WIP: add nanobind leak detector

tests/conftest.py

@@ -1,4 +1,8 @@
 import os
+import sys
+
+from io import StringIO
+from typing import Generator
 
 import pytest
 
@@ -7,3 +11,63 @@
 def setup_test_environment():
     """Set up test environment variables for all tests."""
     os.environ.setdefault("LAUNCHPAD_ENV", "TEST")
+
+
+class NanobindLeakDetector:
+    """Captures stderr and detects nanobind leak messages."""
+
+    def __init__(self):
+        self.original_stderr = sys.stderr
+        self.captured_stderr = StringIO()
+        self.leak_detected = False
+        self.leak_messages: list[str] = []
+
+    def start_capture(self):
+        """Start capturing stderr."""
+        sys.stderr = self.captured_stderr
+
+    def stop_capture_and_check(self):
+        """Stop capturing stderr and check for nanobind leaks."""
+        # Restore original stderr
+        sys.stderr = self.original_stderr
+
+        # Get captured content
+        captured_content = self.captured_stderr.getvalue()
+
+        # Check for nanobind leak messages
+        lines = captured_content.split("\n")
+        leak_lines = [line for line in lines if "nanobind: leaked" in line.lower()]
+
+        if leak_lines:
+            self.leak_detected = True
+            self.leak_messages.extend(leak_lines)
+
+        # Write captured content to original stderr so it's still visible
+        if captured_content:
+            self.original_stderr.write(captured_content)
+
+        # Reset for next capture
+        self.captured_stderr = StringIO()
+
+
+@pytest.fixture(autouse=True)
+def nanobind_leak_detector() -> Generator[NanobindLeakDetector, None, None]:
+    """Fixture that detects nanobind memory leaks during test execution."""
+    detector = NanobindLeakDetector()
+
+    # Start capturing before the test
+    detector.start_capture()
+
+    try:
+        yield detector
+    finally:
+        detector.stop_capture_and_check()
+
+        if detector.leak_detected:
+            leak_summary = "\n".join(f"  • {msg}" for msg in detector.leak_messages)
+            pytest.fail(
+                f"❌ NANOBIND MEMORY LEAK DETECTED ❌\n\n"
+                f"This change caused nanobind memory leaks, which can lead to dangerous memory issues.\n"
+                f"Please review your code to ensure that all LIEF objects are properly cleaned up.\n\n"
+                f"Leak messages detected:\n{leak_summary}\n\n"
+            )

tests/unit/test_large_audio_file_insight.py

@@ -20,6 +20,11 @@ def test_generate_with_large_audio_files(self):
             treemap_type=TreemapType.ASSETS,
             hash_md5="hash1",
         )
+        import sys
+
+        print("DEBUG: About to write to stderr", file=sys.stdout)
+        print("nanobind: leaked telkins", file=sys.stderr)
+        print("DEBUG: Just wrote to stderr", file=sys.stdout)
         large_audio_2 = FileInfo(
             full_path="assets/large_wav.wav",
             path="assets/large_wav.wav",