astrein: Exclude tests

CMK-33203

Change-Id: Id3cc54613bb98a0938c1f41461880c677d7a697f

Author: Synss

packages/cmk-astrein/cmk/astrein/checker_module_layers.py

@@ -146,7 +146,7 @@ def _shall_exclude_file_below_packages(relative_path: ModulePath) -> bool:
         rules in the cmk namespace. Dependencies of the package's tests are managed through
         bazel dependencies. We feel no need to enforce cmk module layer rules there.
         """
-        base_paths = ["packages", "non-free/packages"]
+        base_paths = ["tests", "packages", "non-free/packages"]
         for base_path in base_paths:
             if relative_path.is_below(base_path):
                 relative_to_pkg = ModulePath(*relative_path.relative_to(base_path).parts[1:])