pytest: add custom marker in pyproject.toml instead of conftest.py

pyproject.toml

@@ -68,7 +68,14 @@ source_dirs = ["src/"]
 
 # custom marks are created in conftest.py
 [tool.pytest]
-python_files = ["*_test.py", "test_*.py", "tests.py"]
+markers = ["final"]
+python_files = ["test_*.py", "tests.py"]
+required_plugins = [
+  "pytest-asyncio",
+  "pytest-cov",
+  "pytest-randomly",
+  "pytest-textual-snapshot",
+]
 strict_config = true
 strict_markers = true
 strict_parametrization_ids = false

testing/conftest.py

@@ -1,11 +0,0 @@
-from pytest import Config
-
-
-def pytest_configure(config: Config):
-    """
-    Registers a new mark 'final' that can be applied to tests.
-
-    I did not want to add these in pyproject.toml.
-    """
-
-    config.addinivalue_line("markers", "final: the final test")