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Interfaces, classes and resources to enable Kubernetes testing

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/*
 * File: K8sRule.java
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * The contents of this file are subject to the terms and conditions of
 * the Common Development and Distribution License 1.0 (the "License").
 *
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the License by consulting the LICENSE.txt file
 * distributed with this file, or by consulting https://oss.oracle.com/licenses/CDDL
 *
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file LICENSE.txt.
 *
 * MODIFICATIONS:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 */

package com.oracle.bedrock.runtime.k8s;

import org.junit.rules.ExternalResource;

/**
 * A JUnit {@link ExternalResource} that runs a LinuxKit Kubernetes cluster
 * 
 * Copyright (c) 2018. All Rights Reserved. Oracle Corporation.

 * Oracle is a registered trademark of Oracle Corporation and/or its affiliates.
 *
 * @author Jonathan Knight
 */
public class K8sRule
        extends ExternalResource
{
    /**
     * The K8s cluster to use.
     */
    private final K8sCluster cluster;

    /**
     * Create a K8s rule.
     */
    public K8sRule()
    {
        this.cluster = new K8sCluster();
    }

    /**
     * Create a K8s rule.
     *
     * @param cluster  the K8s cluster to use.
     */
    public K8sRule(K8sCluster cluster)
    {
        this.cluster = cluster;
    }

    /**
     * Obtain the k8s cluster.
     *
     * @return  the k8s cluster
     */
    public K8sCluster getCluster()
    {
        return cluster;
    }

    @Override
    protected void before()
    {
        cluster.start();
    }

    @Override
    protected void after()
    {
        cluster.close();
    }
}