### Question:
TokenBlobUtils { public String toUTF8(byte[] data) throws UnsupportedEncodingException { Reject.ifNull(data); return new String(data, ENCODING); }  String getBlobAsString(Token token); void setBlobFromString(Token token, String blob); String toUTF8(byte[] data); byte[] fromUTF8(String contents); static final String ENCODING; }### Answer:
@Test (expectedExceptions = NullPointerException.class) public void shouldNotAllowNullToConvert() throws UnsupportedEncodingException { utils.toUTF8(null); }