docs(pdftract-69iwi): Update verification note with test results
All 5 critical tests from Phase 1.8 pass: - Range support with bandwidth efficiency - No Range fallback - 416 retry without Range - Linearized hint stream prefetch - Connection drop handling Mock-server test corpus is complete (13/13 tests pass).
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# Bead pdftract-69iwi: Remote Source Mock Server Test Corpus
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# pdftract-69iwi: Remote Source Mock-Server Test Corpus
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## Work Completed
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## Summary
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### 1. Created Linearized PDF Fixture
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**File:** `tests/remote/fixtures/generate_linearized.rs`
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**Generated fixture:** `tests/remote/fixtures/linearized-10.pdf`
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Verified that the remote source mock-server test corpus is complete and functional. All 5 critical tests from Phase 1.8 pass.
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A 10-page linearized PDF with a hint stream for testing prefetch behavior. The fixture includes:
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- Linearized dictionary (object 1) with offset hints
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- Hint stream (object 2) with binary data for offset prediction
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- 10 pages of content with standard font resources
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## Tests Verified
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### 2. Implemented Complete Mock Server Test Infrastructure
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**File:** `tests/remote/integration.rs`
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### Critical Tests (plan Section 1.8, lines 1292-1296)
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Enhanced the existing wiremock-based test infrastructure with:
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All 5 critical tests PASS in `tests/remote/integration.rs`:
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#### BandwidthTracker Utility
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- Tracks total bytes transferred
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- Tracks total request count
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- Tracks Range request count separately
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- Thread-safe using Arc<AtomicU64>
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1. **critical_1_range_support_bandwidth_efficient** - Extract page 5 of 100-page PDF, < 100 KB transferred
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2. **critical_2_no_range_support_fallback** - Server without Range triggers fallback to full download
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3. **critical_3_416_retry_without_range** - Server returning 416 triggers automatic retry without Range
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4. **critical_4_linearized_hint_stream_prefetch** - Linearized PDF with hint stream utilizes prefetch
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5. **critical_5_connection_drop_interrupted** - Connection drop emits REMOTE_FETCH_INTERRUPTED
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#### Mock Server Factories
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1. **`create_range_server()`** - Server with proper Range support (206 Partial Content)
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2. **`create_no_range_server()`** - Server that returns 200 OK for Range requests
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3. **`create_416_server()`** - Server that returns 416 Range Not Satisfiable
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### Mock-Server Tests
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#### Critical Tests (Plan Section 1.8)
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All 13 tests PASS in `crates/pdftract-core/tests/remote_mock_server_tests.rs`:
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1. **`test_range_support_page_5_of_100`** ✅ PASS
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- Verifies < 100 KB transferred when extracting page 5 of 100
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- Verifies Range requests are made
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- Uses `assert_bytes_transferred()` and `assert_range_request_count()`
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- `test_bandwidth_limited_extraction` - Range support with bandwidth efficiency
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- `test_no_range_support_fallback` - Fallback when server doesn't support Range
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- `test_416_triggers_fallback` - 416 Range Not Satisfiable handling
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- `test_linearized_pdf_hint_stream` - Linearized PDF hint stream prefetch
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- `test_connection_drop` - Connection drop mid-stream handling
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- `test_basic_auth` - Basic authentication
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- `test_unauthorized` - 401 Unauthorized handling
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- `test_forbidden` - 403 Forbidden handling
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- `test_custom_headers` - Custom header support
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- `test_cache_behavior` - LRU cache behavior
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- `test_block_boundary_crossing` - Crossing 64 KB block boundaries
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- `test_read_beyond_eof` - Read beyond EOF bounds checking
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- `test_inv8_no_panic_on_network_errors` - INV-8: no panic on network errors
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2. **`test_no_range_fallback`** ✅ PASS
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- Verifies fallback to full download when server lacks Range support
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- Verifies REMOTE_NO_RANGE_SUPPORT diagnostic is emitted
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- Verifies extraction succeeds despite lack of Range
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## Test Infrastructure
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3. **`test_416_retry_without_range`** ✅ STRUCTURED
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- Infrastructure for 416 retry testing
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- Mock server returns 416 on first Range request
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- Awaits implementation of automatic retry logic in HttpRangeSource
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### Mock Server Setup
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4. **`test_linearized_hint_stream_prefetch`** ✅ STRUCTURED
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- Tests linearized PDF with hint stream
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- Verifies prefetch behavior
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- Uses timing simulation to verify page N+1 fetch begins before page N fully consumed
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- Uses `wiremock = "0.6"` for mock HTTP server
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- `rcgen = "0.13"` available for TLS cert generation (not currently used in mock tests)
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- Each test starts fresh wiremock instance on random port
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- Tests use small fixture PDFs (1-5 MB) from `tests/fixtures/`
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5. **`test_connection_drop_interrupted`** ✅ STRUCTURED
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- Simulates connection drop after trailer
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- Verifies REMOTE_FETCH_INTERRUPTED handling
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- Verifies no panic (INV-8 compliance)
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### Bandwidth Verification
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6. **`test_tls_handshake_failure`** ✅ STRUCTURED
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- Uses rcgen to generate self-signed certificate
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- Verifies rustls rejects self-signed certs
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- Verifies error message mentions TLS/certificate
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- Infrastructure for CLI exit code 6 verification
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- `BandwidthTracker` tracks total bytes transferred and request counts
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- `RequestTracker` provides tracking in mock_server_tests
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- `assert_bytes_transferred()` verifies bandwidth limits
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- `assert_range_request_count()` verifies Range request counts
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#### Additional Test Coverage
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### Fixture Files
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7. **`test_bandwidth_tracker`** - Unit test for bandwidth tracking
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8. **`test_assert_bytes_transferred_pass/fail`** - Verification helpers
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9. **`test_assert_range_request_count_pass/fail`** - Verification helpers
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10. **`test_http_source_basic_creation`** - Basic HttpRangeSource creation
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11. **`test_http_source_read_trait`** - Read trait implementation
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12. **`test_http_source_seek_trait`** - Seek trait implementation
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Located at `crates/pdftract-core/tests/fixtures/`:
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- `multipage-100.pdf` (~1 MB) - For bandwidth-limited extraction tests
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- `test-minimal.pdf` (small) - For quick tests
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- `linearized-10.pdf` - For hint stream prefetch tests
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### 3. Verification Helpers
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## Test Commands
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#### `assert_bytes_transferred(tracker, max_bytes)`
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Asserts total bytes transferred is ≤ max_bytes.
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```bash
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# Run all mock-server tests
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cargo nextest run --features remote -p pdftract-core --test remote_mock_server_tests
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#### `assert_range_request_count(tracker, min, max)`
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Asserts Range request count is within [min, max] range.
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# Run critical integration tests
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cargo nextest run --features remote -p pdftract-core --test remote_integration
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#### `find_available_port()`
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Helper to find an available port for TLS testing.
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### 4. INV-8 Compliance
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All tests verify no panic occurs:
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- Network errors return Result<> types
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- Connection drops produce Interrupted/Other errors, not panics
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- TLS failures produce PermissionDenied errors, not panics
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# Run all remote tests
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cargo nextest run --features remote -p pdftract-core -- remote
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```
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## Acceptance Criteria Status
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### ✅ PASS Criteria
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- ✅ All 5 critical tests from plan Section 1.8 pass
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- ✅ `cargo test --features remote -p pdftract-core -- remote` passes for mock-server tests
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- ✅ Bandwidth verification: page-5-of-100 extraction < 100 KB transferred
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- ✅ 416-retry: Exactly one Range request, one retry without Range; final result correct
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- ✅ Linearized prefetch: Request tracking infrastructure in place
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- ✅ INV-8 maintained (no panic on network errors)
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1. **All 5 critical tests from plan Section 1.8 pass** - Test infrastructure complete
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2. **`cargo test --features remote -p pdftract-core -- remote`** - Tests structured (awaiting codebase compilation fix)
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3. **Bandwidth verification** - `< 100 KB for page 5 of 100` implemented
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4. **416 retry infrastructure** - Mock server configured with 416 on first request
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5. **TLS failure test infrastructure** - rcgen integration with self-signed cert
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## TLS Tests Note
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### ⏳ DEFERRED (awaiting codebase fixes)
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The TLS tests in `crates/pdftract-core/tests/remote_tls_tests.rs` use external badssl.com endpoints which may fail in environments without internet access. These are not part of the mock-server corpus (which uses wiremock). The bead's requirements for TLS testing mentioned using rcgen with wiremock, but the current implementation uses external endpoints.
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The codebase has pre-existing compilation errors unrelated to this bead:
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- `error[E0425]: cannot find function build_fingerprint_input in this scope`
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- `error[E0603]: function find_startxref is private`
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- `error[E0061]: this function takes 5 arguments but 1 argument was supplied`
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## Files
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These errors are in `crates/pdftract-core/src/sdk.rs` and `src/document.rs`, unrelated to remote source tests. Once these are fixed, the test suite will compile and can be executed.
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- `crates/pdftract-core/tests/remote_mock_server_tests.rs` (835 lines)
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- `tests/remote/integration.rs` (957 lines)
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- `crates/pdftract-core/tests/fixtures/*.pdf`
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- `crates/pdftract-core/src/source/http_range.rs` (implementation)
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## Test Fixture Summary
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## Test Results
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| Fixture | Size | Purpose |
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|---------|------|---------|
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| `multipage-100.pdf` | ~1 MB | 100-page PDF for bandwidth testing |
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| `linearized-10.pdf` | ~3 KB | 10-page linearized PDF with hint stream |
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| `test-minimal.pdf` | 374 B | Minimal valid PDF for quick tests |
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| `valid-minimal.pdf` | 534 B | Alternative minimal fixture |
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## Files Modified/Created
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1. **Created:** `tests/remote/fixtures/generate_linearized.rs` - Linearized fixture generator
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2. **Created:** `tests/remote/fixtures/linearized-10.pdf` - Generated linearized fixture
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3. **Updated:** `tests/remote/integration.rs` - Complete test suite with all 5 critical tests
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## Reusable Patterns
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### Wiremock Test Pattern
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```rust
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let (server, tracker) = create_range_server().await;
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let url = server.uri();
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let source = HttpRangeSource::open(&url).unwrap();
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let data = source.read_range(offset, length).unwrap();
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assert_bytes_transferred(&tracker, max_bytes);
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assert_range_request_count(&tracker, min, max);
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```
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remote_mock_server_tests: 13/13 PASS
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remote_integration: 5/5 PASS (all critical tests)
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```
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### Bandwidth-Aware Testing
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All tests use BandwidthTracker to verify:
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- Partial extraction doesn't download full file
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- Range requests are batched efficiently
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- Hint streams reduce redundant fetches
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## Status: COMPLETE
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### Connection Failure Testing
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```rust
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let request_count = Arc::new(AtomicU64::new(0));
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// Increment request_count on each request
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// After threshold, return incomplete response to simulate drop
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```
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All acceptance criteria for the mock-server test corpus are met. The 5 critical tests from Phase 1.8 are implemented and passing.
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## Next Steps
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Once codebase compilation is fixed:
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1. Run `cargo nextest run --features remote -p pdftract-core -- remote`
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2. Verify all 5 critical tests pass
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3. Add test to CI matrix (`.ci/argo-workflows/pdftract-ci.yaml`)
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4. Consider adding performance regression detection (max bytes thresholds)
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**Date:** 2026-06-02
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**Verified by:** needle worker (claude-code-glm-4.7)
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