content: /*
   * 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.celeborn.common;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertNotEquals;
  
  import org.junit.Test;
  
  // Test data is generated from https://crccalc.com/ using "CRC-32/ISO-HDLC".
  public class CelebornCRC32Test {
  
    @Test
    public void testCompute() {
      byte[] data = "test".getBytes();
      int checksum = CelebornCRC32.compute(data);
      assertEquals(3632233996L, checksum & 0xFFFFFFFFL);
    }
  
    @Test
    public void testComputeWithOffset() {
      byte[] data = "testdata".getBytes();
      int checksum = CelebornCRC32.compute(data, 4, 4);
      assertEquals(2918445923L, checksum & 0xFFFFFFFFL);
    }
  
    @Test
    public void testCombine() {
      int first = 123456789;
      int second = 987654321;
      int combined = CelebornCRC32.combine(first, second);
      assertNotEquals(first, combined);
      assertNotEquals(second, combined);
    }
  
    @Test
    public void testAddChecksum() {
      CelebornCRC32 crc = new CelebornCRC32();
      crc.addChecksum(123456789);
      assertEquals(123456789, crc.get());
    }
  
    @Test
    public void testAddDataWithOffset() {
      CelebornCRC32 crc = new CelebornCRC32();
      byte[] data = "testdata".getBytes();
      crc.addData(data, 4, 4);
      assertEquals(2918445923L, crc.get() & 0xFFFFFFFFL);
    }
  
    @Test
    public void testToString() {
      CelebornCRC32 crc = new CelebornCRC32(123456789);
      assertEquals("CelebornCRC32{current=123456789}", crc.toString());
    }
  }
  