[Core] Fix standalone runs of test_reset_prefix_cache_e2e (#29899)

Signed-off-by: Mark McLoughlin <markmc@redhat.com>

[Core] Fix standalone runs of test_reset_prefix_cache_e2e (#29899)
Signed-off-by: Mark McLoughlin <markmc@redhat.com>
899e2ef5 · Mark McLoughlin · GitHub · 68eb5c8d · 899e2ef5
Unverified Commit 899e2ef5 authored Dec 04, 2025 by Mark McLoughlin Committed by GitHub Dec 04, 2025
Show whitespace changes
Inline Side-by-side

Showing with 3 additions and 1 deletion

tests/v1/core/test_reset_prefix_cache_e2e.py tests/v1/core/test_reset_prefix_cache_e2e.py +3 -1

No files found.
--- a/tests/v1/core/test_reset_prefix_cache_e2e.py
+++ b/tests/v1/core/test_reset_prefix_cache_e2e.py
@@ -11,7 +11,9 @@ PROMPTS = [
 ]


-def test_reset_prefix_cache_e2e():
+def test_reset_prefix_cache_e2e(monkeypatch):
+    # "spawn" is required for test to be deterministic
+    monkeypatch.setenv("VLLM_WORKER_MULTIPROC_METHOD", "spawn")
    engine_args = EngineArgs(
        model="Qwen/Qwen3-0.6B",
        gpu_memory_utilization=0.2,