[ci] Fix sampler tests (#11922)

Signed-off-by: youkaichao <youkaichao@gmail.com>

.buildkite/test-pipeline.yaml

@@ -214,6 +214,7 @@ steps:
   - vllm/model_executor/layers
   - vllm/sampling_metadata.py
   - tests/samplers
+  - tests/conftest.py
   commands:
     - pytest -v -s samplers
     - VLLM_USE_FLASHINFER_SAMPLER=1 pytest -v -s samplers

tests/conftest.py

@@ -28,12 +28,13 @@ from vllm.distributed import (cleanup_dist_env_and_memory,
                               init_distributed_environment,
                               initialize_model_parallel)
 from vllm.inputs import (ExplicitEncoderDecoderPrompt, TextPrompt,
-                         to_enc_dec_tuple_list, zip_enc_dec_prompts)
+                         TokensPrompt, to_enc_dec_tuple_list,
+                         zip_enc_dec_prompts)
 from vllm.logger import init_logger
 from vllm.outputs import RequestOutput
 from vllm.sampling_params import BeamSearchParams
 from vllm.utils import (STR_DTYPE_TO_TORCH_DTYPE, cuda_device_count_stateless,
-                        identity)
+                        identity, is_list_of)
 
 logger = init_logger(__name__)
 
@@ -886,6 +887,12 @@ class VllmRunner:
         beam_width: int,
         max_tokens: int,
     ) -> List[Tuple[List[List[int]], List[str]]]:
+        if is_list_of(prompts, str, check="all"):
+            prompts = [TextPrompt(prompt=prompt) for prompt in prompts]
+        else:
+            prompts = [
+                TokensPrompt(prompt_token_ids=tokens) for tokens in prompts
+            ]
         outputs = self.model.beam_search(
             prompts,
             BeamSearchParams(beam_width=beam_width, max_tokens=max_tokens))