Pick the available container environment for testing

Author: sbdzdz

tests/conftest.py

@@ -0,0 +1,11 @@
+import os
+import shutil
+
+
+def pytest_configure(config):
+    """Auto-detect container runtime if CODECLASH_RUNTIME is not already set."""
+    if "CODECLASH_RUNTIME" not in os.environ:
+        if shutil.which("docker"):
+            os.environ["CODECLASH_RUNTIME"] = "docker"
+        elif shutil.which("singularity"):
+            os.environ["CODECLASH_RUNTIME"] = "singularity"