Add cache hit rate UT (#18566)

test/registered/radix_cache/test_radix_cache_hit.py

@@ -0,0 +1,46 @@
+import unittest
+
+from sglang.srt.utils import kill_process_tree
+from sglang.test.ci.ci_register import register_cuda_ci
+from sglang.test.kits.cache_hit_kit import run_multiturn_cache_hit_test
+from sglang.test.test_utils import (
+    DEFAULT_SMALL_MODEL_NAME_FOR_TEST,
+    DEFAULT_TIMEOUT_FOR_SERVER_LAUNCH,
+    DEFAULT_URL_FOR_TEST,
+    CustomTestCase,
+    popen_launch_server,
+)
+
+register_cuda_ci(est_time=120, suite="stage-b-test-small-1-gpu")
+
+MODEL = DEFAULT_SMALL_MODEL_NAME_FOR_TEST
+
+
+class TestRadixCacheHit(CustomTestCase):
+    @classmethod
+    def setUpClass(cls):
+        cls.model = MODEL
+        cls.base_url = DEFAULT_URL_FOR_TEST
+        cls.process = popen_launch_server(
+            cls.model,
+            cls.base_url,
+            timeout=DEFAULT_TIMEOUT_FOR_SERVER_LAUNCH,
+        )
+
+    @classmethod
+    def tearDownClass(cls):
+        kill_process_tree(cls.process.pid)
+
+    def test_multiturn_cache_hit(self):
+        run_multiturn_cache_hit_test(
+            base_url=self.base_url,
+            model_path=self.model,
+            num_clients=8,
+            num_rounds=6,
+            request_length=289,
+            output_length=367,
+        )
+
+
+if __name__ == "__main__":
+    unittest.main()