Add CLI subcommand tests driving main()

cli.py is the largest module in the package (881 lines) and had a
single test. Drive main() per subcommand via sys.argv, which also
covers the table and manifest rendering helpers through their output:

- argument parsing: no arguments shows the help, an unknown command
  exits, and site-only commands are absent without a site context
- read-only commands: path-config-template, template, find (table and
  json), inspect (table and json), list, show-all
- the add -> enable -> disable -> release/remove lifecycle against a
  real store on tmp_path, asserting the state shown by list
- the error surface: unknown packages return 1 and report to stderr,
  and --debug re-raises instead

Change-Id: I15091ec6ec964ecd4f989c759b6546f3720b3e20

Author: mo-ki

packages/cmk-mkp-tool/cmk/mkp_tool/cli.py

@@ -783,7 +783,7 @@ def _get_package_id(
             )
 
 
-def _parse_arguments(argv: list[str], site_context: SiteContext | None) -> argparse.Namespace:
+def _parse_arguments(argv: Sequence[str], site_context: SiteContext | None) -> argparse.Namespace:
     parser = argparse.ArgumentParser(
         prog="mkp",
         description=__doc__,
@@ -862,8 +862,9 @@ def main(
     path_config: PathConfig | None = None,
     site_context: SiteContext | None = None,
     persisting_function: Callable[[Path, bytes], None] = simple_file_write,
+    argv: Sequence[str] = sys.argv[1:] or ["--help"],
 ) -> int:
-    args = _parse_arguments(sys.argv[1:] or ["--help"], site_context)
+    args = _parse_arguments(argv, site_context)
     set_up_logging(args.verbose)
 
     try: