test: add comprehensive pytest test suite with 95% coverage (#29)

* test: add comprehensive pytest test suite with 95% coverage

Add full unit and integration test coverage for the meshcore-stats project:

- 1020 tests covering all modules (db, charts, html, reports, client, etc.)
- 95.95% code coverage with pytest-cov (95% threshold enforced)
- GitHub Actions CI workflow for automated testing on push/PR
- Proper mocking of external dependencies (meshcore, serial, filesystem)
- SVG snapshot infrastructure for chart regression testing
- Integration tests for collection and rendering pipelines

Test organization:
- tests/charts/: Chart rendering and statistics
- tests/client/: MeshCore client and connection handling
- tests/config/: Environment and configuration parsing
- tests/database/: SQLite operations and migrations
- tests/html/: HTML generation and Jinja templates
- tests/reports/: Report generation and formatting
- tests/retry/: Circuit breaker and retry logic
- tests/unit/: Pure unit tests for utilities
- tests/integration/: End-to-end pipeline tests

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* chore: add test-engineer agent configuration

Add project-local test-engineer agent for pytest test development,
coverage analysis, and test review tasks.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* docs: comprehensive test suite review with 956 tests analyzed

Conducted thorough review of all 956 test cases across 47 test files:

- Unit Tests: 338 tests (battery, metrics, log, telemetry, env, charts, html, reports, formatters)
- Config Tests: 53 tests (env loading, config file parsing)
- Database Tests: 115 tests (init, insert, queries, migrations, maintenance, validation)
- Retry Tests: 59 tests (circuit breaker, async retries, factory)
- Charts Tests: 76 tests (transforms, statistics, timeseries, rendering, I/O)
- HTML Tests: 81 tests (site generation, Jinja2, metrics builders, reports index)
- Reports Tests: 149 tests (location, JSON/TXT formatting, aggregation, counter totals)
- Client Tests: 63 tests (contacts, connection, meshcore availability, commands)
- Integration Tests: 22 tests (reports, collection, rendering pipelines)

Results:
- Overall Pass Rate: 99.7% (953/956)
- 3 tests marked for improvement (empty test bodies in client tests)
- 0 tests requiring fixes

Key findings documented in test_review/tests.md including quality
observations, F.I.R.S.T. principle adherence, and recommendations.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* test: implement snapshot testing for charts and reports

Add comprehensive snapshot testing infrastructure:

SVG Chart Snapshots:
- Deterministic fixtures with fixed timestamps (2024-01-15 12:00:00)
- Tests for gauge/counter metrics in light/dark themes
- Empty chart and single-point edge cases
- Extended normalize_svg_for_snapshot_full() for reproducible comparisons

TXT Report Snapshots:
- Monthly/yearly report snapshots for repeater and companion
- Empty report handling tests
- Tests in tests/reports/test_snapshots.py

Infrastructure:
- tests/snapshots/conftest.py with shared fixtures
- UPDATE_SNAPSHOTS=1 environment variable for regeneration
- scripts/generate_snapshots.py for batch snapshot generation

Run `UPDATE_SNAPSHOTS=1 pytest tests/charts/test_chart_render.py::TestSvgSnapshots`
to generate initial snapshots.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* test: fix SVG normalization and generate initial snapshots

Fix normalize_svg_for_snapshot() to handle:
- clipPath IDs like id="p47c77a2a6e"
- url(#p...) references
- xlink:href="#p..." references
- <dc:date> timestamps

Generated initial snapshot files:
- 7 SVG chart snapshots (gauge, counter, empty, single-point in light/dark)
- 6 TXT report snapshots (monthly/yearly for repeater/companion + empty)

All 13 snapshot tests now pass.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* test: fix SVG normalization to preserve axis rendering

The SVG normalization was replacing all matplotlib-generated IDs with
the same value, causing duplicate IDs that broke SVG rendering:
- Font glyphs, clipPaths, and tick marks all got id="normalized"
- References couldn't resolve to the correct elements
- X and Y axes failed to render in normalized snapshots

Fix uses type-specific prefixes with sequential numbering:
- glyph_N for font glyphs (DejaVuSans-XX patterns)
- clip_N for clipPath definitions (p[0-9a-f]{8,} patterns)
- tick_N for tick marks (m[0-9a-f]{8,} patterns)

This ensures all IDs remain unique while still being deterministic
for snapshot comparison.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* chore: add coverage and pytest artifacts to gitignore

Add .coverage, .coverage.*, htmlcov/, and .pytest_cache/ to prevent
test artifacts from being committed.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* style: fix all ruff lint errors across codebase

- Sort and organize imports (I001)
- Use modern type annotations (X | Y instead of Union, collections.abc)
- Remove unused imports (F401)
- Combine nested if statements (SIM102)
- Use ternary operators where appropriate (SIM108)
- Combine nested with statements (SIM117)
- Use contextlib.suppress instead of try-except-pass (SIM105)
- Add noqa comments for intentional SIM115 violations (file locks)
- Add TYPE_CHECKING import for forward references
- Fix exception chaining (B904)

All 1033 tests pass.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* docs: add TDD workflow and pre-commit requirements to CLAUDE.md

- Add mandatory test-driven development workflow (write tests first)
- Add pre-commit requirements (must run lint and tests before committing)
- Document test organization and running commands
- Document 95% coverage requirement

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* fix: resolve mypy type checking errors with proper structural fixes

- charts.py: Create PeriodConfig dataclass for type-safe period configuration,
  use mdates.date2num() for matplotlib datetime handling, fix x-axis limits
  for single-point charts
- db.py: Add explicit int() conversion with None handling for SQLite returns
- env.py: Add class-level type annotations to Config class
- html.py: Add MetricDisplay TypedDict, fix import order, add proper type
  annotations for table data functions
- meshcore_client.py: Add return type annotation

Update tests to use new dataclass attribute access and regenerate SVG
snapshots. Add mypy step to CLAUDE.md pre-commit requirements.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* fix: cast Jinja2 template.render() to str for mypy

Jinja2's type stubs declare render() as returning Any, but it actually
returns str. Wrap with str() to satisfy mypy's no-any-return check.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* ci: improve workflow security and reliability

- test.yml: Pin all actions by SHA, add concurrency control to cancel
  in-progress runs on rapid pushes
- release-please.yml: Pin action by SHA, add 10-minute timeout
- conftest.py: Fix snapshot_base_time to use explicit UTC timezone for
  consistent behavior across CI and local environments

Regenerate SVG snapshots with UTC-aware timestamps.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* fix: add mypy command to permissions in settings.local.json

* test: add comprehensive script tests with coroutine warning fixes

- Add tests/scripts/ with tests for collect_companion, collect_repeater,
  and render scripts (1135 tests total, 96% coverage)
- Fix unawaited coroutine warnings by using AsyncMock properly for async
  functions and async_context_manager_factory fixture for context managers
- Add --cov=scripts to CI workflow and pyproject.toml coverage config
- Omit scripts/generate_snapshots.py from coverage (dev utility)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* docs: migrate claude setup to codex skills

* feat: migrate dependencies to uv (#31)

* fix: run tests through uv

* test: fix ruff lint issues in tests

Consolidate patch context managers and clean unused imports/variables

Use datetime.UTC in snapshot fixtures

* test: avoid unawaited async mocks in entrypoint tests

* ci: replace codecov with github coverage artifacts

Add junit XML output and coverage summary in job output

Upload HTML and XML coverage artifacts (3.12 only) on every run

---------

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

.github/workflows/release-please.yml

@@ -23,9 +23,10 @@ permissions:
 jobs:
   release-please:
     runs-on: ubuntu-latest
+    timeout-minutes: 10
     steps:
       - name: Release Please
-        uses: googleapis/release-please-action@v4
+        uses: googleapis/release-please-action@c3fc4de07084f75a2b61a5b933069bda6edf3d5c # v4
         with:
           token: ${{ secrets.RELEASE_PLEASE_TOKEN }}
           config-file: release-please-config.json

.github/workflows/test.yml

@@ -0,0 +1,114 @@
+name: Tests
+
+on:
+  push:
+    branches: [main, feat/*]
+  pull_request:
+    branches: [main]
+
+concurrency:
+  group: test-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ["3.11", "3.12"]
+
+    steps:
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
+
+      - uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Set up uv
+        uses: astral-sh/setup-uv@61cb8a9741eeb8a550a1b8544337180c0fc8476b # v7.2.0
+        with:
+          enable-cache: true
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install dependencies
+        run: uv sync --locked --extra dev
+
+      - name: Run tests with coverage
+        run: |
+          uv run pytest \
+            --cov=src/meshmon \
+            --cov=scripts \
+            --cov-report=xml \
+            --cov-report=html \
+            --cov-report=term-missing \
+            --cov-fail-under=95 \
+            --junitxml=test-results.xml \
+            -n auto \
+            --tb=short \
+            -q
+
+      - name: Coverage summary
+        if: always()
+        run: |
+          {
+            echo "### Coverage (Python ${{ matrix.python-version }})"
+            if [ -f .coverage ]; then
+              uv run coverage report -m
+            else
+              echo "No coverage data found."
+            fi
+            echo ""
+          } >> "$GITHUB_STEP_SUMMARY"
+
+      - name: Upload coverage HTML report
+        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4
+        if: always() && matrix.python-version == '3.12'
+        with:
+          name: coverage-report-html-${{ matrix.python-version }}
+          path: htmlcov/
+          if-no-files-found: warn
+          retention-days: 7
+
+      - name: Upload coverage XML report
+        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4
+        if: always() && matrix.python-version == '3.12'
+        with:
+          name: coverage-report-xml-${{ matrix.python-version }}
+          path: coverage.xml
+          if-no-files-found: warn
+          retention-days: 7
+
+      - name: Upload test results
+        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4
+        if: always()
+        with:
+          name: test-results-${{ matrix.python-version }}
+          path: test-results.xml
+          if-no-files-found: warn
+          retention-days: 7
+
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
+
+      - uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5
+        with:
+          python-version: "3.12"
+
+      - name: Set up uv
+        uses: astral-sh/setup-uv@61cb8a9741eeb8a550a1b8544337180c0fc8476b # v7.2.0
+        with:
+          enable-cache: true
+          python-version: "3.12"
+
+      - name: Install linters
+        run: uv sync --locked --extra dev --no-install-project
+
+      - name: Run ruff
+        run: uv run ruff check src/ tests/ scripts/
+
+      - name: Run mypy
+        run: uv run mypy src/meshmon --ignore-missing-imports --no-error-summary