### Question:
SwappedDataInputStream extends ProxyInputStream implements DataInput { public double readDouble() throws IOException, EOFException { return EndianUtils.readSwappedDouble( 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 testReadDouble() throws IOException { assertEquals( Double.longBitsToDouble(0x0807060504030201L), this.sdis.readDouble(), 0 ); }