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tests: multi-branch sequential merges compositional flow

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Adds `composite_flow_multi_branch_sequential_merges` covering the
agent-workflow pattern that single-merge tests in `branching.rs`
cannot reach: two feature branches diverging from main with main
writes interleaved between every diverge point, sequential merges
into main, time-travel through the resulting merge DAG, and reopen
consistency over a multi-merge history.

The script (18 numbered steps with assertions per step):
  init+load → mutate main → branch feat-a → mutate main → mutate
  feat-a → branch feat-b → mutate feat-b → mutate feat-a (with
  edge) → merge feat-a → mutate main → merge feat-b → time-travel
  to pre-merge-a + pre-merge-b → reopen + verify.

Catches eight compositional gap categories that only surface with
≥2 merges and main mutations between them: base/LCA recomputation
across two merges, manifest-pin propagation through merge commits,
time-travel through merge DAG without state bleed-through, branch-
DAG consistency, sibling-branch isolation under writes elsewhere,
post-merge main-write integration, multi-merge reopen replay, and
clean-flow recovery-sidecar absence.

`composite_flow.rs` was added to `docs/testing.md` so the before-
every-task checklist points agents at the file before duplicating
coverage.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
Ragnor Comerford 2026-05-05 19:34:04 +02:00
parent 58a3ff0e48
commit 9fc6526ec0
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docs/testing.md
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@ -34,6 +34,7 @@ The engine's `tests/` is the principal coverage surface; most graph-shaped behav
| `lance_version_columns.rs` | Per-row `_row_last_updated_at_version` behavior |
| `failpoints.rs` | Failure-injection coverage (gated on `failpoints` feature). Includes the four per-writer Phase B → recovery integration tests (`recovery_rolls_forward_after_finalize_publisher_failure`, `schema_apply_phase_b_failure_recovered_on_next_open`, `branch_merge_phase_b_failure_recovered_on_next_open`, `ensure_indices_phase_b_failure_recovered_on_next_open`). |
| `recovery.rs` | Open-time recovery sweep — sidecar I/O, classifier dispatch (NoMovement / RolledPastExpected / UnexpectedAtP1 / UnexpectedMultistep / InvariantViolation), all-or-nothing decision, roll-forward via `ManifestBatchPublisher::publish`, roll-back via `Dataset::restore`, audit row in `_graph_commit_recoveries.lance`, `OpenMode::ReadOnly` skip path |
| `composite_flow.rs` | Compositional/narrative end-to-end stories — multi-step flows that compose mechanics covered by other test files. Catches integration regressions where individual operations all pass their unit tests but their composition breaks (sequential merges, post-merge main writes, time-travel through merge DAG, reopen consistency over multi-merge histories). |
## Fixtures