docs(bf-n5w42): document test failure root cause analysis
Analyzed test failures from bf-1wczm execution. Found: - No test hangs detected (all modules completed in <1s) - 11 test failures across 2 modules due to fixture issues - encoding_recovery: 5 PDF fixtures corrupted (missing /Root reference, 0 pages) - cjk_encoding: 5 tests failed due to path resolution issues Proposed fix strategy: 1. Regenerate corrupted PDF fixtures in tests/fixtures/encoding/ 2. Fix path resolution using CARGO_MANIFEST_DIR in cjk_encoding.rs 3. Add fixture validation to CI Closes bf-n5w42.
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notes/bf-52v1t.md
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# Research Findings: cargo nextest Timing Output Flags
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**Bead:** bf-52v1t
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**Task:** Research cargo nextest CLI reference and documentation to identify all flags related to per-test timing data output.
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**Date:** 2026-07-07
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## Summary
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Research completed. Identified all timing-related flags in cargo nextest CLI and documentation. Findings are ready for local testing.
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## Identified Timing-Related Flags
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### 1. Build Timing Output
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**Flag:** `--timings[=<FMTS>]`
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**Status:** Unstable
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**Purpose:** Generate build timing reports (NOT per-test timing)
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**Syntax:**
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```bash
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cargo nextest run --timings=html
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cargo nextest run --timings=json
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cargo nextest run --timings=html,json
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```
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**Formats:** `html`, `json` (comma-separated)
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**Scope:** This generates build-time timing reports, not per-test execution timing. It's about compilation duration, not test runtime.
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---
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### 2. Test Status Visibility Flags
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These flags control which test results are displayed, including timing information for slow tests.
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#### 2.1 `--status-level <LEVEL>`
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**Purpose:** Control which test statuses are output during the run
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**Env var:** `NEXTEST_STATUS_LEVEL`
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**Values:**
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- `none` - No status output during run
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- `fail` - Only failed tests
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- `retry` - Retry attempts
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- `slow` - **Slow tests (timing-related)**
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- `leak` - Memory leaks
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- `pass` - Passed tests
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- `all` - All statuses
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**Syntax:**
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```bash
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cargo nextest run --status-level=slow
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cargo nextest run --status-level=all
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```
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**Note:** The `slow` value specifically controls display of tests that exceed the configured `slow-timeout` threshold.
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#### 2.2 `--final-status-level <LEVEL>`
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**Purpose:** Control which test statuses are output at the END of the run
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**Env var:** `NEXTEST_FINAL_STATUS_LEVEL`
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**Values:**
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- `none` - No final status output
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- `fail` - Only failed tests
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- `flaky` - Flaky tests
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- `slow` - **Slow tests (timing-related)**
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- `skip` - Skipped tests
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- `pass` - Passed tests
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- `all` - All statuses
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**Syntax:**
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```bash
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cargo nextest run --final-status-level=slow
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cargo nextest run --final-status-level=all
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```
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---
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### 3. Machine-Readable Output with Timing
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#### 3.1 `--message-format <FORMAT>`
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**Purpose:** Output test results in structured format (includes timing data)
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**Status:** Experimental
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**Env var:** `NEXTEST_MESSAGE_FORMAT`
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**Values:**
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- `human` - Default human-readable format
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- `libtest-json` - **Same format as libtest (includes timing)**
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- `libtest-json-plus` - **libtest format + nextest metadata (includes detailed timing)**
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**Syntax:**
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```bash
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cargo nextest run --message-format=libtest-json
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cargo nextest run --message-format=libtest-json-plus
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```
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**Timing data included:** Both JSON formats include execution time per test.
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#### 3.2 `--message-format-version <VERSION>`
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**Purpose:** Pin structured output format version for stability
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**Status:** Experimental
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**Env var:** `NEXTEST_MESSAGE_FORMAT_VERSION`
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**Syntax:**
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```bash
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cargo nextest run --message-format=libtest-json --message-format-version=1
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```
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**Use case:** Ensures consistent parsing across nextest versions when consuming JSON output programmatically.
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---
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### 4. Slow Test Threshold (Config File)
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**Not a CLI flag, but critical for timing behavior.**
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**Config file:** `.config/nextest.toml` (profile section)
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**Setting:** `slow-timeout`
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**Purpose:** Defines what constitutes a "slow" test
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**Syntax:**
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```toml
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[profile.ci]
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slow-timeout = { period = "60s", terminate-after = 3 }
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```
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**Components:**
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- `period` - Threshold time before a test is marked "slow"
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- `terminate-after` - Multiplier for hard timeout (kills test after period × N)
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**Default behavior:** Tests exceeding `period` are tagged as "slow" and displayed when `--status-level=slow` or `--final-status-level=slow` is set.
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---
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### 5. Additional Reporter Options
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#### 5.1 `--show-progress <SHOW_PROGRESS>`
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**Purpose:** Control progress display (affects timing visibility)
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**Env var:** `NEXTEST_SHOW_PROGRESS`
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**Values:**
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- `auto` - Auto-detect based on TTY
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- `none` - No progress display
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- `bar` - Progress bar with running tests
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- `counter` - Counter per completed test
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- `only` - **Progress bar only, hides successful output (shows slow tests)**
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**Syntax:**
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```bash
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cargo nextest run --show-progress=only
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```
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**Note:** The `only` value is equivalent to `--show-progress=bar --status-level=slow --final-status-level=none`, which surfaces slow timing information.
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#### 5.2 `--max-progress-running <N>`
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**Purpose:** Limit how many running tests display in progress bar
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**Syntax:**
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```bash
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cargo nextest run --max-progress-running=10
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```
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---
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## Complete Flag Reference Table
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| Flag | Purpose | Status | Timing Scope | Example |
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|------|---------|--------|---------------|---------|
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| `--timings[=<FMTS>]` | Build timing reports | Unstable | **Build time**, not test time | `--timings=json` |
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| `--status-level` | Status visibility during run | Stable | **Marks slow tests** | `--status-level=slow` |
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| `--final-status-level` | Status visibility at end | Stable | **Shows slow test summary** | `--final-status-level=slow` |
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| `--message-format` | Structured output | Experimental | **Includes execution time** | `--message-format=libtest-json-plus` |
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| `--message-format-version` | Pin JSON schema version | Experimental | **Stable parsing** | `--message-format-version=1` |
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| `--show-progress` | Progress display mode | Stable | **Surface slow tests** | `--show-progress=only` |
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| `slow-timeout` (config) | Define slow threshold | Stable | **Slow test definition** | `slow-timeout = { period = "60s" }` |
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---
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## Key Findings for Testing Strategy
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1. **For per-test execution timing:** Use `--message-format=libtest-json-plus` to get structured JSON with timing data for each test.
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2. **For slow test detection:** Configure `slow-timeout` in profile, then use `--status-level=slow` or `--final-status-level=slow` to surface tests exceeding the threshold.
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3. **For stable programmatic consumption:** Combine `--message-format=libtest-json-plus` with `--message-format-version=N` to ensure schema stability across runs.
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4. **The `--timings` flag is misleading:** Despite its name, `--timings` generates build compilation timing reports, NOT per-test execution timing. This is a common point of confusion.
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## Next Steps
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These findings are ready for local testing. Recommended test sequence:
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1. Test `--message-format=libtest-json-plus` output structure
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2. Verify `slow-timeout` threshold with `--status-level=slow`
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3. Confirm `--message-format-version` produces stable schema across runs
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4. Validate that `--timings` produces build timing (not test timing)
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---
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**Acceptance Criteria Status:**
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- ✅ **List of candidate timing-related flags compiled** (7 total)
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- ✅ **Flag purpose and syntax documented** (comprehensive table above)
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- ✅ **Findings ready for local testing** (next steps outlined)
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# Test Failure Root Cause Analysis
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**Bead ID:** bf-n5w42
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**Date:** 2026-07-07
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**Parent:** bf-60vlq
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**Dependencies:** bf-1wczm (test execution)
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## Executive Summary
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Test execution from bead bf-1wczm completed **without any hangs or timeouts**. All 4 test modules terminated cleanly in under 1 second each. However, **11 tests failed across 2 modules** due to fixture issues, not test logic problems.
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## Test Modules Summary
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| Module | Status | Pass/Fail | Duration |
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|--------|--------|-----------|----------|
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| `unmapped_glyph_names_config` | ✅ PASS | 4/4 | <1s |
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| `encoding_recovery` | ❌ FAIL | 1/6 | <1s |
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| `cjk_encoding` | ❌ FAIL | 0/5 | <1s |
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| `cmap_unmapped_glyphs` | ✅ PASS | 7/7 | <1s |
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**Total:** 12/22 tests passing (54.5%), **0 hangs detected**
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## Root Cause Analysis
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### Issue 1: encoding_recovery Module - Corrupted PDF Fixtures
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**Affected Tests (5 failures):**
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- `test_agl_only_fixture`
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- `test_fingerprint_match_fixture`
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- `test_shape_match_fixture`
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- `test_no_mapping_fixture`
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- `test_corpus_recovery_rate`
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**Error Patterns:**
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1. **"No /Root reference in trailer"** (3 tests)
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```
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called `Result::unwrap()` on an `Err` value:
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"Failed to open PDF: No /Root reference in trailer"
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```
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- Affects: `agl-only.pdf`, `fingerprint-match.pdf`, `shape-match.pdf`
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- Root cause: PDF trailer is missing the required `/Root` catalog reference
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- PDF structure violation: The trailer must point to the document catalog via `/Root`
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2. **"Page index 0 out of bounds (document has 0 pages)"** (2 tests)
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```
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Failed to extract page: Page index 0 out of bounds (document has 0 pages)
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```
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- Affects: `no-mapping.pdf`
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- Root cause: PDF file has no page tree or empty page count
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- Test attempts to extract page 0 but document reports 0 pages
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**Fixture Files Location:** `/home/coding/pdftract/tests/fixtures/encoding/`
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**Files Requiring Regeneration:**
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- `agl-only.pdf`
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- `fingerprint-match.pdf`
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- `shape-match.pdf`
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- `no-mapping.pdf`
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**Evidence:** Files exist (confirmed via `ls -la`) but are structurally invalid PDFs.
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### Issue 2: cjk_encoding Module - Path Resolution Failure
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**Affected Tests (5 failures):**
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- `test_all_cjk_fixtures_exist`
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- `test_cjk_big5_traditional_chinese`
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- `test_cjk_gb18030_chinese`
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- `test_cjk_shiftjis_japanese`
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- `test_cjk_euckr_korean`
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**Error Pattern:**
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```
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CJK fixture PDF should exist: ../../../tests/fixtures/cjk/cjk-chinese-gb18030.pdf
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Failed to open PDF: Failed to open PDF file
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```
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**Root Cause:** Path resolution failure due to test working directory mismatch
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**Test Code Path:** `../../../tests/fixtures/cjk/cjk-chinese-gb18030.pdf`
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**Actual File Location:** `/home/coding/pdftract/tests/fixtures/cjk/cjk-chinese-gb18030.pdf`
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**Test Working Directory:** `target/debug/deps/` (cargo test default)
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The relative path `../../../tests/fixtures/` resolves from `target/debug/deps/` to `tests/fixtures/` in the parent directory, but cargo tests run with the workspace root as cwd in some configurations and target/deps in others. This creates intermittent path resolution failures.
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**Files Confirmed to Exist:**
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- `cjk-chinese-gb18030.pdf` ✅ (822 bytes)
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- `cjk-japanese-shiftjis.pdf` ✅ (822 bytes)
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- `cjk-korean-euckr.pdf` ✅ (826 bytes)
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- `cjk-tc-big5.pdf` ✅ (814 bytes)
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All files are present and non-zero in size, but cannot be found due to path resolution.
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## No Test Hangs Detected
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Per CLAUDE.md test hygiene requirements, I verified for hangs/timeouts:
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✅ All modules completed in <1 second
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✅ No process leaks detected
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✅ No port conflicts observed
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✅ No frozen `cargo test` processes
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✅ No orphaned `pdftract mcp` server processes
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The test execution was clean and rapid. Failures are immediate assertion panics, not hanging timeouts.
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## Proposed Fix Strategy
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### Priority 1: Fix encoding_recovery Fixtures
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1. **Regenerate corrupted PDFs:**
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```bash
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cd /home/coding/pdftract/tests/fixtures/encoding/
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# Re-run fixture generation scripts
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python3 create_unmapped_comprehensive.py
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python3 generate_unmapped_glyphs.py
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```
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2. **Validate regenerated PDFs:**
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```bash
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# Verify /Root reference exists
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pdfgrep -a "Root" agl-only.pdf
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# Verify page count > 0
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pdfinfo agl-only.pdf | grep "Pages:"
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```
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3. **Test after regeneration:**
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```bash
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cargo test -p pdftract-core --test encoding_recovery -- --test-threads=1
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```
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### Priority 2: Fix cjk_encoding Path Resolution
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**Option A: Use CARGO_MANIFEST_DIR (Recommended)**
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```rust
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// In cjk_encoding.rs
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fn get_fixtures() -> Vec<CjkFixture> {
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let manifest_dir = env!("CARGO_MANIFEST_DIR");
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let fixture_base = format!("{}/tests/fixtures/cjk", manifest_dir);
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vec![
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CjkFixture {
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name: "chinese-gb18030",
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pdf_path: &format!("{}/cjk-chinese-gb18030.pdf", fixture_base),
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// ...
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},
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]
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}
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```
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**Option B: Use find-crate crate for dynamic path resolution**
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```rust
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use find_crate::{Find, Source};
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fn get_fixture_path(fixture_name: &str) -> String {
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let pkg = Find::current().expect("find package");
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let source = pkg.source;
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format!("{}/tests/fixtures/cjk/{}", source, fixture_name)
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}
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```
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**Option C: Use std::path absolute resolution**
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```rust
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fn get_fixtures() -> Vec<CjkFixture> {
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let base = Path::new(env!("CARGO_MANIFEST_DIR"))
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.join("tests/fixtures/cjk");
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vec![
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CjkFixture {
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name: "chinese-gb18030",
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pdf_path: base.join("cjk-chinese-gb18030.pdf").to_str().unwrap(),
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// ...
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},
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]
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}
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```
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### Priority 3: Verify Unmapped Glyph Tests
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The `cmap_unmapped_glyphs` and `unmapped_glyph_names_config` modules pass cleanly. No action needed.
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## Test Hygiene Verification
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Per CLAUDE.md test hygiene section, I checked for known failure modes:
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- ✅ **Process leaks:** None detected (all processes terminated cleanly)
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- ✅ **Port conflicts:** N/A (tests don't bind ports)
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- ✅ **Timeout issues:** None (all tests finished instantly)
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- ✅ **Orphaned processes:** None (no subprocess spawning in test code)
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- ✅ **Undrained pipes:** N/A (no server subprocess spawning)
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The test failures are purely fixture/path issues, not the hanging/timeout patterns warned about in CLAUDE.md.
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## Recommendations for Parent Bead (bf-60vlq)
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1. **Add fixture validation to CI:**
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- Run `pdfinfo` on all PDF fixtures before test execution
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- Fail fast if fixtures are corrupted
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2. **Add path resolution tests:**
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- Unit test to verify fixture files are discoverable at test initialization
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- Panic early with clear error message if paths fail
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3. **Document fixture generation:**
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- Add README.md in `tests/fixtures/` explaining how to regenerate fixtures
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- Include validation commands
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4. **Consider cargo-nextest for hung test detection:**
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- Migrate test execution from `cargo test` to `cargo nextest run`
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- Leverage `slow-timeout` configuration for automatic hung test termination
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- Add `.config/nextest.toml` with per-test timeout settings
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## Conclusion
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**No test hangs occurred.** All test modules executed rapidly and terminated cleanly. The 11 test failures are due to:
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- 5 corrupted PDF fixtures (encoding_recovery)
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- 5 path resolution failures (cjk_encoding)
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Both issues are fixable with fixture regeneration and path resolution code changes. The underlying test logic for unmapped glyph assertions is working correctly (11/11 tests passing in the 2 passing modules).
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