### Question:
Base64 extends BaseNCodec { public static String encodeBase64String(final byte[] binaryData) { return StringUtils.newStringUtf8(encodeBase64(binaryData, false)); } 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 testRfc4648Section10Encode() { assertEquals("", Base64.encodeBase64String(StringUtils.getBytesUtf8(""))); assertEquals("Zg==", Base64.encodeBase64String(StringUtils.getBytesUtf8("f"))); assertEquals("Zm8=", Base64.encodeBase64String(StringUtils.getBytesUtf8("fo"))); assertEquals("Zm9v", Base64.encodeBase64String(StringUtils.getBytesUtf8("foo"))); assertEquals("Zm9vYg==", Base64.encodeBase64String(StringUtils.getBytesUtf8("foob"))); assertEquals("Zm9vYmE=", Base64.encodeBase64String(StringUtils.getBytesUtf8("fooba"))); assertEquals("Zm9vYmFy", Base64.encodeBase64String(StringUtils.getBytesUtf8("foobar"))); }