Fix LTX2 channels-last review scope

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

tests/config/test_omni_config.py

@@ -779,13 +779,8 @@ def test_structured_diffusion_config_rejects_non_boolean_compile_dynamic():
         omni_config_module._DiffusionConfigProjection(diffusion_compile_dynamic="false")
 
 
-def test_structured_diffusion_config_rejects_non_boolean_vae_channels_last_3d():
-    with pytest.raises(ValidationError, match="vae_use_channels_last_3d"):
-        omni_config_module._DiffusionConfigProjection(vae_use_channels_last_3d="true")
-
-
-def test_from_pipeline_config_routes_vae_channels_last_3d(tmp_path):
-    deploy_path = tmp_path / "dreamzero_vae_layout.yaml"
+def test_from_pipeline_config_routes_ltx2_model_extra(tmp_path):
+    deploy_path = tmp_path / "dreamzero_ltx2_extras.yaml"
     deploy_path.write_text(
         "\n".join(
             [
@@ -793,14 +788,15 @@ def test_from_pipeline_config_routes_vae_channels_last_3d(tmp_path):
                 "async_chunk: false",
                 "stages:",
                 "  - stage_id: 0",
-                "    vae_use_channels_last_3d: true",
+                "    extras:",
+                "      ltx2_use_channels_last_3d: true",
             ]
         )
     )
 
     stage = _from_pipeline_key("dreamzero", deploy_config_path=str(deploy_path)).stage_by_id(0)
 
-    assert stage.diffusion_config.vae_use_channels_last_3d is True
+    assert stage.diffusion_config.extras["ltx2_use_channels_last_3d"] is True
 
 
 def test_structured_diffusion_config_rejects_invalid_compile_granularity():

tests/diffusion/models/ltx2/test_ltx2_vae.py

@@ -12,6 +12,21 @@ pytestmark = [pytest.mark.core_model, pytest.mark.cpu]
 
 
 class TestLTXChannelsLast3D:
+    @pytest.mark.parametrize(
+        ("extras", "expected"),
+        [({}, False), ({"ltx2_use_channels_last_3d": True}, True)],
+    )
+    def test_channels_last_opt_in_is_ltx2_model_extra(self, extras, expected):
+        from vllm_omni.diffusion.models.ltx2.ltx2_components import _ltx2_use_channels_last_3d
+
+        assert _ltx2_use_channels_last_3d(SimpleNamespace(extras=extras)) is expected
+
+    def test_channels_last_opt_in_rejects_non_boolean_model_extra(self):
+        from vllm_omni.diffusion.models.ltx2.ltx2_components import _ltx2_use_channels_last_3d
+
+        with pytest.raises(TypeError, match="ltx2_use_channels_last_3d"):
+            _ltx2_use_channels_last_3d(SimpleNamespace(extras={"ltx2_use_channels_last_3d": "true"}))
+
     @pytest.mark.parametrize(
         ("causal", "kernel_size"),
         [

tests/diffusion/test_diffusion_engine.py

@@ -534,18 +534,6 @@ class TestDiffusionCompileConfig:
         with pytest.raises(TypeError, match="diffusion_compile_dynamic"):
             OmniDiffusionConfig(model="test", diffusion_compile_dynamic="false")
 
-    def test_channels_last_3d_is_opt_in_and_strict(self) -> None:
-        assert OmniDiffusionConfig(model="test").vae_use_channels_last_3d is False
-        assert (
-            OmniDiffusionConfig.from_kwargs(
-                model="test",
-                vae_use_channels_last_3d=True,
-            ).vae_use_channels_last_3d
-            is True
-        )
-        with pytest.raises(TypeError, match="vae_use_channels_last_3d"):
-            OmniDiffusionConfig(model="test", vae_use_channels_last_3d="true")
-
     @pytest.mark.parametrize(
         "kwargs, feature",
         [

tests/entrypoints/test_async_omni_diffusion_config.py

@@ -20,7 +20,7 @@ def test_default_stage_config_includes_cache_backend():
             "cache_backend": "cache_dit",
             "cache_config": '{"Fn_compute_blocks": 2}',
             "vae_use_slicing": True,
-            "vae_use_channels_last_3d": True,
+            "extras": {"ltx2_use_channels_last_3d": True},
             "ulysses_degree": 2,
         }
     )[0]
@@ -30,7 +30,7 @@ def test_default_stage_config_includes_cache_backend():
     assert engine_args["cache_backend"] == "cache_dit"
     assert engine_args["cache_config"]["Fn_compute_blocks"] == 2
     assert engine_args["vae_use_slicing"] is True
-    assert engine_args["vae_use_channels_last_3d"] is True
+    assert engine_args["extras"]["ltx2_use_channels_last_3d"] is True
     assert engine_args["parallel_config"].ulysses_degree == 2
     assert engine_args["model_stage"] == "diffusion"
 
@@ -373,25 +373,6 @@ def test_serve_cli_accepts_diffusion_compile_controls():
     assert stage_cfg["engine_args"]["diffusion_compile_dynamic"] is False
 
 
-def test_serve_cli_accepts_vae_channels_last_3d_opt_in():
-    parser = TrackingArgumentParser()
-    subparsers = parser.add_subparsers(dest="command")
-    OmniServeCommand().subparser_init(subparsers)
-    args = parser.parse_args(
-        [
-            "serve",
-            "Lightricks/LTX-2",
-            "--omni",
-            "--vae-use-channels-last-3d",
-        ]
-    )
-
-    stage_cfg = AsyncOmniEngine._create_default_diffusion_stage_cfg(args.get_explicit_kwargs_dict())[0]
-
-    assert args.vae_use_channels_last_3d is True
-    assert stage_cfg["engine_args"]["vae_use_channels_last_3d"] is True
-
-
 def test_serve_cli_accepts_diffusion_attention_backend():
     """Ensure diffusion serve CLI exposes the shorthand backend flag."""
     parser = TrackingArgumentParser()