### Question:
CharTag { public String getTLV() { int vLen = 0; if (value != null) vLen = value.length(); String length = ISOUtil.zeropad(vLen, lengthSize); String tlv; if (swapTagWithLength) tlv = length + tagId; else tlv = tagId + length; if (vLen == 0) return tlv; return tlv + value; } protected  CharTag(String tagId, String value); String getTLV(); String getTagId(); String getValue(); @Override String toString();  }### Answer:
@Test void testTLVNullValue() { instance = tagMap.createTLV("02", null); assertEquals("02000", instance.getTLV()); }