Skip live engine tests without openra_train

tests/conftest.py

@@ -0,0 +1,30 @@
+"""Shared pytest collection guards for optional Rust-engine tests."""
+from __future__ import annotations
+
+import importlib.util
+import inspect
+
+import pytest
+
+
+_ENGINE_SKIP = pytest.mark.skip(reason="Rust env wheel not installed")
+_ENGINE_TOKENS = ("run_level(", "RustEnvPool(")
+
+
+def pytest_collection_modifyitems(config, items):
+    """Skip live Rust-engine tests when the openra_train wheel is absent.
+
+    CI for this repo installs Python requirements but does not build the
+    optional OpenRA-Rust extension. Structural/schema tests should still run;
+    only tests that directly exercise the live engine via run_level or
+    RustEnvPool are skipped.
+    """
+    if importlib.util.find_spec("openra_train") is not None:
+        return
+    for item in items:
+        try:
+            src = inspect.getsource(item.obj)
+        except (OSError, TypeError):
+            continue
+        if any(token in src for token in _ENGINE_TOKENS):
+            item.add_marker(_ENGINE_SKIP)