Add abortTransaction command tests

[alinaliBQ]

This change adds tests for the $abortTransaction command operator.

Add command operator tests for $abortTransaction. Tests database $abortTransaction behavior, output collection, syntax, and expected errors.

• Add compatibility test for abortTransaction #410

[alinaliBQ]

Once #560 is merged, I can rebase this PR if there are conflicts.

[documentdb-triage-tool]

🤖 Auto-triaged by documentdb-triage-tool.

Applied: compatibility test, enhancement
Project fields suggested: Component test-coverage · Priority P2 · Effort L · Status In Progress
Confidence: 0.85 (mixed)

Reasoning

component from path globs (test-coverage, test-framework, ci); effort from diff stats (1817+0 LOC, 17 files); LLM: Adds new test coverage for the $abortTransaction command operator, covering behavior, output collection, syntax, and error cases — a meaningful functional addition to the test suite.

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[alinaliBQ]

Rebased PR to get fix from #606

[alinaliBQ]

addressed comments

[alinaliBQ]

@eerxuan Addressed comments. I also applied the commitTransaction PR comments in this PR.

Refactor (mirrors the commitTransaction restructure)

Removed the shared helper indirection so each test's setup → act → assert is visible top to bottom.

• Deleted utils/session_test_case.py — removed SessionTestCase, SessionOp, SessionOperation, and the execute_session_command runner (which bundledlifecycle, branching, and raw asserts).
• Deleted utils/session_command_test_case.py (SessionCommandTestCase) — dead code, unused. This left utils/ with only an empty __init__.py, so the whole utils/ directory was removed.
• test_abortTransaction_core.py — restructured to plain one-def-per-spec(no parametrize, one assertion, insert-only), inline lifecycle:
  • test_abortTransaction_rolls_back_insert
  • test_pre_existing_data_survives_abort
  • test_abortTransaction_empty
  • test_abortTransaction_response_ok
  • Dropped the parametrized op-type rollback variants (update/delete/multi/insert+delete/multiple-inserts/update+insert) — insert proves rollback.
• test_abortTransaction_field_types.py / _comment.py / _writeconcern.py — converted from SessionTestCase to CommandTestCase (command + msg), inline lifecycle (insert → raw abortTransaction command → assertSuccessPartial(result, {"ok": 1.0})).

New behavioral specs (one file per spec, insert-only)

• test_abortTransaction_atomicity.py — cross-collection: aborting rolls back writes to a second collection (neither persists).
• test_abortTransaction_failed_op_blocks_txn.py — after a dup-key (11000 ) write in a txn, a later op in the same txn fails with 251 NoSuchTransaction .
• test_abortTransaction_recovers_session.py — after a failed op + abort, the same session runs and commits a fresh transaction successfully.
• test_abortTransaction_cannot_commit_after_abort.py — committing an already-aborted transaction (same lsid/txnNumber) fails with 251. Driven with explicit session fields on a dedicated throwaway client so the hand-managed session does not disturb the shared client's server-session pool (avoids parallel-run conflicts / CI flake).