From 65fac14f3e10c87e1a965a8dd51fe93d23dc18b9 Mon Sep 17 00:00:00 2001
From: "Wang, Fei" <fwang12@ebay.com>
Date: Wed, 25 Dec 2024 18:14:43 -0800
Subject: [PATCH] ut

---
 .../PrometheusReporterServiceSuite.scala      | 33 +++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 kyuubi-metrics/src/test/scala/org/apache/kyuubi/metrics/PrometheusReporterServiceSuite.scala

diff --git a/kyuubi-metrics/src/test/scala/org/apache/kyuubi/metrics/PrometheusReporterServiceSuite.scala b/kyuubi-metrics/src/test/scala/org/apache/kyuubi/metrics/PrometheusReporterServiceSuite.scala
new file mode 100644
index 00000000000..0996b8c3206
--- /dev/null
+++ b/kyuubi-metrics/src/test/scala/org/apache/kyuubi/metrics/PrometheusReporterServiceSuite.scala
@@ -0,0 +1,33 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.kyuubi.metrics
+
+import org.apache.kyuubi.KyuubiFunSuite
+
+class PrometheusReporterServiceSuite extends KyuubiFunSuite {
+  test("apply extra labels on metrics") {
+    val labels = Map("instance" -> "kyuubi-0")
+    val metrics1 = "kyuubi_backend_service_close_operation{quantile=\"0.5\",}"
+    assert(PrometheusReporterService.applyExtraLabels(metrics1, labels) ==
+      "kyuubi_backend_service_close_operation{quantile=\"0.5\",instance=\"kyuubi-0\"}")
+    val metrics2 = "kyuubi_backend_service_close_operation"
+    assert(PrometheusReporterService.applyExtraLabels(metrics2, labels) ==
+      "kyuubi_backend_service_close_operation{instance=\"kyuubi-0\"}")
+  }
+
+}