Bzip2DecoderTest Class — netty Architecture

Source Code

codec-compression/src/test/java/io/netty/handler/codec/compression/Bzip2DecoderTest.java lines 32–200

public class Bzip2DecoderTest extends AbstractDecoderTest {

    private static final byte[] DATA = { 0x42, 0x5A, 0x68, 0x37, 0x31, 0x41, 0x59, 0x26, 0x53,
                                         0x59, 0x77, 0x7B, (byte) 0xCA, (byte) 0xC0, 0x00, 0x00,
                                         0x00, 0x05, (byte) 0x80, 0x00, 0x01, 0x02, 0x00, 0x04,
                                         0x20, 0x20, 0x00, 0x30, (byte) 0xCD, 0x34, 0x19, (byte) 0xA6,
                                         (byte) 0x89, (byte) 0x99, (byte) 0xC5, (byte) 0xDC, (byte) 0x91,
                                         0x4E, 0x14, 0x24, 0x1D, (byte) 0xDE, (byte) 0xF2, (byte) 0xB0, 0x00 };

    public Bzip2DecoderTest() throws Exception {
    }

    @Override
    protected EmbeddedChannel createChannel() {
        return new EmbeddedChannel(new Bzip2Decoder());
    }

    private void writeInboundDestroyAndExpectDecompressionException(ByteBuf in) {
        try {
            channel.writeInbound(in);
        } finally {
            try {
                destroyChannel();
                fail();
            } catch (DecompressionException ignored) {
                // expected
            }
        }
    }

    @Test
    public void testUnexpectedStreamIdentifier() {
        final ByteBuf in = Unpooled.buffer();
        in.writeLong(1823080128301928729L); //random value
        assertThrows(DecompressionException.class, new Executable() {
            @Override
            public void execute() {
                writeInboundDestroyAndExpectDecompressionException(in);
            }
        }, "Unexpected stream identifier contents");
    }

    @Test
    public void testInvalidBlockSize() {
        final ByteBuf in = Unpooled.buffer();
        in.writeMedium(MAGIC_NUMBER);
        in.writeByte('0');  //incorrect block size

        assertThrows(DecompressionException.class, new Executable() {
            @Override
            public void execute() {
                channel.writeInbound(in);
            }
        }, "block size is invalid");
    }

    @Test
    public void testBadBlockHeader() {
        final ByteBuf in = Unpooled.buffer();
        in.writeMedium(MAGIC_NUMBER);
        in.writeByte('1');  //block size
        in.writeMedium(11); //incorrect block header
        in.writeMedium(11); //incorrect block header
        in.writeInt(11111); //block CRC

        assertThrows(DecompressionException.class, new Executable() {
            @Override
            public void execute() {
                channel.writeInbound(in);
            }
        }, "bad block header");
    }

    @Test
    public void testStreamCrcErrorOfEmptyBlock() {
        final ByteBuf in = Unpooled.buffer();
        in.writeMedium(MAGIC_NUMBER);
        in.writeByte('1');  //block size
        in.writeMedium(END_OF_STREAM_MAGIC_1);
        in.writeMedium(END_OF_STREAM_MAGIC_2);
        in.writeInt(1);  //wrong storedCombinedCRC