Refactor pkgmgr CLI into modular core and add E2E tests for config/release/make/tools (see ChatGPT conversation 2025-12-08 https://chatgpt.com/share/6936ffa5-4868-800f-ab63-6e367093adce)

tests/e2e/test_integration_release_commands.py

@@ -0,0 +1,63 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+"""
+Integration tests for the `pkgmgr release` command.
+
+We deliberately only test a *negative* path here, to avoid mutating
+the real repositories (bumping versions, editing changelogs) during
+CI runs.
+
+The test verifies that:
+
+  - Calling `pkgmgr release` with a non-existent repository identifier
+    results in a non-zero exit code and a helpful error.
+"""
+
+from __future__ import annotations
+
+import runpy
+import sys
+import unittest
+
+
+class TestIntegrationReleaseCommand(unittest.TestCase):
+    """
+    E2E tests for `pkgmgr release`.
+    """
+    
+    def _run_release_expect_failure(self) -> None:
+        cmd_repr = "pkgmgr release patch does-not-exist-xyz"
+        original_argv = list(sys.argv)
+
+        try:
+            sys.argv = [
+                "pkgmgr",
+                "release",
+                "patch",
+                "does-not-exist-xyz",
+            ]
+            try:
+                runpy.run_module("main", run_name="__main__")
+            except SystemExit as exc:
+                code = exc.code if isinstance(exc.code, int) else str(exc.code)
+                # Hier wirklich verifizieren:
+                assert code != 0, f"{cmd_repr!r} unexpectedly succeeded with exit code 0"
+                print("[TEST] pkgmgr release failed as expected")
+                print(f"[TEST] Command   : {cmd_repr}")
+                print(f"[TEST] Exit code : {code}")
+            else:
+                # Kein SystemExit -> auf jeden Fall falsch
+                raise AssertionError(
+                    f"{cmd_repr!r} returned normally (expected non-zero exit)."
+                )
+        finally:
+            sys.argv = original_argv
+
+
+    def test_release_for_unknown_repo_fails_cleanly(self) -> None:
+        self._run_release_expect_failure()
+
+if __name__ == "__main__":
+    unittest.main()
+