Add CI workflow

.github/workflows/ci.yml

@@ -0,0 +1,28 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  lint-test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-python@v4
+        with:
+          python-version: '3.12'
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r requirements-dev.txt
+      - name: Run black
+        run: black --check .
+      - name: Run ruff
+        run: ruff check .
+      - name: Run mypy
+        run: mypy --strict src.py
+      - name: Run tests
+        run: pytest --cov --cov-report=term-missing test.py

src.py

@@ -13,10 +13,20 @@
 import sys
 import warnings
 from contextlib import contextmanager
-from functools import update_wrapper, wraps
+from functools import update_wrapper
 from importlib.metadata import PackageNotFoundError
 from importlib.metadata import version as _get_version
-from typing import Any, Callable, Dict, Generator, Optional, SupportsInt, Tuple, Union
+from typing import (
+    Any,
+    Callable,
+    Dict,
+    Generator,
+    Optional,
+    SupportsInt,
+    Tuple,
+    Union,
+    cast,
+)
 
 
 __all__ = ["versiondispatch"]
@@ -198,7 +208,7 @@ def __init__(self, func: AnyFunc) -> None:
 
         # this looks kinda strange but makes it so that the docstring of the
         # original function is conserved
-        self = wraps(self._impl)(self)
+        update_wrapper(cast(Callable[..., Any], self), self._impl)
 
     def _matches_all_versions(
         self, package_versions: list[tuple[str, str, BinOp]]