luni/src/test/java/libcore/java/util/zip/GZIPOutputStreamTest.java

/*
 * Copyright (C) 2010 The Android Open Source Project
 *
 * 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://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 libcore.java.util.zip;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Arrays;
import java.util.Random;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;
import junit.framework.TestCase;

public final class GZIPOutputStreamTest extends TestCase {
    public void testShortMessage() throws IOException {
        byte[] data = gzip(("Hello World").getBytes("UTF-8"));
        assertEquals("[31, -117, 8, 0, 0, 0, 0, 0, 0, 0, -13, 72, -51, -55, -55, 87, 8, -49, " +
                "47, -54, 73, 1, 0, 86, -79, 23, 74, 11, 0, 0, 0]", Arrays.toString(data));
    }

    public void testLongMessage() throws IOException {
        byte[] data = new byte[1024 * 1024];
        new Random().nextBytes(data);
        assertTrue(Arrays.equals(data, GZIPInputStreamTest.gunzip(gzip(data))));
    }

    public static byte[] gzip(byte[] bytes) throws IOException {
        ByteArrayOutputStream bytesOut = new ByteArrayOutputStream();
        OutputStream gzippedOut = new GZIPOutputStream(bytesOut);
        gzippedOut.write(bytes);
        gzippedOut.close();
        return bytesOut.toByteArray();
    }
}