# Checkpoint 1.3 — Audit and Boundary Docs Complete

**Date:** 2026-05-12  
**Spec:** 0.6.3 Rust-first test migration requirements/design/tasks package  
**Task:** 1.3 — Verify audit and C boundary documents are complete

---

## Verification Summary

Both Phase 1 deliverables exist and are structurally complete.

| Document | Path | Status |
|---|---|---|
| Test surface audit | `docs/project/0.6.3-test-surface-audit.md` | ✅ Present and complete |
| C test boundary | `docs/testing/C_TEST_BOUNDARY.md` | ✅ Present and complete |

---

## Mandatory Directory Coverage Check

All four mandatory audit scope directories are covered in the audit document.
The following table records the actual repository state vs. the audit's claims.

### `components/nginx-module/tests/`

Audit claims: unit (51 files), integration (2), helpers (2), make (1), run.sh (1), Makefile (1) = 58 items.

Actual repository:
- `Makefile` ✅
- `run.sh` ✅
- `unit/` — 51 `.c` files ✅ (exact match)
- `integration/` — `nginx_runtime_integration_test.c`, `run_integration_tests.sh` ✅
- `helpers/` — `headers_standalone.c`, `headers_standalone_types.h` ✅
- `make/` — `targets.mk` ✅
- `build/` — generated output directory; correctly excluded from audit scope ✅

**Finding F1 (minor gap):** The `include/` subdirectory exists in the repository
but is not mentioned in the audit document. It contains:
- `test_common.h`
- `test_metrics_snapshot.h`
- `nginx_stubs/ngx_config.h`
- `nginx_stubs/ngx_core.h`
- `nginx_stubs/ngx_http.h`

These are test infrastructure headers (NGINX stub headers and shared test
helpers), not test source files. They are correctly excluded from the audit's
classification table because the audit scope is test *source files* that
require a migration decision. However, the audit's §11 coverage verification
checklist does not acknowledge this directory. This is a documentation gap,
not a classification gap — no file in `include/` requires a migration
decision. **No action required for 0.6.3; record for future audit template
improvement.**

### `components/nginx-module/tests/e2e/`

Audit claims: 2 Python E2E spec files (both classified Remove).

Actual repository:
- `test_streaming_e2e.py` ✅
- `test_streaming_failure_cache_e2e.py` ✅
- `__pycache__/` — generated; correctly excluded ✅

**Result: exact match.**

### `tools/e2e/`

Audit claims: 16 shell scripts + 1 fixture (5 Migrate to Rust, 1 thin wrapper, 11 Defer).

Actual repository shell scripts:
- `run_e2e_suite.sh` ✅
- `verify_accept_negotiation_e2e.sh` ✅
- `verify_auth_cache_e2e.sh` ✅
- `verify_chunked_streaming_native_e2e.sh` ✅
- `verify_conditional_requests_e2e.sh` ✅
- `verify_config_merge_e2e.sh` ✅
- `verify_error_handling_e2e.sh` ✅
- `verify_huge_body_allowed_native_e2e.sh` ✅
- `verify_huge_body_native_e2e.sh` ✅
- `verify_large_markdown_response_e2e.sh` ✅
- `verify_metrics_endpoint_e2e.sh` ✅
- `verify_proxy_tls_backend_e2e.sh` ✅
- `verify_security_e2e.sh` ✅
- `verify_status_codes_e2e.sh` ✅
- `verify_streaming_e2e.sh` ✅
- `verify_streaming_failure_cache_e2e.sh` ✅

Actual repository fixtures:
- `fixtures/tls_backend_server.py` ✅

**Result: exact match (16 scripts + 1 fixture).**

### `tests/property/`

Audit claims: 3 files (2 Keep as Rust-native, 1 package marker).

Actual repository:
- `__init__.py` ✅
- `test_prometheus_metrics.py` ✅
- `test_reason_codes.py` ✅
- `__pycache__/` — generated; correctly excluded ✅

**Result: exact match.**

---

## C Boundary Document Verification

`docs/testing/C_TEST_BOUNDARY.md` was reviewed against the current repository
structure.

**Coverage of the 7 mandatory concern categories:**

| Category | Concrete examples present | Examples match actual files |
|---|---|---|
| 1. NGINX Module Glue and Lifecycle Hooks | ✅ | ✅ All listed files exist in `unit/` |
| 2. Configuration Parsing and Merge Logic | ✅ | ✅ All listed files exist in `unit/` |
| 3. Header and Body Filter Internals | ✅ | ✅ All listed files exist in `unit/` |
| 4. NGINX Stub Compatibility | ✅ | ✅ All listed files exist in `unit/` |
| 5. ABI and FFI Boundary Validation | ✅ | ✅ All listed files exist in `unit/` and `helpers/` |
| 6. Metrics Internals Tied to C Structures | ✅ | ✅ All listed files exist in `unit/` |
| 7. Sanitizer Smoke Checks | ✅ | ✅ All listed files exist in `unit/` and `make/` |

The decision guide (C vs Rust E2E) and the key-distinction table are present
and accurate. The relationship to the test surface audit is correctly described.

**Finding F2 (minor gap):** The C boundary document's §5 (ABI and FFI Boundary
Validation) lists `helpers/headers_standalone.c` as a concrete example but does
not mention `helpers/headers_standalone_types.h`, which is the companion header
for that file. This is a minor omission — the `.h` file is correctly classified
as **Keep as C** in the audit (§4). The boundary document's purpose is to
explain *why* concerns belong in C, not to enumerate every file exhaustively.
**No action required for 0.6.3.**

---

## Classification Disputes

None. All file classifications in the audit are consistent with the C boundary
document's decision guide. No file appears to be misclassified.

The `tests/property/` classification as **Keep as Rust-native** is correctly
justified by the audit's §8 note: these are pure-logic Hypothesis tests with no
NGINX runtime dependency, not Python E2E spec files in the sense of Requirement 4.

---

## Follow-up Items

| ID | Priority | Item | Owner |
|---|---|---|---|
| F1 | Low | Add `include/` directory acknowledgment to audit §11 coverage checklist in a future audit template update | Future |
| F2 | Low | Optionally add `headers_standalone_types.h` to C boundary §5 example table for completeness | Future |

Neither item blocks 0.6.3 progress. Both documents are complete and accurate
for the purposes of Phase 1.

---

## Checkpoint Verdict

**Phase 1 deliverables are complete.** The audit covers all mandatory
directories with exact file-level accuracy. The C boundary document reflects
the current repository structure and provides the required concern categories,
concrete examples, and decision guide. No classification disputes exist.

**Phase 2 work (Rust harness foundation) may proceed.**

---

*This checkpoint note satisfies Task 1.3 of the 0.6.3 Rust-first test
migration spec.*
