CRC32ChecksumInputStreamTest.java

/*
 * Copyright 2010-2015 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed 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://aws.amazon.com/apache2.0
 *
 * This file 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 com.amazonaws.util;

import static org.junit.Assert.assertEquals;

import org.junit.Test;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.util.zip.CRC32;

/**
 * Test CRC32ChecksumInputStream can calculate CRC32 checksum correctly.
 */
public class CRC32ChecksumInputStreamTest {

    private final String TEST_DARA = "Jason, Yifei, Zach";

    @Test
    public void testCRC32Checksum() throws IOException {
        CRC32 crc32 = new CRC32();
        crc32.update(TEST_DARA.getBytes(StringUtils.UTF8));
        long expectedCRC32Checksum = crc32.getValue();
        CRC32ChecksumCalculatingInputStream crc32InputStream = new CRC32ChecksumCalculatingInputStream(
                new ByteArrayInputStream(TEST_DARA.getBytes(StringUtils.UTF8)));
        while (crc32InputStream.read() != -1)
            ;
        assertEquals(expectedCRC32Checksum, crc32InputStream.getCRC32Checksum());
    }

}