### Question:
BitBufferHelper { public static void setBytes(byte[] data, byte[] input, int startOffset, int numBits) throws BufferException { checkExceptions(data, startOffset, numBits); insertBits(data, input, startOffset, numBits); } private  BitBufferHelper(); static byte getByte(byte[] data); static short getShort(byte[] data, int numBits); static short getShort(byte[] data); static int getInt(byte[] data, int numBits); static int getInt(byte[] data); static long getLong(byte[] data, int numBits); static long getLong(byte[] data); static byte[] getBits(byte[] data, int startOffset, int numBits); static void setByte(byte[] data, byte input, int startOffset, int numBits); static void setBytes(byte[] data, byte[] input, int startOffset, int numBits); static int getMSBMask(int numBits); static int getLSBMask(int numBits); static long toNumber(byte[] array); static long toNumber(@Nonnull byte[] array, int numBits); static byte[] toByteArray(Number input); static byte[] toByteArray(Number input, int numBits); static byte[] shiftBitsToMSB(byte[] inputBytes, int numBits); static byte[] shiftBitsToLSB(byte[] inputBytes, int numBits); static void insertBits(byte[] data, byte[] inputdataLSB, int startOffset, int numBits); static void checkExceptions(byte[] data, int startOffset, int numBits); static final long BYTE_MASK; }### Answer:
@Test public void testSetBytes() throws Exception { byte[] input = { 0, 1 }; byte[] data = { 6, 0 }; BitBufferHelper.setBytes(data, input, 7, 9); Assert.assertTrue(data[0] == 6); Assert.assertTrue(data[1] == 1); }