enhance statistics ut coverage (#252)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: Spycsh

tests/cores/mega/test_base_statistics.py

@@ -0,0 +1,59 @@
+# Copyright (C) 2024 Intel Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+import asyncio
+import json
+import time
+import unittest
+
+import requests
+
+from comps import (
+    ServiceOrchestrator,
+    TextDoc,
+    opea_microservices,
+    register_microservice,
+    register_statistics,
+    statistics_dict,
+)
+
+
+@register_microservice(name="s1", host="0.0.0.0", port=8083, endpoint="/v1/add")
+@register_statistics(names=["opea_service@s1_add"])
+async def s1_add(request: TextDoc) -> TextDoc:
+    start = time.time()
+    time.sleep(5)
+    req = request.model_dump_json()
+    req_dict = json.loads(req)
+    text = req_dict["text"]
+    text += "opea"
+    statistics_dict["opea_service@s1_add"].append_latency(time.time() - start, None)
+    return {"text": text}
+
+
+class TestBaseStatistics(unittest.IsolatedAsyncioTestCase):
+    def setUp(self):
+        self.s1 = opea_microservices["s1"]
+        self.s1.start()
+
+        self.service_builder = ServiceOrchestrator()
+        self.service_builder.add(opea_microservices["s1"])
+
+    def tearDown(self):
+        self.s1.stop()
+
+    async def test_base_statistics(self):
+        for _ in range(2):
+            task1 = asyncio.create_task(self.service_builder.schedule(initial_inputs={"text": "hello, "}))
+            await asyncio.gather(task1)
+            result_dict1 = task1.result()
+
+        response = requests.get("http://localhost:8083/v1/statistics")
+        res = response.json()
+        p50 = res["opea_service@s1_add"]["p50_latency"]
+        p99 = res["opea_service@s1_add"]["p99_latency"]
+        self.assertEqual(int(p50), int(p99))
+
+
+if __name__ == "__main__":
+    unittest.main()