chore: import upstream snapshot with attribution

python/ray/data/tests/unit/conftest.py

@@ -0,0 +1,24 @@
+import time
+
+import pytest
+
+import ray
+
+
+@pytest.fixture(autouse=True)
+def disallow_ray_init(monkeypatch):
+    def raise_on_init(*args, **kwargs):
+        raise RuntimeError("Unit tests should not depend on Ray being initialized.")
+
+    monkeypatch.setattr(ray, "init", raise_on_init)
+
+
+@pytest.fixture(autouse=True)
+def disallow_time_sleep(monkeypatch):
+    def raise_on_sleep(seconds):
+        raise RuntimeError(
+            f"Unit tests should not use time.sleep({seconds}). "
+            "Unit tests should be fast and deterministic."
+        )
+
+    monkeypatch.setattr(time, "sleep", raise_on_sleep)