### Question:
BinaryReader { public byte[] peekBytes(int length) { return Arrays.copyOfRange(bytes, position, position + length); } BinaryReader(BinaryReader binaryReader, int position);  BinaryReader(InputStream inputStream, int size);  BinaryReader(byte[] bytes); int read(); int peek(); byte[] peekBytes(int length); byte[] readBytes(int length); void readBytes(byte[] buf, int offset, int length); String readGuid(); String readString(int length); String readWString(int length); UnsignedLong readQWord(); UnsignedInteger readDWord(); UnsignedInteger readDWordBE(); int readWord(); int readWordBE(); Date readFileTime(); String readAndBase64EncodeBinary(int length); void skip(int bytes); int getPosition(); byte[] getBytes(); static final long EPOCH_OFFSET; static final int[][] INDEX_ARRAYS; }### Answer:
@Test public void testPeekBytes() throws IOException { byte[] bytes = "Hello world".getBytes(Charsets.US_ASCII); BinaryReader binaryReader = testBinaryReaderBuilder.put(bytes).build(); assertArrayEquals(Arrays.copyOfRange(bytes, 0, 5), binaryReader.peekBytes(5)); assertEquals(0, binaryReader.getPosition()); }