---
title: "Discussion on \"Offline-First Sync Failures That Flight Mode Won't Show You\" | Hashnode"
description: "Discussion on \"Offline-First Sync Failures That Flight Mode Won't Show You\". Clock skew, deletes that come back, duplicate entries on a flaky connection, and old databases: the tests I added after auditing my own Flutter app.\n\nShort answer: Testing offline-first sync by switch"
url: "https://hashnode.com/posts/offline-first-sync-failures-that-flight-mode-won-t-show-you/6ad5c4793ea4f053b504b73f"
---

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# [Offline-First Sync Failures That Flight Mode Won't Show You](https://aishayy.hashnode.dev/offline-first-sync-failures-that-flight-mode-won-t-show-you?utm_source=hashnode&utm_medium=feed)

Clock skew, deletes that come back, duplicate entries on a flaky connection, and old databases: the tests I added after auditing my own Flutter app. Short answer: Testing offline-first sync by switch

Oct 19 · 9 min read · aishayy.hashnode.dev  
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-   [#flutter](https://hashnode.com/tag/flutter)
-   [#firebase](https://hashnode.com/tag/firebase)
-   [#offline-first](https://hashnode.com/tag/offline-first)
-   [#architecture](https://hashnode.com/tag/architecture)
-   [#testing](https://hashnode.com/tag/testing)

## Written by

[Ayesha Iftikhar](https://hashnode.com/@seayeshaiftikhar)

@seayeshaiftikhar

  
[View profile](https://hashnode.com/@seayeshaiftikhar)

Software Engineer

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