solr/core/src/test/org/apache/solr/core/backup/FileGenerationTest.java

/*
 * 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.solr.core.backup;

import java.util.Optional;

import org.junit.Test;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

public class FileGenerationTest {

  @Test
  public void test() {
    FileGeneration fileGen = FileGeneration.zeroGen("backup.properties");
    assertEquals("backup.properties", fileGen.getFileName());
    fileGen = fileGen.nextGen();
    assertEquals("backup-1.properties", fileGen.getFileName());
    fileGen = fileGen.nextGen();
    assertEquals("backup-2.properties", fileGen.getFileName());

    fileGen = FileGeneration.findMostRecent("backup.properties",
        new String[] {"aaa", "baa.properties", "backup.properties",
            "backup-1.properties", "backup-2.properties", "backup-neqewq.properties", "backup999.properties"}).get();
    assertEquals("backup-2.properties", fileGen.getFileName());
    fileGen = fileGen.nextGen();
    assertEquals("backup-3.properties", fileGen.getFileName());

    Optional<FileGeneration> op = FileGeneration.findMostRecent("backup.properties",
        new String[0]);
    assertTrue(op.isEmpty());
  }
}