### Question:
BaseNCodec implements BinaryEncoder, BinaryDecoder { protected abstract boolean isInAlphabet(byte value); protected  BaseNCodec(final int unencodedBlockSize, final int encodedBlockSize,
                         final int lineLength, final int chunkSeparatorLength); protected  BaseNCodec(final int unencodedBlockSize, final int encodedBlockSize,
                         final int lineLength, final int chunkSeparatorLength, final byte pad); @Override Object encode(final Object obj); String encodeToString(final byte[] pArray); String encodeAsString(final byte[] pArray); @Override Object decode(final Object obj); byte[] decode(final String pArray); @Override byte[] decode(final byte[] pArray); @Override byte[] encode(final byte[] pArray); boolean isInAlphabet(final byte[] arrayOctet, final boolean allowWSPad); boolean isInAlphabet(final String basen); long getEncodedLength(final byte[] pArray); static final int MIME_CHUNK_SIZE; static final int PEM_CHUNK_SIZE; }### Answer:
@Test public void testIsInAlphabetByte() { assertFalse(codec.isInAlphabet((byte) 0)); assertFalse(codec.isInAlphabet((byte) 'a')); assertTrue(codec.isInAlphabet((byte) 'O')); assertTrue(codec.isInAlphabet((byte) 'K')); }
@Test public void testIsInAlphabetByteArrayBoolean() { assertTrue(codec.isInAlphabet(new byte[]{}, false)); assertTrue(codec.isInAlphabet(new byte[]{'O'}, false)); assertFalse(codec.isInAlphabet(new byte[]{'O',' '}, false)); assertFalse(codec.isInAlphabet(new byte[]{' '}, false)); assertTrue(codec.isInAlphabet(new byte[]{}, true)); assertTrue(codec.isInAlphabet(new byte[]{'O'}, true)); assertTrue(codec.isInAlphabet(new byte[]{'O',' '}, true)); assertTrue(codec.isInAlphabet(new byte[]{' '}, true)); }
@Test public void testIsInAlphabetString() { assertTrue(codec.isInAlphabet("OK")); assertTrue(codec.isInAlphabet("O=K= \t\n\r")); }