[Misc] Deprecate VLLM_OMNI_VOXCPM_CODE_PATH (#7779)

Signed-off-by: Armaan Amatya <armaanamatya2014@gmail.com>

tests/model_executor/models/voxcpm2/test_voxcpm2_import_utils.py

@@ -0,0 +1,37 @@
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM-Omni project
+"""VLLM_OMNI_VOXCPM_CODE_PATH still works but warns that it is deprecated (#6232)."""
+
+from pathlib import Path
+
+import pytest
+
+from vllm_omni.model_executor.models.voxcpm2 import voxcpm2_import_utils
+
+pytestmark = [pytest.mark.core_model, pytest.mark.cpu]
+
+
+def _capture_warnings(monkeypatch) -> list[str]:
+    messages: list[str] = []
+    monkeypatch.setattr(voxcpm2_import_utils.logger, "warning_once", lambda msg, *args: messages.append(msg))
+    return messages
+
+
+def test_code_path_env_warns_and_is_still_used(monkeypatch, tmp_path: Path):
+    messages = _capture_warnings(monkeypatch)
+    monkeypatch.setenv("VLLM_OMNI_VOXCPM_CODE_PATH", str(tmp_path))
+
+    candidates = voxcpm2_import_utils._iter_voxcpm2_src_candidates()
+
+    assert candidates[0] == tmp_path
+    assert len(messages) == 1
+    assert "VLLM_OMNI_VOXCPM_CODE_PATH is deprecated" in messages[0]
+
+
+def test_no_warning_without_code_path_env(monkeypatch):
+    messages = _capture_warnings(monkeypatch)
+    monkeypatch.delenv("VLLM_OMNI_VOXCPM_CODE_PATH", raising=False)
+
+    voxcpm2_import_utils._iter_voxcpm2_src_candidates()
+
+    assert messages == []