ci: add GitHub Actions workflow (pytest matrix + pre-commit)

- pre-commit job runs ruff and the standard hygiene hooks.
- test job matrices Python 3.10-3.13 × Django 4.2/5.0/5.1/5.2,
  excluding combos Django doesn't support (3.13 × 4.2, 3.13 × 5.0).
  Tests use testcontainers — runners ship Docker so no service
  container declaration is needed.
- README gets a CI badge.
- pyproject classifies Django 4.2 (matches the >=4.2 dep and the
  matrix); the missing classifier was an oversight.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: mpasternak

.github/workflows/tests.yml

@@ -0,0 +1,52 @@
+name: tests
+
+on:
+  push:
+    branches: [main, master]
+  pull_request:
+
+permissions:
+  contents: read
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  pre-commit:
+    name: pre-commit
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+      - uses: pre-commit/action@v3.0.1
+
+  test:
+    name: py${{ matrix.python-version }} / django ${{ matrix.django }}
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ["3.10", "3.11", "3.12", "3.13"]
+        django: ["4.2", "5.0", "5.1", "5.2"]
+        exclude:
+          - python-version: "3.13"
+            django: "4.2"
+          - python-version: "3.13"
+            django: "5.0"
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up uv
+        uses: astral-sh/setup-uv@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Install package and test deps
+        run: |
+          uv pip install --system -e ".[test]"
+          uv pip install --system "Django~=${{ matrix.django }}.0"
+      - name: Show resolved versions
+        run: uv pip list --system
+      - name: Run pytest
+        run: pytest -v

README.md

@@ -1,5 +1,6 @@
 # django-formdefaults
 
+[![tests](https://github.com/iplweb/django-formdefaults/actions/workflows/tests.yml/badge.svg)](https://github.com/iplweb/django-formdefaults/actions/workflows/tests.yml)
 [![PyPI version](https://img.shields.io/pypi/v/django-formdefaults.svg)](https://pypi.org/project/django-formdefaults/)
 [![Python versions](https://img.shields.io/pypi/pyversions/django-formdefaults.svg)](https://pypi.org/project/django-formdefaults/)
 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](LICENSE)

pyproject.toml

@@ -24,6 +24,7 @@ classifiers = [
     "Development Status :: 4 - Beta",
     "Environment :: Web Environment",
     "Framework :: Django",
+    "Framework :: Django :: 4.2",
     "Framework :: Django :: 5.0",
     "Framework :: Django :: 5.1",
     "Framework :: Django :: 5.2",