### Question:
ByteBufferUtils { public static int longFitsIn(final long value) { if (value < 0) { return 8; } if (value < (1l << 4 * 8)) { if (value < (1l << 2 * 8)) { if (value < (1l << 1 * 8)) { return 1; } return 2; } if (value < (1l << 3 * 8)) { return 3; } return 4; } if (value < (1l << 6 * 8)) { if (value < (1l << 5 * 8)) { return 5; } return 6; } if (value < (1l << 7 * 8)) { return 7; } return 8; } private  ByteBufferUtils(); static void writeVLong(ByteBuffer out, long i); static long readVLong(ByteBuffer in); static int putCompressedInt(OutputStream out, final int value); static void putInt(OutputStream out, final int value); static void moveBufferToStream(OutputStream out, ByteBuffer in,
      int length); static void copyBufferToStream(OutputStream out, ByteBuffer in,
      int offset, int length); static int putLong(OutputStream out, final long value,
      final int fitInBytes); static int longFitsIn(final long value); static int intFitsIn(final int value); static int readCompressedInt(InputStream input); static int readCompressedInt(ByteBuffer buffer); static long readLong(InputStream in, final int fitInBytes); static long readLong(ByteBuffer in, final int fitInBytes); static void ensureSpace(ByteBuffer out, int length); static void copyFromStreamToBuffer(ByteBuffer out,
      DataInputStream in, int length); static void copyFromBufferToBuffer(ByteBuffer out,
      ByteBuffer in, int sourceOffset, int length); static int findCommonPrefix(ByteBuffer buffer, int offsetLeft,
      int offsetRight, int limit); static int findCommonPrefix(
      byte[] left, int leftOffset, int leftLength,
      byte[] right, int rightOffset, int rightLength); static boolean arePartsEqual(ByteBuffer buffer,
      int offsetLeft, int lengthLeft,
      int offsetRight, int lengthRight); static void skip(ByteBuffer buffer, int length);  }### Answer:
@Test public void testLongFitsIn() { assertEquals(1, ByteBufferUtils.longFitsIn(0)); assertEquals(1, ByteBufferUtils.longFitsIn(1)); assertEquals(3, ByteBufferUtils.longFitsIn(1l << 16)); assertEquals(5, ByteBufferUtils.longFitsIn(1l << 32)); assertEquals(8, ByteBufferUtils.longFitsIn(-1)); assertEquals(8, ByteBufferUtils.longFitsIn(Long.MIN_VALUE)); assertEquals(8, ByteBufferUtils.longFitsIn(Long.MAX_VALUE)); }