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

markmc · web-flow · commit 899e2ef558e7 · 2025-12-04T16:22:03.000+08:00
Signed-off-by: Mark McLoughlin &lt;markmc@redhat.com&gt;
diff --git a/tests/v1/core/test_reset_prefix_cache_e2e.py b/tests/v1/core/test_reset_prefix_cache_e2e.py
@@ -11,7 +11,9 @@
 ]
 
 
-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,

Original file line number	Diff line number	Diff line change
`@@ -11,7 +11,9 @@`
`11`	`11`	`]`
`12`	`12`
`13`	`13`
`14`		`-def test_reset_prefix_cache_e2e():`
	`14`	`+def test_reset_prefix_cache_e2e(monkeypatch):`
	`15`	`+ # "spawn" is required for test to be deterministic`
	`16`	`+ monkeypatch.setenv("VLLM_WORKER_MULTIPROC_METHOD", "spawn")`
`15`	`17`	`engine_args = EngineArgs(`
`16`	`18`	`model="Qwen/Qwen3-0.6B",`
`17`	`19`	`gpu_memory_utilization=0.2,`