[Bugfix] Allow Fish Speech phoneme-control tokens through normalize_fish_speech_text (#7043)

Signed-off-by: Pujitha Paladugu <10557236+pujitha24@users.noreply.github.com>
Co-authored-by: Pujitha Paladugu <10557236+pujitha24@users.noreply.github.com>

tests/model_executor/models/fish_speech/test_prompt_utils.py

@@ -0,0 +1,23 @@
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM-Omni project
+
+import pytest
+
+from vllm_omni.model_executor.models.fish_speech.prompt_utils import normalize_fish_speech_text
+
+pytestmark = [pytest.mark.core_model, pytest.mark.cpu]
+
+
+def test_normalize_fish_speech_text_allows_phoneme_control_tokens():
+    text = "Deploy with <|phoneme_start|>K UW2 B ER0 N EH1 T IY0 Z<|phoneme_end|>."
+
+    assert normalize_fish_speech_text(text) == text
+
+
+def test_normalize_fish_speech_text_rejects_unknown_control_token():
+    with pytest.raises(ValueError, match=r"unsupported control token\(s\): <\|foo\|>"):
+        normalize_fish_speech_text("<|foo|>hello")
+
+
+def test_normalize_fish_speech_text_normalizes_legacy_speaker_tag():
+    assert normalize_fish_speech_text("<speaker:0>hello") == "<|speaker:0|>hello"