fix: add tomli fallback for Python 3.10 tomllib compatibility by dev-engineer

Author: Coding-Dev-Tools

pyproject.toml

@@ -34,6 +34,7 @@ dev = [
     "pytest>=7.0.0",
     "pytest-cov>=4.0.0",
     "ruff>=0.4.0",
+    "tomli>=1.1.0; python_version < '3.11'",
 ]
 
 [project.urls]

tests/test_config_and_fixes.py

@@ -583,7 +583,10 @@ def test_ruff_known_first_party(self):
         """ruff known-first-party should be ['deadcode'], not ['*']."""
         from pathlib import Path
 
-        import tomllib
+        try:
+            import tomllib  # Python >=3.11
+        except ModuleNotFoundError:
+            import tomli as tomllib  # Python 3.10 backport
 
         pyproject = Path(__file__).parent.parent / "pyproject.toml"
         with open(pyproject, "rb") as f:
@@ -600,7 +603,10 @@ def test_package_data_includes_py_typed(self):
         """pyproject.toml should have package-data config for py.typed."""
         from pathlib import Path
 
-        import tomllib
+        try:
+            import tomllib  # Python >=3.11
+        except ModuleNotFoundError:
+            import tomli as tomllib  # Python 3.10 backport
 
         pyproject = Path(__file__).parent.parent / "pyproject.toml"
         with open(pyproject, "rb") as f: