Adds testcase for PR policy checks

ci/check_pr_policies.py

@@ -0,0 +1,92 @@
+#!/usr/bin/env python3
+import os
+import subprocess
+import sys
+from pathlib import Path
+
+ROOT = Path(".").resolve()
+TEST_DIR = ROOT / "tests"
+CPP_EXTENSIONS = {".c", ".cc", ".cpp", ".cxx", ".h", ".hh", ".hpp", ".hxx"}
+
+TEST_PATTERNS = [
+    "test_{name}.cpp",
+    "test_{name}.h",
+    "{name}_test.cpp",
+    "{name}_test.h",
+    "{name}test.cpp",
+    "{name}test.h",
+    "{name}gtest.cpp",
+    "{name}gtest.h",
+]
+
+def run(cmd: str) -> str:
+    return subprocess.check_output(cmd, shell=True, text=True).strip()
+
+def changed_files():
+    target = os.environ.get("CHANGE_TARGET", "origin/main")
+    out = run(f"git diff --name-only {target}...HEAD")
+    return [line.strip() for line in out.splitlines() if line.strip()]
+
+def is_cpp_file(path: Path) -> bool:
+    return path.suffix.lower() in CPP_EXTENSIONS
+
+def require_clang_format():
+    if not (ROOT / ".clang-format").exists():
+        print("ERROR: .clang-format fehlt im Repository-Root.")
+        sys.exit(1)
+
+def check_format(path: Path):
+    subprocess.check_call(f"clang-format --dry-run --Werror '{path}'", shell=True)
+
+def candidate_names(path: Path):
+    stem = path.stem.lower()
+    names = {stem}
+    for suffix in ["_p", "_impl", "_private", "_priv", "_ui"]:
+        if stem.endswith(suffix):
+            names.add(stem[:-len(suffix)])
+    return sorted(n for n in names if n)
+
+def has_related_test(path: Path) -> bool:
+    if not TEST_DIR.exists():
+        return False
+
+    test_files = [p for p in TEST_DIR.rglob("*") if p.is_file()]
+    test_names = [p.name.lower() for p in test_files]
+
+    for name in candidate_names(path):
+        for pattern in TEST_PATTERNS:
+            if pattern.format(name=name).lower() in test_names:
+                return True
+        for test_name in test_names:
+            if name in test_name and ("test" in test_name or "gtest" in test_name):
+                return True
+    return False
+
+def main():
+    require_clang_format()
+
+    files = changed_files()
+    if not files:
+        print("Keine geänderten Dateien erkannt.")
+        return
+
+    for rel in files:
+        path = ROOT / rel
+        if not path.exists():
+            continue
+        if is_cpp_file(path):
+            print(f"Prüfe: {rel}")
+            try:
+                check_format(path)
+            except subprocess.CalledProcessError:
+                print(f"ERROR: Formatfehler in {rel}")
+                sys.exit(1)
+
+            if not has_related_test(path):
+                print(f"ERROR: Kein passender Test unter tests/ für {rel} gefunden.")
+                sys.exit(1)
+
+    print("Policy-Checks erfolgreich.")
+
+if __name__ == "__main__":
+    main()