[busayo-od]

Description

Adds a regression test for IndexedTxGraph::apply_changeset, which had no direct test coverage. The test verifies that restoring from both accumulated changesets and initial_changeset() correctly restores indexer state, indexes full transactions and floating txouts, and matches the original graph.

The deep transaction pays to an index that is only derivable once the shallow one has revealed a lower index. It sorts first in the changeset, so it is only indexed if the indexer state is applied before the transactions. The test asserts this order. Removing any of the three steps in apply_changeset previously passed the test suite; each now fails this test.

Changelog notice

None (test only).

Checklists

All Submissions:

• I followed the contribution guidelines

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.70%. Comparing base (02b7b12) to head (c8e9f6e).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2465      +/-   ##
==========================================
+ Coverage   83.25%   83.70%   +0.44%     
==========================================
  Files          31       31              
  Lines        6236     6236              
  Branches      293      293              
==========================================
+ Hits         5192     5220      +28     
+ Misses        976      949      -27     
+ Partials       68       67       -1     

Flag	Coverage Δ
rust	83.70% <ø> (+0.44%)	⬆️

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