### Question:
SwappedDataInputStream extends ProxyInputStream implements DataInput { public long readLong() throws IOException, EOFException { return EndianUtils.readSwappedLong( in ); } SwappedDataInputStream( final InputStream input ); boolean readBoolean(); byte readByte(); char readChar(); double readDouble(); float readFloat(); void readFully( final byte[] data ); void readFully( final byte[] data, final int offset, final int length ); int readInt(); String readLine(); long readLong(); short readShort(); int readUnsignedByte(); int readUnsignedShort(); String readUTF(); int skipBytes( final int count );  }### Answer:
@Test public void testReadLong() throws IOException { assertEquals( 0x0807060504030201L, this.sdis.readLong() ); }