chore: add pytest config, deps

pyproject.toml

@@ -58,4 +58,16 @@ dev = [
     "mypy>=1.18.2",
     "pytest>=8.4.2",
     "pytest-cov>=7.0.0",
+    "ratelimit>=2.2.0",
+    "beautifulsoup4>=4.12.0",
 ]
+
+[tool.pytest.ini_options]
+testpaths = ["tests"]
+python_files = ["test_*.py"]
+python_classes = ["Test*"]
+python_functions = ["test_*"]
+markers = [
+    "integration: marks tests as integration tests (deselect with '-m \"not integration\"')",
+]
+