[Misc] Add SPDX-FileCopyrightText (#19100)

Signed-off-by: simon-mo <simon.mo@hey.com>

tests/basic_correctness/test_basic_correctness.py

@@ -1,4 +1,5 @@
 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 """Compare the short outputs of HF and vLLM when using greedy sampling.
 
 Run `pytest tests/basic_correctness/test_basic_correctness.py`.

tests/basic_correctness/test_chunked_prefill.py

@@ -1,4 +1,5 @@
 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 """Compare the outputs of HF and vLLM when using greedy sampling.
 
 It tests chunked prefill. Chunked prefill can be enabled by

tests/basic_correctness/test_cpu_offload.py

@@ -1,4 +1,5 @@
 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 
 from ..utils import compare_two_settings
 

tests/basic_correctness/test_cumem.py

@@ -1,4 +1,5 @@
 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 
 import pytest
 import torch

tests/basic_correctness/test_preemption.py

@@ -1,4 +1,5 @@
 # SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 """Compare the short outputs of HF and vLLM when using greedy sampling.
 
 VLLM_TEST_ENABLE_ARTIFICIAL_PREEMPT=1 has to be set before running this test.