### Question:
Base64 extends BaseNCodec { @Deprecated public static boolean isArrayByteBase64(final byte[] arrayOctet) { return isBase64(arrayOctet); } Base64();  Base64(final boolean urlSafe);  Base64(final int lineLength);  Base64(final int lineLength, final byte[] lineSeparator);  Base64(final int lineLength, final byte[] lineSeparator, final boolean urlSafe); boolean isUrlSafe(); @Deprecated static boolean isArrayByteBase64(final byte[] arrayOctet); static boolean isBase64(final byte octet); static boolean isBase64(final String base64); static boolean isBase64(final byte[] arrayOctet); static byte[] encodeBase64(final byte[] binaryData); static String encodeBase64String(final byte[] binaryData); static byte[] encodeBase64URLSafe(final byte[] binaryData); static String encodeBase64URLSafeString(final byte[] binaryData); static byte[] encodeBase64Chunked(final byte[] binaryData); static byte[] encodeBase64(final byte[] binaryData, final boolean isChunked); static byte[] encodeBase64(final byte[] binaryData, final boolean isChunked, final boolean urlSafe); static byte[] encodeBase64(final byte[] binaryData, final boolean isChunked,
                                      final boolean urlSafe, final int maxResultSize); static byte[] decodeBase64(final String base64String); static byte[] decodeBase64(final byte[] base64Data); static BigInteger decodeInteger(final byte[] pArray); static byte[] encodeInteger(final BigInteger bigInt);  }### Answer:
@Test public void testIsArrayByteBase64() { assertFalse(Base64.isBase64(new byte[]{Byte.MIN_VALUE})); assertFalse(Base64.isBase64(new byte[]{-125})); assertFalse(Base64.isBase64(new byte[]{-10})); assertFalse(Base64.isBase64(new byte[]{0})); assertFalse(Base64.isBase64(new byte[]{64, Byte.MAX_VALUE})); assertFalse(Base64.isBase64(new byte[]{Byte.MAX_VALUE})); assertTrue(Base64.isBase64(new byte[]{'A'})); assertFalse(Base64.isBase64(new byte[]{'A', Byte.MIN_VALUE})); assertTrue(Base64.isBase64(new byte[]{'A', 'Z', 'a'})); assertTrue(Base64.isBase64(new byte[]{'/', '=', '+'})); assertFalse(Base64.isBase64(new byte[]{'$'})); }