { readAllCompositeTrips, readUnprocessedTrips } from '../js/diary/timelineHelper';
 import { mockBEMUserCache } from '../__mocks__/cordovaMocks';
 
 import * as mockTLH from '../__mocks__/timelineHelperMocks';
 
 mockLogger();
+mockAlert();
 mockBEMUserCache();
 
+beforeEach(() => {
+  clearAlerts();
+});
+
 afterAll(() => {
   jest.restoreAllMocks();
 });
@@ -21,13 +26,13 @@ jest.mock('../js/commHelper', () => ({
 }));
 
 it('works when there are no composite trip objects fetched', async () => {
-  expect(readAllCompositeTrips(-1, -1)).resolves.not.toThrow();
+  expect(readAllCompositeTrips(-1, -1)).resolves.toEqual([]);
 });
 
 it('fetches a composite trip object and collapses it', async () => {
-  expect(
-    readAllCompositeTrips(mockTLH.fakeStartTsOne, mockTLH.fakeEndTsOne),
-  ).resolves.not.toThrow();
+  expect(readAllCompositeTrips(mockTLH.fakeStartTsOne, mockTLH.fakeEndTsOne)).resolves.toEqual(
+    mockTLH.readAllCompositeCheck,
+  );
   expect(
     readAllCompositeTrips(mockTLH.fakeStartTsTwo, mockTLH.fakeEndTsTwo),
   ).resolves.not.toThrow();