[Bugfix] fix benchmark audio timing error and add benchmark test (#1109)

Signed-off-by: wangyu31577 <wangyu31577@hundsun.com>
Co-authored-by: wangyu31577 <wangyu31577@hundsun.com>
Co-authored-by: Hongsheng Liu <liuhongsheng4@huawei.com>

tests/benchmarks/test_serve_cli.py

@@ -0,0 +1,60 @@
+import subprocess
+from pathlib import Path
+
+import pytest
+
+from tests.conftest import OmniServer
+
+models = ["Qwen/Qwen3-Omni-30B-A3B-Instruct"]
+stage_configs = [str(Path(__file__).parent.parent / "e2e" / "stage_configs" / "qwen3_omni_ci.yaml")]
+
+# Create parameter combinations for model and stage config
+test_params = [(model, stage_config) for model in models for stage_config in stage_configs]
+
+
+@pytest.fixture(scope="module")
+def omni_server(request):
+    """Start vLLM-Omni server as a subprocess with actual model weights.
+    Uses session scope so the server starts only once for the entire test session.
+    Multi-stage initialization can take 10-20+ minutes.
+    """
+    model, stage_config_path = request.param
+
+    print(f"Starting OmniServer with model: {model}")
+    print("This may take 10-20+ minutes for initialization...")
+
+    with OmniServer(model, ["--stage-configs-path", stage_config_path, "--stage-init-timeout", "120"]) as server:
+        print("OmniServer started successfully")
+        yield server
+        print("OmniServer stopped")
+
+
+@pytest.mark.parametrize("omni_server", test_params, indirect=True)
+def test_bench_serve_chat(omni_server):
+    command = [
+        "vllm",
+        "bench",
+        "serve",
+        "--omni",
+        "--model",
+        omni_server.model,
+        "--port",
+        str(omni_server.port),
+        "--dataset-name",
+        "random",
+        "--random-input-len",
+        "32",
+        "--random-output-len",
+        "4",
+        "--num-prompts",
+        "5",
+        "--endpoint",
+        "/v1/chat/completions",
+        "--backend",
+        "openai-chat-omni",
+    ]
+    result = subprocess.run(command, capture_output=True, text=True)
+    print(result.stdout)
+    print(result.stderr)
+
+    assert result.returncode == 0, f"Benchmark failed: {result.stderr}"