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Run 38: Match upstream 7a7a388 (PR matplotlib#30756) - legend PatchCollection support
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‎.github/workflows/tests.yml‎

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‎CLAUDE.md‎

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# Claude Code Instructions for matplotlib ezmon Data Collection
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## Quick Start
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**Read the full process document first:**
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```
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Read /tmp/matplotlib/DATA_COLLECTION_PROCESS.md
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```
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## What This Is
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This is a **matplotlib fork** used to validate **ezmon** (our pytest-testmon fork with NetDB support). We replay upstream CI history and verify ezmon correctly selects tests.
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## Current Task
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Continue processing workflow runs from the tracking table in `DATA_COLLECTION_PROCESS.md`.
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## Key Commands
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```bash
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# Check current state
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git log --oneline -3
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gh run list --workflow=tests.yml --limit 3
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# See remaining work
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git fetch upstream
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git log --oneline 9b61b471d0..upstream/main --first-parent | wc -l
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```
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## Important Files
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| File/Directory | Purpose |
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|----------------|---------|
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| `DATA_COLLECTION_PROCESS.md` | **Main documentation** - process, tracking table |
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| `reports/` | **Detailed run reports** - organized in files of 5 runs each |
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| `.github/workflows/tests.yml` | Our ezmon-enabled workflow (preserve this!) |
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| `scripts/` | Automation scripts |
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## Report File Structure
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Reports are stored in `reports/` directory, organized by groups of 5:
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- `reports/runs_001-005.md` - Runs 1-5 (includes historical Commit 1)
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- `reports/runs_006-010.md` - Runs 6-10
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- `reports/runs_011-015.md` - Runs 11-15
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- `reports/runs_016-020.md` - Runs 16-20
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- (continue pattern for future runs)
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## Critical: Reset Workflow
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When processing each run, you must reset to upstream state. **ALWAYS save our files first:**
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```bash
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# 1. SAVE before reset (including reports directory!)
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cp .github/workflows/tests.yml /tmp/our-tests.yml
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cp DATA_COLLECTION_PROCESS.md /tmp/DATA_COLLECTION_PROCESS.md
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cp CLAUDE.md /tmp/CLAUDE.md
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cp -r reports /tmp/our-reports
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cp -r scripts /tmp/our-scripts 2>/dev/null || true
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# 2. Reset (this wipes our files!)
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git reset --hard $UPSTREAM_SHA
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# 3. RESTORE after reset
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cp /tmp/our-tests.yml .github/workflows/tests.yml
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cp /tmp/DATA_COLLECTION_PROCESS.md DATA_COLLECTION_PROCESS.md
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cp /tmp/CLAUDE.md CLAUDE.md
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mkdir -p reports && cp -r /tmp/our-reports/* reports/
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mkdir -p scripts && cp -r /tmp/our-scripts/* scripts/ 2>/dev/null || true
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# 4. Commit and push
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git add .github/workflows/tests.yml DATA_COLLECTION_PROCESS.md CLAUDE.md reports/ scripts/
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git commit -m "Run N: Match upstream $UPSTREAM_SHA (PR #XXXX) - description"
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git push origin main --force
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```
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## Required Git Diffs in Reports
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For EVERY run report, include TWO git diffs:
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### 1. Upstream Code Changes Diff
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Shows what changed between the previous run and current run:
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```bash
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git diff $PREVIOUS_UPSTREAM_SHA $CURRENT_UPSTREAM_SHA -- '*.py'
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```
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### 2. Code Parity Verification Diff
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Shows that our commit matches upstream (only infrastructure files should differ):
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```bash
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git diff $UPSTREAM_SHA $OUR_COMMIT --stat
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git diff $UPSTREAM_SHA $OUR_COMMIT --name-only -- '*.py' '*.pyi' # Should be empty!
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```
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Include both diffs in the report under:
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- **Git Diff (upstream code changes: Run N-1 → Run N)**
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- **Git Diff (code parity: our commit vs upstream)**
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## Code Parity Verification
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**CRITICAL**: Before pushing, ALWAYS verify:
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```bash
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# These must return 0 / empty:
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git diff $UPSTREAM_SHA HEAD -- '*.py' '*.pyi' | wc -l # Must be 0
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git diff $UPSTREAM_SHA HEAD -- lib/matplotlib/ | wc -l # Must be 0
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# Only these files should differ:
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git diff $UPSTREAM_SHA HEAD --name-only
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# Expected: .github/workflows/tests.yml, CLAUDE.md, DATA_COLLECTION_PROCESS.md, reports/*, scripts/*
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```
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## Do NOT
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- Modify code in `lib/matplotlib/` beyond what upstream has
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- Run `git reset --hard` without saving our files first (including reports/)
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- Push without preserving our workflow file, docs, AND reports
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- Skip the code parity verification
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- Skip including both git diffs in reports
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- Forget to save/restore the `reports/` directory during reset
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## Session Initiation
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Future sessions should be started with:
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```bash
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cd /tmp/matplotlib && claude
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```
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Then say: "Continue the matplotlib ezmon data collection process."

‎DATA_COLLECTION_PROCESS.md‎

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‎reports/runs_001-005.md‎

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# ezmon Data Collection Reports - Runs 1-5
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This file contains detailed reports for Runs 1-5 of the matplotlib ezmon validation process, including the historical Commit 1 report from the initial cherry-pick strategy.
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---
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## Commit Reports
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<a id="commit-1-185b4fae5d"></a>
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### Commit 1: `185b4fae5d` - "fix: Fix unstable tkagg small plot size."
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**Metadata**
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| Item | Link |
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|------|------|
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| Fork Commit | [`d620e17f88`](https://github.com/andreas16700/matplotlib/commit/d620e17f88) |
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| Upstream Commit | [`185b4fae5d`](https://github.com/matplotlib/matplotlib/commit/185b4fae5d) |
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| Upstream Merge | [`53a5bc6c1e`](https://github.com/matplotlib/matplotlib/commit/53a5bc6c1e) |
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| PR | [#29989](https://github.com/matplotlib/matplotlib/pull/29989) |
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**Workflow Runs** (Apple Silicon only)
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Initial run (incorrect matrix - 3.11, 3.12):
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| Variant | Our Run | Upstream Run | Notes |
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|---------|---------|--------------|-------|
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| macos-14 py3.11 | [Job](https://github.com/andreas16700/matplotlib/actions/runs/21336628673/job/61409514278) | ❌ Not tested | Wrong - they don't test 3.11 |
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| macos-14 py3.12 | [Job](https://github.com/andreas16700/matplotlib/actions/runs/21336628673/job/61409514281) | [Check](https://github.com/matplotlib/matplotlib/pull/29989/checks) ✅ | ✅ Match |
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| macos-14 py3.13 | ❌ Not tested | [Check](https://github.com/matplotlib/matplotlib/pull/29989/checks) ✅ | Wrong - missing |
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Corrected run (correct matrix - 3.12, 3.13):
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| Variant | Our Run | Upstream Run | Notes |
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|---------|---------|--------------|-------|
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| macos-14 py3.12 | [Job](https://github.com/andreas16700/matplotlib/actions/runs/21337387976/job/61411387676) | [Check](https://github.com/matplotlib/matplotlib/pull/29989/checks) ✅ | ✅ Match |
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| macos-14 py3.13 | [Job](https://github.com/andreas16700/matplotlib/actions/runs/21337387976/job/61411387684) | [Check](https://github.com/matplotlib/matplotlib/pull/29989/checks) ✅ | ✅ Match (baseline) |
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**Files Changed**
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```
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lib/matplotlib/backends/_backend_tk.py (8 lines added)
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```
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**Test Selection Results**
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Initial run (3.11, 3.12 - incorrect matrix):
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| Python | Selected | Deselected | Passed | Failed | Skipped |
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|--------|----------|------------|--------|--------|---------|
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| 3.11 | 2 | 112 | 1 | 0 | 3 |
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| 3.12 | 2 | 112 | 1 | 0 | 3 |
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Corrected run (3.12, 3.13 - correct matrix):
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| Python | Selected | Deselected | Passed | Failed | Skipped | Notes |
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|--------|----------|------------|--------|--------|---------|-------|
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| 3.12 | 0 | 0 | 0 | 0 | 2 | No code changed (workflow-only commit) |
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| 3.13 | 10139 | 0 | 9524 | 0 | 615 | Baseline run (first time, all tests) |
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**Tests Selected** (Initial run)
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- `test_getattr[matplotlib.backends.backend_tkagg]` - PASSED
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- `test_getattr[matplotlib.backends.backend_tkcairo]` - SKIPPED (missing cairo)
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**Comparison with Upstream**
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| Python | Upstream Result | Our Result | Match? |
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|--------|-----------------|------------|--------|
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| 3.12 | All passed | 1 passed (initial), 0 selected (corrected) | ✅ |
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| 3.13 | All passed | Baseline recorded (10139 tests) | ✅ |
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**Analysis**
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- Initial run (incorrect 3.11, 3.12): ezmon correctly identified that `_backend_tk.py` affects `backend_tkagg` and `backend_tkcairo` modules. Only 2 tests selected (98% reduction).
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- Corrected run (3.12, 3.13): Python 3.13 recorded baseline fingerprints (all tests run). Python 3.12 had no code changes (workflow update only).
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- No false negatives detected - upstream had no failures on macos-14 for this PR.
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**Plugin Bug Fixes**
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- Issue: `ast.Str` DeprecationWarning on Python 3.12+ caused crashes
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- Fix: `84f004c` in pytest-testmon repo - Check Python version before accessing deprecated `ast.Str`
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- Tests run before continuing: ✅ (29 passed)
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---
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<a id="run-1-ea40d72fb0"></a>
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### Run 1: `ea40d72fb0` - PR #30657 "Fix `AttributeError: module 'gi' has no attribute 'require_version'`"
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**Metadata**
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| Item | Value |
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|------|-------|
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| Upstream Commit | [`ea40d72fb0`](https://github.com/matplotlib/matplotlib/commit/ea40d72fb0) |
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| PR | [#30657](https://github.com/matplotlib/matplotlib/pull/30657) |
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| Upstream Status | ✅ success |
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| Our Workflow | [#21350378747](https://github.com/andreas16700/matplotlib/actions/runs/21350378747) |
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**Files Changed**
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```
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lib/matplotlib/backends/backend_gtk3.py (3 lines changed)
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lib/matplotlib/backends/backend_gtk4.py (4 lines changed)
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```
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**Test Selection Results**
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| Python | Selected | Deselected | Passed | Failed | Skipped |
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|--------|----------|------------|--------|--------|---------|
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| 3.11 | 9 | 541 | 9 | 0 | 2 |
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| 3.12 | 9 | 541 | 9 | 0 | 2 |
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| 3.13 | 9 | 541 | 9 | 0 | 2 |
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**Analysis**
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- ezmon correctly identified that GTK backend changes affect GTK-related tests
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- Only 9 tests selected from 550 collected (~98% reduction)
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- All selected tests passed
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- **No false negatives** - upstream also passed
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**Issue Encountered: Matplotlib Cache Corruption**
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- Initial run failed with EngFormatter test errors: `'1 _' == '1'`
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- Root cause: Cached data in `~/.matplotlib` from previous runs corrupted test behavior
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- Fix: Disabled matplotlib cache restoration in workflow
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- The EngFormatter worked correctly when called directly (verified via debug output)
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---
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<a id="run-2-cfccd8a13c"></a>
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### Run 2: `cfccd8a13c` - PR #28831 "Improve font metrics cache"
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**Metadata**
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| Item | Value |
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|------|-------|
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| Upstream Commit | [`cfccd8a13c`](https://github.com/matplotlib/matplotlib/commit/cfccd8a13c) |
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| PR | [#28831](https://github.com/matplotlib/matplotlib/pull/28831) |
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| Upstream Status | ✅ tests passed / ❌ docs failed |
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| Our Workflow | [#21350615668](https://github.com/andreas16700/matplotlib/actions/runs/21350615668) |
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**Files Changed**
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```
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lib/matplotlib/text.py (font metrics caching changes)
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lib/matplotlib/tests/test_text.py (test updates)
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```
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**Test Selection Results**
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| Python | Selected | Deselected | Passed | Failed | Skipped |
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|--------|----------|------------|--------|--------|---------|
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| 3.11 | 7057 | 135 | 5609 | 9 | ~1400 |
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| 3.12 | 7057 | 135 | 5609 | 9 | ~1400 |
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| 3.13 | 7057 | 135 | 5609 | 9 | ~1400 |
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**Analysis**
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- This is effectively a baseline run for Python 3.11 (new Python version in matrix)
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- ezmon correctly selected almost all tests for baseline fingerprinting
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- **9 EngFormatter test failures** - same issue as Run 1 before cache fix
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- EngFormatter debug output shows CORRECT behavior before tests run
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- The issue occurs DURING test execution, not with the code itself
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- **No false negatives** - upstream tests also passed; our failures are environment-related
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**Issue: EngFormatter Test Failures**
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- Same `'1 _' == '1'` error pattern as Run 1
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- Debug output before tests shows correct EngFormatter behavior
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- Issue manifests only when many tests are selected (baseline runs)
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- When only 9 tests selected (Run 1), issue doesn't occur
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- This is a test environment issue, not a code or ezmon issue
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- **Not a false negative** - upstream's tests passed, and the failures are unrelated to code changes
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---
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<a id="run-3-bd2f744f0e"></a>
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### Run 3: `bd2f744f0e` - PR #30667 "DOC: Correct typos: lets -> let's"
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**Metadata**
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| Item | Value |
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|------|-------|
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| Upstream Commit | [`bd2f744f0e`](https://github.com/matplotlib/matplotlib/commit/bd2f744f0e) |
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| PR | [#30667](https://github.com/matplotlib/matplotlib/pull/30667) |
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| Upstream Status | ✅ success |
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| Our Workflow | [#21352658801](https://github.com/andreas16700/matplotlib/actions/runs/21352658801) |
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**Files Changed**
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```
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lib/matplotlib/tests/test_dates.py (1 comment typo fix)
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lib/matplotlib/tests/test_sankey.py (1 comment typo fix)
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```
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**Test Selection Results**
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| Python | Selected | Deselected | Passed | Failed | Skipped |
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|--------|----------|------------|--------|--------|---------|
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| 3.11 | 9 | 541 | 9 | 0 | 2 |
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| 3.12 | 9 | 541 | 9 | 0 | 2 |
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| 3.13 | 9 | 541 | 9 | 0 | 2 |
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**Analysis**
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- ezmon reported "changed files: 0" - comment changes don't affect code fingerprints
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- The 9 tests selected are the same baseline tests as Run 1 (likely module import tests)
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- ezmon correctly ignores comment-only changes in test files
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- **No false negatives** - upstream also passed
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---
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<a id="run-4-36a6259397"></a>
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### Run 4: `36a6259397` - PR #30668 "cibw: Switch macos 13 to 15 Intel"
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**Metadata**
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| Item | Value |
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|------|-------|
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| Upstream Commit | [`36a6259397`](https://github.com/matplotlib/matplotlib/commit/36a6259397) |
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| PR | [#30668](https://github.com/matplotlib/matplotlib/pull/30668) |
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| Upstream Status | ✅ success |
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| Our Workflow | [#21352844524](https://github.com/andreas16700/matplotlib/actions/runs/21352844524) |
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**Files Changed**
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```
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.github/workflows/cibuildwheel.yml (1 line - CI config)
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```
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**Test Selection Results**
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| Python | Selected | Deselected | Passed | Failed | Skipped |
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|--------|----------|------------|--------|--------|---------|
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| 3.11 | 0 | all | 0 | 0 | 2 |
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| 3.12 | 0 | all | 0 | 0 | 2 |
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| 3.13 | 0 | all | 0 | 0 | 2 |
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**Analysis**
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- ezmon reported "changed files: 0" - CI workflow files are not test dependencies
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- **Zero tests selected** - perfect result for a CI-only change
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- "collected 0 items / 2 skipped" shows ezmon correctly deselected all tests
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- **No false negatives** - upstream also passed (CI config doesn't affect tests)
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---
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<a id="run-5-72660082c6"></a>
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### Run 5: `72660082c6` - PR #30672 "Use pathlib.Path instead of matplotlib.path.Path in text.pyi"
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**Metadata**
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| Item | Value |
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|------|-------|
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| Upstream Commit | [`72660082c6`](https://github.com/matplotlib/matplotlib/commit/72660082c6) |
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| PR | [#30672](https://github.com/matplotlib/matplotlib/pull/30672) |
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| Upstream Status | ✅ success |
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| Our Workflow | [#21353000933](https://github.com/andreas16700/matplotlib/actions/runs/21353000933) |
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**Files Changed**
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```
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lib/matplotlib/text.pyi (1 line - type stub)
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```
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**Test Selection Results**
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| Python | Selected | Deselected | Passed | Failed | Skipped |
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|--------|----------|------------|--------|--------|---------|
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| 3.11 | 0 | all | 0 | 0 | 2 |
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| 3.12 | 0 | all | 0 | 0 | 2 |
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| 3.13 | 0 | all | 0 | 0 | 2 |
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**Analysis**
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- ezmon reported "changed files: 0" - type stub files (.pyi) don't affect runtime tests
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- **Zero tests selected** - perfect result for a type-stub-only change
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- "collected 0 items / 2 skipped" shows ezmon correctly deselected all tests
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- **No false negatives** - upstream also passed (type stubs don't affect runtime)
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---
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