[CPU] Refactor CPU WNA16 (#28826)

Signed-off-by: jiang1.li <jiang1.li@intel.com>

tests/quantization/test_cpu_wna16.py

@@ -0,0 +1,23 @@
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+import pytest
+
+from vllm.platforms import current_platform
+
+if not current_platform.is_cpu():
+    pytest.skip("skipping CPU-only tests", allow_module_level=True)
+
+MODELS = [
+    "TheBloke/TinyLlama-1.1B-Chat-v1.0-AWQ",
+    "TheBloke/TinyLlama-1.1B-Chat-v1.0-GPTQ",  # with g_idx
+]
+DTYPE = ["bfloat16"]
+
+
+@pytest.mark.parametrize("model", MODELS)
+@pytest.mark.parametrize("dtype", DTYPE)
+def test_ipex_quant(vllm_runner, model, dtype):
+    with vllm_runner(model, dtype=dtype) as llm:
+        output = llm.generate_greedy(["The capital of France is"], max_tokens=32)
+    assert output
+    print(output)