test: Add wallet reorg test during assumeutxo background sync #34535

1. 
   b-l-u-e commented at 9:23 pm on February 8, 2026: contributor

   This PR adds a test that verifies wallet balance consistency when a chain reorg occurs while assumeutxo background validation is in progress

   motivation currently test file tests wallet functionality with snapshots but there is no test covering what happens when reorg occurs during background validation phase.

   so what it tests

   • wallet state remains consistent through reorg
   • balance updates when coins are orphaned
2. DrahtBot added the label Tests on Feb 8, 2026
3. 
   DrahtBot commented at 9:24 pm on February 8, 2026: contributor

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   Concept ACK	yuvicc

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   LLM Linter (✨ experimental)

   Possible typos and grammar issues:

   • Restore wallet created at snapshot height it should be empty before sync -> Restore wallet created at snapshot height; it should be empty before sync [run-on sentence missing punctuation; needs a separator or conjunction to be grammatical]
   • Payment is post snapshot and intended to be orphaned by the reorg ensure seen first -> Payment is post-snapshot and intended to be orphaned by the reorg; ensure it is seen first [missing hyphen in “post-snapshot” and a separator plus subject “it” to make the instruction grammatical]

   2026-02-16 20:16:22

4. b-l-u-e marked this as ready for review on Feb 9, 2026
5. in test/functional/wallet_assumeutxo.py:156 in 3a8f776299

   151+        # Build an alternative chain on n0 that excludes the post snapshot wallet payment
   152+        fork_point = SNAPSHOT_BASE_HEIGHT
   153+        orig_height = n0.getblockcount()
   154+        orig_chainwork = int(n0.getblockchaininfo()['chainwork'], 16)
   155+        self.disconnect_nodes(n3.index, n0.index)
   156+        n0.invalidateblock(n0.getblockhash(fork_point + 1))
   

   ---

   ---

   

   yuvicc commented at 5:04 am on February 16, 2026:

   Instead of using invalidateblock directly, we could leverage fork-based reorg testing here so that it matches the real re-org scenario. For more see mempool_updatefromblock.py test.

   ---

   

   b-l-u-e commented at 7:55 pm on February 16, 2026:

   i made changes to use fork-based reorg , thanks for the tip
6. 
   yuvicc commented at 5:05 am on February 16, 2026: contributor

   Concept ACK
7. b-l-u-e force-pushed on Feb 16, 2026
8. test: Add wallet reorg test during assumeutxo background sync

   Signed-off-by: b-l-u-e <winnie.gitau282@gmail.com>

   75368100aa
9. b-l-u-e force-pushed on Feb 16, 2026
10. DrahtBot added the label CI failed on Feb 16, 2026
11. DrahtBot removed the label CI failed on Feb 16, 2026

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