/*
 * 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.runtime.rest.messages.job.metrics;

import org.apache.flink.runtime.rest.messages.JobIDPathParameter;
import org.apache.flink.runtime.rest.messages.JobVertexIdPathParameter;

import org.junit.Test;

import static org.hamcrest.Matchers.equalTo;
import static org.hamcrest.Matchers.instanceOf;
import static org.junit.Assert.assertThat;

/**
 * Tests for {@link JobVertexMetricsHeaders}.
 */
public class JobVertexMetricsHeadersTest {

	private final JobVertexMetricsHeaders jobVertexMetricsHeaders = JobVertexMetricsHeaders
		.getInstance();

	@Test
	public void testUrl() {
		assertThat(jobVertexMetricsHeaders.getTargetRestEndpointURL(),
			equalTo("/jobs/:" + JobIDPathParameter.KEY + "/vertices/:" +
				JobVertexIdPathParameter.KEY + "/metrics"));
	}

	@Test
	public void testMessageParameters() {
		assertThat(jobVertexMetricsHeaders.getUnresolvedMessageParameters(),
			instanceOf(JobVertexMetricsMessageParameters.class));
	}

}

Add unit tests JobVertexMetricsHeadersTest