### Question:
Base64 { public static byte[] encodeBase64(byte[] binaryData) { return new Base64().encode(binaryData); } Base64(); static boolean isBase64(byte octet); static String encodeBase64String(byte[] binaryData); static byte[] encodeBase64(byte[] binaryData); static byte[] decodeBase64(String base64String); static byte[] decodeBase64(byte[] base64Data); byte[] decode(String pArray); byte[] decode(byte[] pArray); byte[] encode(byte[] pArray);  }### Answer:
@Test public void testEncodeBase64EmptyArray() { byte[] emptyArray = new byte[0]; assertArrayEquals(emptyArray, Base64.encodeBase64(emptyArray)); }
@Test public void testEncodeBase64ByteArrayBooleanBooleanInt() { byte[] binaryData = new byte[]{(byte) '1', (byte) '2', (byte) '3'}; byte[] encoded = Base64.encodeBase64(binaryData); assertNotNull(encoded); assertEquals(4, encoded.length); }