/*
 * Licensed to CRATE Technology GmbH ("Crate") under one or more contributor
 * license agreements.  See the NOTICE file distributed with this work for
 * additional information regarding copyright ownership.  Crate 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.
 *
 * However, if you have executed another commercial license agreement
 * with Crate these terms will supersede the license and you may use the
 * software solely pursuant to the terms of the relevant commercial agreement.
 */

package io.crate.operation.reference.sys.cluster;

import io.crate.test.integration.CrateUnitTest;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.node.DiscoveryNodes;
import org.elasticsearch.cluster.service.ClusterService;
import org.hamcrest.Matchers;
import org.junit.Test;

import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;

public class ClusterMasterNodeExpressionTest extends CrateUnitTest {

    @Test
    public void testMasterNodeIdIsNull() throws Exception {
        ClusterService clusterService = mock(ClusterService.class);
        ClusterState state = mock(ClusterState.class);
        DiscoveryNodes nodes = mock(DiscoveryNodes.class);
        when(clusterService.state()).thenReturn(state);
        when(state.nodes()).thenReturn(nodes);
        when(nodes.getMasterNodeId()).thenReturn(null);
        ClusterMasterNodeExpression clusterMasterNodeExpression = new ClusterMasterNodeExpression(clusterService);

        assertThat(clusterMasterNodeExpression.value(), Matchers.nullValue());
    }
}