[AMD] Fix the diffusion perf fixture lookup (#38686)

test/registered/amd/conftest.py

@@ -0,0 +1,10 @@
+"""Make the diffusion perf fixture reachable from this directory.
+
+``DiffusionServerBase`` (subclassed by the diffusion tests here) has an autouse
+fixture that requests ``perf_results``, which is declared in
+``sglang/multimodal_gen/test/server/conftest.py``. pytest resolves conftest.py
+by the collected file's directory, so that declaration never reaches
+``test/registered/``; re-exporting it here is what makes it resolvable.
+"""
+
+from sglang.multimodal_gen.test.server.conftest import perf_results  # noqa: F401

test/registered/amd/test_wan22_fp8_mla.py

@@ -101,13 +101,6 @@ FP8_MLA_CASES = [
 class TestWan22FP8MLA(DiffusionServerBase):
     """AMD test for FP8 MLA attention on Wan2.2-T2V-A14B."""
 
-    @classmethod
-    def teardown_class(cls):
-        try:
-            super().teardown_class()
-        except AttributeError:
-            pass
-
     @pytest.fixture(params=FP8_MLA_CASES, ids=lambda c: c.id)
     def case(self, request) -> DiffusionTestCase:
         return request.param

test/registered/amd/test_zimage_turbo.py

@@ -106,13 +106,6 @@ def _compute_clip_score(image_bytes: bytes, prompt: str) -> float | None:
 class TestZImageTurboAMD(DiffusionServerBase):
     """AMD nightly test for Z-Image-Turbo text-to-image generation."""
 
-    @classmethod
-    def teardown_class(cls):
-        try:
-            super().teardown_class()
-        except AttributeError:
-            pass
-
     @pytest.fixture(params=AMD_ZIMAGE_CASES, ids=lambda c: c.id)
     def case(self, request) -> DiffusionTestCase:
         return request.param