/*
 * 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.hadoop.hbase.io.asyncfs;

import static org.junit.jupiter.api.Assertions.assertEquals;

import org.apache.hadoop.hbase.testclassification.MiscTests;
import org.apache.hadoop.hbase.testclassification.SmallTests;
import org.junit.jupiter.api.Tag;
import org.junit.jupiter.api.Test;

@Tag(MiscTests.TAG)
@Tag(SmallTests.TAG)
public class TestSendBufSizePredictor {

  @Test
  public void test() {
    SendBufSizePredictor p = new SendBufSizePredictor();
    assertEquals(8 * 1024, p.guess(5 * 1024));
    assertEquals(8 * 1024, p.guess(5 * 1024));
    assertEquals(16 * 1024, p.guess(10 * 1024));
    // it wont reduce directly to 4KB
    assertEquals(8 * 1024, p.guess(4 * 1024));
    // This time it will reduece
    assertEquals(4 * 1024, p.guess(4 * 1024));
  }
}
