[Model] Add native MAGI-2 Preview diffusion support (#5918)

Signed-off-by: Hongsheng Liu <liuhongsheng4@huawei.com>
Signed-off-by: hsliuustc0106 <liuhongsheng4@huawei.com>

tests/model_extras/test_model_extras.py

@@ -1,5 +1,5 @@
 # SPDX-License-Identifier: Apache-2.0
-# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM-Omni project
 
 from __future__ import annotations
 
@@ -194,6 +194,23 @@ def test_cosmos3_extra_registry_declares_request_and_response_params(pipeline_na
     assert should_init_extra_args_for_non_diffusion_stages(pipeline_name) is False
 
 
+@pytest.mark.core_model
+@pytest.mark.cpu
+def test_magi2_extra_registry_is_preview_only() -> None:
+    assert get_extra_body_params("Magi2Pipeline") == frozenset(
+        {
+            "seconds",
+            "resolution",
+            "image_path",
+            "output_width",
+            "output_height",
+            "deterministic",
+        }
+    )
+    assert get_extra_output_params("Magi2Pipeline") == frozenset()
+    assert should_init_extra_args_for_non_diffusion_stages("Magi2Pipeline") is False
+
+
 @pytest.mark.core_model
 @pytest.mark.cpu
 def test_ltx_extra_registry_declares_official_guidance_params() -> None: