Pytest: add cpp harness (#30471)

cpp harness

pyproject.toml

@@ -2,6 +2,7 @@
 minversion = "6.0"
 addopts = "--ignore=openpilot/ --ignore=cereal/ --ignore=opendbc/ --ignore=panda/ --ignore=rednose_repo/ --ignore=tinygrad_repo/ -Werror --strict-config --strict-markers --durations=10 -n auto --dist=loadgroup"
 cpp_files = "test_*"
+cpp_harness = "selfdrive/test/cpp_harness.py"
 python_files = "test_*.py"
 #timeout = "30"  # you get this long by default
 markers = [

selfdrive/test/cpp_harness.py

@@ -0,0 +1,11 @@
+#!/usr/bin/env python3
+import subprocess
+import sys
+
+from openpilot.common.prefix import OpenpilotPrefix
+
+
+with OpenpilotPrefix():
+  ret = subprocess.call(sys.argv[1:])
+
+exit(ret)