Add test coverage reporting and pre-commit hooks (#2)

* Add test coverage reporting and pre-commit hooks

- Add pytest-cov to test dependencies, configure coverage in pyproject.toml
  (branch coverage, static asset omission, standard exclusion patterns)
- CI test job now runs with --cov and uploads coverage XML as artifact
- Add .pre-commit-config.yaml with ruff (check + format) and mypy hooks

Baseline coverage: 41% (482 tests, Python 3.13)

* Fix Copilot review: add redis dep for pre-commit mypy, explicit --cov target

- Add redis>=7.2 to mypy pre-commit hook additional_dependencies so
  mypy can resolve redis imports in isolated pre-commit environments
- Use --cov=turnstone instead of bare --cov to explicitly scope coverage

.github/workflows/ci.yml

@@ -40,4 +40,9 @@ jobs:
         with:
           python-version: ${{ matrix.python-version }}
       - run: pip install -e ".[test,mq]"
-      - run: pytest tests/ -m "not live" -q
+      - run: pytest tests/ -m "not live" --cov=turnstone --cov-report=term-missing --cov-report=xml -q
+      - uses: actions/upload-artifact@v4
+        if: always()
+        with:
+          name: coverage-${{ matrix.python-version }}
+          path: coverage.xml

.pre-commit-config.yaml

@@ -0,0 +1,16 @@
+repos:
+  - repo: https://github.com/astral-sh/ruff-pre-commit
+    rev: v0.9.10
+    hooks:
+      - id: ruff
+        args: [--fix]
+      - id: ruff-format
+
+  - repo: https://github.com/pre-commit/mirrors-mypy
+    rev: v1.14.1
+    hooks:
+      - id: mypy
+        additional_dependencies: [types-redis>=4.6, redis>=7.2]
+        args: [--config-file=pyproject.toml]
+        pass_filenames: false
+        entry: mypy turnstone/

pyproject.toml

@@ -29,7 +29,7 @@ Repository = "https://github.com/turnstonelabs/turnstone"
 Issues = "https://github.com/turnstonelabs/turnstone/issues"
 
 [project.optional-dependencies]
-test = ["pytest>=9.0"]
+test = ["pytest>=9.0", "pytest-cov>=6.0"]
 dev = ["ruff>=0.9", "mypy>=1.14", "types-redis>=4.6"]
 mq = ["redis>=7.2"]
 console = ["redis>=7.2"]
@@ -80,6 +80,21 @@ disallow_incomplete_defs = true
 check_untyped_defs = true
 no_implicit_optional = true
 
+[tool.coverage.run]
+source = ["turnstone"]
+branch = true
+omit = ["turnstone/*/static/*"]
+
+[tool.coverage.report]
+show_missing = true
+skip_empty = true
+exclude_lines = [
+    "pragma: no cover",
+    "if TYPE_CHECKING",
+    "raise NotImplementedError",
+    'if __name__ == "__main__"',
+]
+
 [[tool.mypy.overrides]]
 module = ["sympy", "sympy.*", "numpy", "numpy.*"]
 ignore_missing_imports = true