feat(moriep): add fp4 combine dtype (SGLANG_MORI_COMBINE_DTYPE=fp4) (#30706)

test/manual/ep/test_moriep_combine_dtype.py

@@ -0,0 +1,28 @@
+"""Lightweight (no-GPU) wiring guards for the MoRI blockwise-FP4 combine dtype.
+
+Protects the sglang-side plumbing that exposes ``SGLANG_MORI_COMBINE_DTYPE=fp4`` and maps it to
+MoRI's ``fp4_blockwise`` combine. The end-to-end kernel behaviour is covered by the GPU/eval tests.
+"""
+
+import unittest
+
+from sglang.srt.layers.moe.token_dispatcher.moriep import CombineDtype
+
+
+class TestMoriCombineDtypeFp4(unittest.TestCase):
+    def test_fp4_enum_member_exists(self):
+        self.assertTrue(hasattr(CombineDtype, "fp4"))
+        self.assertEqual(CombineDtype.fp4.value, "fp4_blockwise")
+
+    def test_fp4_value_roundtrip(self):
+        self.assertIs(CombineDtype("fp4_blockwise"), CombineDtype.fp4)
+
+    def test_existing_combine_dtypes_unchanged(self):
+        # Guard against accidentally breaking the existing dtypes when adding fp4.
+        self.assertEqual(CombineDtype.bf16.value, "bfloat16")
+        self.assertEqual(CombineDtype.fp8.value, "float8_blockwise")
+        self.assertEqual(CombineDtype.fp8_direct_cast.value, "float8_direct_cast")
+
+
+if __name__ == "__main__":
+    unittest.main()