[Core][Bugfix]Refactor block manager for better testability (#3492)

tests/core/block/e2e/conftest.py

@@ -0,0 +1,56 @@
+import contextlib
+import gc
+
+import pytest
+import ray
+import torch
+
+from vllm import LLM
+from vllm.model_executor.parallel_utils.parallel_state import (
+    destroy_model_parallel)
+from vllm.model_executor.utils import set_random_seed
+
+
+def cleanup():
+    destroy_model_parallel()
+    with contextlib.suppress(AssertionError):
+        torch.distributed.destroy_process_group()
+    gc.collect()
+    torch.cuda.empty_cache()
+    ray.shutdown()
+
+
+@pytest.fixture
+def baseline_llm_generator(common_llm_kwargs, per_test_common_llm_kwargs,
+                           baseline_llm_kwargs, seed):
+    return create_llm_generator(common_llm_kwargs, per_test_common_llm_kwargs,
+                                baseline_llm_kwargs, seed)
+
+
+@pytest.fixture
+def test_llm_generator(common_llm_kwargs, per_test_common_llm_kwargs,
+                       test_llm_kwargs, seed):
+    return create_llm_generator(common_llm_kwargs, per_test_common_llm_kwargs,
+                                test_llm_kwargs, seed)
+
+
+def create_llm_generator(common_llm_kwargs, per_test_common_llm_kwargs,
+                         distinct_llm_kwargs, seed):
+    kwargs = {
+        **common_llm_kwargs,
+        **per_test_common_llm_kwargs,
+        **distinct_llm_kwargs,
+    }
+
+    def generator_inner():
+        llm = LLM(**kwargs)
+
+        set_random_seed(seed)
+
+        yield llm
+        del llm
+        cleanup()
+
+    for llm in generator_inner():
+        yield llm
+        del llm