Add orderbook cancellation depth tests

[poorandhungrybutbuthappy]

Summary

Adds focused Go coverage for the orderbook cancellation and snapshot-depth behavior requested in #2.

Changes

• Adds bid cancellation coverage that verifies depth removal and order-index deletion.
• Adds ask cancellation, unknown-order, and closed-book error coverage.
• Adds snapshot immutability coverage for bid and ask level copies.

Testing

• go test ./orderbook from market/ - passed.
• python build.py -m market - passed locally with market build success.
• python3 build.py -m market exited without output in this Windows shell, so I used the same Python 3.12 runtime via python.
• The diagnostic step generated large encrypted split .logd artifacts containing local absolute paths, so I did not commit them publicly. I can provide regenerated diagnostics if the maintainer requires them.

Checklist

• Relevant modules affected by these changes build locally
• Tests pass locally
• Diagnostic build log is committed in this PR
• Documentation has been updated, if applicable
• Configuration or schema changes are documented, if applicable
• No generated build artifacts are committed, except the required diagnostic build log
• Changes are scoped to the PR purpose and avoid unrelated cleanup
• Security, privacy, and error-handling implications have been considered

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• I would like to request that my diagnostic build log is removed before merging

Summary by CodeRabbit

• Tests
  • Added unit tests for OrderBook operations, including order cancellation, error handling for invalid and closed books, and snapshot data integrity verification.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 689c3ac8-292e-43a8-b7bc-da8cb5d8e374

📥 Commits

Reviewing files that changed from the base of the PR and between 2b54872 and 4162088.

📒 Files selected for processing (1)

• market/orderbook/orderbook_test.go

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📝 Walkthrough

Walkthrough

Adds market/orderbook/orderbook_test.go with five unit tests covering CancelOrder (bid/ask level removal, order index cleanup, status update), ErrOrderNotFound for unknown IDs, ErrBookClosed after Close(), and snapshot immutability via GetSnapshot(). Two local helpers construct test OrderBook and *types.Order instances.

Changes

OrderBook Unit Tests

Layer / File(s)	Summary
Test helpers market/orderbook/orderbook_test.go	newTestOrderBook() builds an OrderBook with fixed decimal config; newTestOrder() constructs limit *types.Order values with RemainingQty initialized from the full quantity string.
CancelOrder and closed-book tests market/orderbook/orderbook_test.go	Four tests: cancelling a bid removes the bid level and sets order status to types.Cancelled; cancelling an ask removes the ask level; cancelling an unknown ID returns ErrOrderNotFound; after Close(), both AddOrder and CancelOrder return ErrBookClosed.
Snapshot immutability test market/orderbook/orderbook_test.go	Mutates prices and quantities on a returned snapshot and asserts that a subsequent GetSnapshot() still returns the original values, confirming bid/ask level slices are deep copies.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related issues

• [$40 BOUNTY] [Go] Add order book cancellation depth tests #2 — The PR directly implements all acceptance criteria from this issue: CancelOrder bid/ask level removal, order index updates, ErrOrderNotFound, ErrBookClosed, and snapshot immutability tests.

Poem

🐇 Hoppity-hop through the order book rows,
A bid here cancelled, an ask level goes,
The snapshot stays fresh, no mutation in sight,
ErrBookClosed guards when the market shuts tight.
Each test a small burrow, each assert a seed —
The order book's tidy, precisely agreed! 🌿

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: adding unit tests for orderbook cancellation and snapshot depth behavior.
Description check	✅ Passed	The description covers all required sections with adequate detail: Summary explains the purpose, Changes lists specific test coverage areas, Testing documents local validation results, and the Checklist is substantially complete with clear justification for omissions.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

Warning

There were issues while running some tools. Please review the errors and either fix the tool's configuration or disable the tool if it's a critical failure.

🔧 golangci-lint (2.12.2)

level=error msg="[linters_context] typechecking error: pattern ./...: directory prefix . does not contain main module or its selected dependencies"

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[ghost]

Thanks for the PR. I don't see the encrypted build diagnostic log artifact (*.logd / builds.compact) committed on this branch yet. Please rerun the build diagnostic/encryption step with the fixed encryptly tooling and commit the generated encrypted log artifact to this PR (typically under diagnostic/).

Blocking review until the encrypted diagnostic log artifact is present.