test/unit/org/apache/cassandra/dht/RandomPartitionerTest.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.cassandra.dht;

import java.math.BigInteger;

import org.junit.Test;

public class RandomPartitionerTest extends PartitionerTestCase
{
    public void initPartitioner()
    {
        partitioner = RandomPartitioner.instance;
    }

    protected boolean shouldStopRecursion(Token left, Token right)
    {
        return left.size(right) < Math.scalb(1, -112);
    }

    @Test
    public void testSplit()
    {
        assertSplit(tok("a"), tok("b"), 16);
        assertSplit(tok("a"), tok("bbb"), 16);
    }

    @Test
    public void testSplitWrapping()
    {
        assertSplit(tok("b"), tok("a"), 16);
        assertSplit(tok("bbb"), tok("a"), 16);
    }

    @Test
    public void testSplitExceedMaximumCase()
    {
        RandomPartitioner.BigIntegerToken left = new RandomPartitioner.BigIntegerToken(RandomPartitioner.MAXIMUM.subtract(BigInteger.valueOf(10)));

        assertSplit(left, tok("a"), 16);
    }
}