Github user zentol commented on a diff in the pull request:
https://github.com/apache/flink/pull/3833#discussion_r116368672
--- Diff:
flink-metrics/flink-metrics-prometheus/src/test/java/org/apache/flink/metrics/prometheus/PrometheusReporterTest.java
---
@@ -0,0 +1,192 @@
+/*
+ * 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.flink.metrics.prometheus;
+
+import com.mashape.unirest.http.HttpResponse;
+import com.mashape.unirest.http.Unirest;
+import com.mashape.unirest.http.exceptions.UnirestException;
+import org.apache.flink.configuration.ConfigConstants;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.configuration.MetricOptions;
+import org.apache.flink.metrics.Counter;
+import org.apache.flink.metrics.Gauge;
+import org.apache.flink.metrics.Histogram;
+import org.apache.flink.metrics.Meter;
+import org.apache.flink.metrics.Metric;
+import org.apache.flink.metrics.SimpleCounter;
+import org.apache.flink.metrics.reporter.MetricReporter;
+import org.apache.flink.metrics.util.TestMeter;
+import org.apache.flink.runtime.metrics.MetricRegistry;
+import org.apache.flink.runtime.metrics.MetricRegistryConfiguration;
+import org.apache.flink.runtime.metrics.groups.FrontMetricGroup;
+import org.apache.flink.runtime.metrics.groups.TaskManagerMetricGroup;
+import org.apache.flink.runtime.metrics.util.TestingHistogram;
+import org.apache.flink.util.TestLogger;
+import org.junit.After;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+
+import java.util.Arrays;
+
+import static
org.apache.flink.metrics.prometheus.PrometheusReporter.ARG_PORT;
+import static
org.apache.flink.runtime.metrics.scope.ScopeFormat.SCOPE_SEPARATOR;
+import static org.hamcrest.Matchers.both;
+import static org.hamcrest.Matchers.containsString;
+import static org.hamcrest.Matchers.equalTo;
+import static org.junit.Assert.assertThat;
+
+public class PrometheusReporterTest extends TestLogger {
+ private static final int NON_DEFAULT_PORT = 9429;
+
+ private static final String HOST_NAME = "hostname";
+ private static final String TASK_MANAGER = "tm";
+
+ private static final String HELP_PREFIX = "# HELP ";
+ private static final String TYPE_PREFIX = "# TYPE ";
+ private static final String DIMENSIONS = "host=\"" + HOST_NAME +
"\",tm_id=\"" + TASK_MANAGER + "\"";
+ private static final String DEFAULT_LABELS = "{" + DIMENSIONS + ",}";
+ private static final String SCOPE_PREFIX = "taskmanager_";
+
+ @Rule
+ public ExpectedException thrown = ExpectedException.none();
+
+ private MetricRegistry registry = prepareMetricRegistry();
--- End diff --
could be final.
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