tests: Attempt to fix config/ coverage

* Define `darwin` and `linux` *and* "platform known" pragmas.
* Use per-platform pragmas in `config/__init__.py` selection of implementation.
* Attempt, and fail, to use pragma in `config/darwin.py` to ignore it on
  other platforms.

config/__init__.py

@@ -454,19 +454,19 @@ def get_config(*args, **kwargs) -> AbstractConfig:
     :param kwargs: Args to be passed through to implementation.
     :return: Instance of the implementation.
     """
-    if sys.platform == "darwin":
+    if sys.platform == "darwin":  # pragma: sys-platform-not-darwin
         from .darwin import MacConfig
         return MacConfig(*args, **kwargs)
 
-    elif sys.platform == "win32":
+    elif sys.platform == "win32":  # pragma: sys-platform-not-win32
         from .windows import WinConfig
         return WinConfig(*args, **kwargs)
 
-    elif sys.platform == "linux":
+    elif sys.platform == "linux":  # pragma: sys-platform-not-linux
         from .linux import LinuxConfig
         return LinuxConfig(*args, **kwargs)
 
-    else:
+    else:  # pragma: sys-platform-known
         raise ValueError(f'Unknown platform: {sys.platform=}')
 
 

config/darwin.py

@@ -1,3 +1,7 @@
+"""Darwin/macOS implementation of AbstractConfig."""
+# This doesn't actually work:
+# <https://github.com/wemake-services/coverage-conditional-plugin/issues/2#issuecomment-1263899795>
+# pragma: sys-platform-not-darwin
 import pathlib
 import sys
 from typing import Any, Dict, List, Union

pyproject.toml

@@ -17,6 +17,11 @@ plugins = [ "coverage_conditional_plugin" ]
 [tool.coverage.coverage_conditional_plugin.rules]
 sys-platform-win32 = "sys_platform == 'win32'"
 sys-platform-not-win32 = "sys_platform != 'win32'"
+sys-platform-darwin = "sys_platform == 'darwin'"
+sys-platform-not-darwin = "sys_platform != 'darwin'"
+sys-platform-linux = "sys_platform == 'linux'"
+sys-platform-not-linux = "sys_platform != 'linux'"
+sys-platform-known = "sys_platform in ('darwin', 'linux', 'win32')"
 
 [tool.pyright]
 # pythonPlatform = 'Darwin'