[Config Refactor 2.5/N] Centralize pipeline registry (#2915)

Signed-off-by: lishunyang <lishunyang12@163.com>

tests/config/test_pipeline_registry.py

@@ -0,0 +1,111 @@
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+"""Tests for the central pipeline registry (2.5/N)."""
+
+from __future__ import annotations
+
+import pytest
+
+from vllm_omni.config.pipeline_registry import (
+    _DIFFUSION_PIPELINES,
+    _OMNI_PIPELINES,
+    _VLLM_OMNI_PIPELINES,
+)
+from vllm_omni.config.stage_config import (
+    _PIPELINE_REGISTRY,
+    PipelineConfig,
+    StageExecutionType,
+    StagePipelineConfig,
+    register_pipeline,
+)
+
+
+class TestCentralRegistryDeclarations:
+    """Every in-tree pipeline must be declared exactly once in the central registry."""
+
+    def test_union_contains_all_omni(self):
+        for key in _OMNI_PIPELINES:
+            assert key in _VLLM_OMNI_PIPELINES
+
+    def test_union_contains_all_diffusion(self):
+        for key in _DIFFUSION_PIPELINES:
+            assert key in _VLLM_OMNI_PIPELINES
+
+    def test_no_duplicate_model_type_between_omni_and_diffusion(self):
+        overlap = set(_OMNI_PIPELINES) & set(_DIFFUSION_PIPELINES)
+        assert not overlap, f"Duplicate model_types across omni/diffusion: {overlap}"
+
+    def test_expected_omni_pipelines_present(self):
+        # Guard against accidental removal during future refactors.
+        assert "qwen2_5_omni" in _OMNI_PIPELINES
+        assert "qwen2_5_omni_thinker_only" in _OMNI_PIPELINES
+        assert "qwen3_omni_moe" in _OMNI_PIPELINES
+        assert "qwen3_tts" in _OMNI_PIPELINES
+
+
+class TestLazyLoading:
+    """Pipelines are imported only on first access."""
+
+    def test_contains_without_import(self):
+        # ``in`` hits the lazy map, not the loaded cache.
+        assert "qwen3_omni_moe" in _PIPELINE_REGISTRY
+
+    def test_getitem_loads_correct_pipeline(self):
+        pipeline = _PIPELINE_REGISTRY["qwen3_omni_moe"]
+        assert pipeline.model_type == "qwen3_omni_moe"
+        assert pipeline.model_arch == "Qwen3OmniMoeForConditionalGeneration"
+
+    def test_unknown_model_type_returns_none_via_get(self):
+        assert _PIPELINE_REGISTRY.get("not_a_real_pipeline") is None
+
+    def test_unknown_model_type_raises_keyerror_via_getitem(self):
+        with pytest.raises(KeyError):
+            _PIPELINE_REGISTRY["not_a_real_pipeline"]
+
+    def test_iteration_yields_registered_pipelines(self):
+        keys = set(_PIPELINE_REGISTRY)
+        assert "qwen2_5_omni" in keys
+        assert "qwen3_omni_moe" in keys
+
+
+class TestDynamicRegistration:
+    """``register_pipeline()`` still works for plugins and tests."""
+
+    def test_register_adds_to_registry(self):
+        custom = PipelineConfig(
+            model_type="_test_dynamic_registration",
+            model_arch="DynamicTestModel",
+            stages=(
+                StagePipelineConfig(
+                    stage_id=0,
+                    model_stage="test",
+                    execution_type=StageExecutionType.LLM_AR,
+                    input_sources=(),
+                    final_output=True,
+                ),
+            ),
+        )
+        register_pipeline(custom)
+        try:
+            assert "_test_dynamic_registration" in _PIPELINE_REGISTRY
+            assert _PIPELINE_REGISTRY["_test_dynamic_registration"] is custom
+        finally:
+            # Don't leak the test registration into other tests.
+            if "_test_dynamic_registration" in _PIPELINE_REGISTRY:
+                del _PIPELINE_REGISTRY["_test_dynamic_registration"]
+
+    def test_dynamic_registration_overrides_lazy_entry(self):
+        # Build a substitute for qwen3_omni_moe that we can distinguish.
+        original = _PIPELINE_REGISTRY["qwen3_omni_moe"]
+        override = PipelineConfig(
+            model_type="qwen3_omni_moe",
+            model_arch="OverriddenArch",
+            stages=original.stages,
+        )
+        register_pipeline(override)
+        try:
+            assert _PIPELINE_REGISTRY["qwen3_omni_moe"].model_arch == "OverriddenArch"
+        finally:
+            # Remove the dynamic override so later tests see the original.
+            if "qwen3_omni_moe" in _PIPELINE_REGISTRY._loaded:
+                del _PIPELINE_REGISTRY["qwen3_omni_moe"]

tests/test_config_factory.py

@@ -23,7 +23,7 @@ from vllm_omni.config.stage_config import (
     register_pipeline,
     strip_parent_engine_args,
 )
-from vllm_omni.engine.arg_utils import internal_blacklist_keys
+from vllm_omni.engine.arg_utils import SHARED_FIELDS, internal_blacklist_keys
 
 
 class TestStageType:
@@ -330,6 +330,9 @@ class TestStageResolutionHelpers:
     """Tests for shared stage override / filtering helpers."""
 
     def test_build_stage_runtime_overrides_ignores_other_stage_and_internal_keys(self):
+        # Pass the same filter set the function uses by default
+        # (orchestrator-only fields plus SHARED_FIELDS so ``model`` is
+        # treated as not-per-stage-overridable).
         overrides = build_stage_runtime_overrides(
             0,
             {
@@ -339,7 +342,7 @@ class TestStageResolutionHelpers:
                 "stage_0_model": "should_be_ignored",
                 "parallel_config": {"world_size": 2},
             },
-            internal_keys=internal_blacklist_keys(),
+            internal_keys=internal_blacklist_keys() | SHARED_FIELDS,
         )
 
         assert overrides["gpu_memory_utilization"] == 0.9
@@ -672,19 +675,27 @@ stages:
 
 
 class TestPipelineDiscovery:
-    """Tests for auto-discovery of pipelines from models/*/pipeline.py."""
+    """Tests for the central pipeline registry (``pipeline_registry._VLLM_OMNI_PIPELINES``)."""
 
-    def test_discover_populates_registry_with_known_models(self):
-        """``_discover_all_pipelines`` imports every pipeline.py so the
-        registry is populated with the built-in models after one call."""
-        from vllm_omni.config.stage_config import _discover_all_pipelines
-
-        _discover_all_pipelines()
-        # These models have a pipeline.py in-tree and must be registered.
+    def test_registry_has_known_models(self):
+        """Built-in pipelines are lazy-loaded from the central declaration
+        on first access; no eager import or discovery walk needed."""
+        # ``in`` triggers the lazy-map lookup without forcing a load.
         assert "qwen2_5_omni" in _PIPELINE_REGISTRY
         assert "qwen3_omni_moe" in _PIPELINE_REGISTRY
         assert "qwen3_tts" in _PIPELINE_REGISTRY
 
+    def test_registry_loads_pipeline_on_getitem(self):
+        """Looking up a registered model_type returns the matching PipelineConfig."""
+        pipeline = _PIPELINE_REGISTRY["qwen3_omni_moe"]
+        assert pipeline.model_type == "qwen3_omni_moe"
+        assert len(pipeline.stages) == 3  # thinker + talker + code2wav
+
+    def test_registry_returns_none_for_unknown(self):
+        """Unknown model_types aren't found; ``get()`` returns None."""
+        assert "definitely_not_a_real_model" not in _PIPELINE_REGISTRY
+        assert _PIPELINE_REGISTRY.get("definitely_not_a_real_model") is None
+
     def test_pipeline_config_supports_hf_architectures(self):
         """PipelineConfig accepts hf_architectures for HF-arch fallback
         (replaces the old _ARCHITECTURE_MODELS dict)."""
@@ -950,7 +961,10 @@ class TestBaseConfigInheritance:
         assert deploy.stages[0].gpu_memory_utilization == 0.9
         assert deploy.connectors is not None
         assert "connector_of_shared_memory" in deploy.connectors
-        assert deploy.async_chunk is True
+        # CI overlay explicitly sets async_chunk: False (see
+        # tests/utils.py::_CI_OVERLAYS and PR #2383 discussion). Overlay
+        # bool overrides base even when the base yaml has async_chunk: true.
+        assert deploy.async_chunk is False
 
     def test_ci_sampling_merge(self):
         from tests.utils import get_deploy_config_path