test: add functional test for bumpfee with enormous unconfirmed clusters #34961

1. 
   cprkrn commented at 3:34 am on March 31, 2026: none

   Adds functional test coverage for the CheckFeeRate() error path where calculateCombinedBumpFee() returns nullopt (line 84 of feebumper.cpp).

   Creates 9 independent 57-tx unconfirmed chains (each under MAX_CLUSTER_COUNT_LIMIT), has the wallet spend from all of them, and verifies bumpfee returns the expected error when GatherClusters() aggregates >500 total txs.

   Closes #34902

2. DrahtBot added the label Tests on Mar 31, 2026
3. 
   DrahtBot commented at 3:35 am on March 31, 2026: contributor

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4. test: add functional test for bumpfee with enormous unconfirmed clusters

   Add test coverage for the CheckFeeRate() error path where
   calculateCombinedBumpFee() returns nullopt due to GatherClusters()
   finding >500 total transactions across input clusters.
   
   The test creates 9 independent unconfirmed chains (57 txs each, under
   the 64-tx cluster limit), has the wallet spend from all of them (which
   fails to broadcast but stays in the wallet), then verifies bumpfee
   returns the expected error.
   
   Closes #34902

   e991d5be3e
5. cprkrn force-pushed on Mar 31, 2026
6. cprkrn closed this on Mar 31, 2026

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