### Question:
CharacterConverter implements AtlasConverter<Character> { @AtlasConversionInfo(sourceType = FieldType.CHAR, targetType = FieldType.STRING) public String toString(Character value, String sourceFormat, String targetFormat) { if (value == null) { return null; } return String.valueOf(value); }  @AtlasConversionInfo(sourceType = FieldType.CHAR, targetType = FieldType.DECIMAL) BigDecimal toBigDecimal(Character value); @AtlasConversionInfo(sourceType = FieldType.CHAR, targetType = FieldType.BIG_INTEGER) BigInteger toBigInteger(Character value); @AtlasConversionInfo(sourceType = FieldType.CHAR, targetType = FieldType.BOOLEAN, concerns = { AtlasConversionConcern.CONVENTION }) Boolean toBoolean(Character value, String sourceFormat, String targetFormat); @AtlasConversionInfo(sourceType = FieldType.CHAR, targetType = FieldType.BYTE, concerns = { AtlasConversionConcern.RANGE }) Byte toByte(Character value); @AtlasConversionInfo(sourceType = FieldType.CHAR, targetType = FieldType.CHAR) Character toCharacter(Character value); @AtlasConversionInfo(sourceType = FieldType.CHAR, targetType = FieldType.DOUBLE) Double toDouble(Character value); @AtlasConversionInfo(sourceType = FieldType.CHAR, targetType = FieldType.FLOAT) Float toFloat(Character value); @AtlasConversionInfo(sourceType = FieldType.CHAR, targetType = FieldType.INTEGER) Integer toInteger(Character value); @AtlasConversionInfo(sourceType = FieldType.CHAR, targetType = FieldType.LONG) Long toLong(Character value); @AtlasConversionInfo(sourceType = FieldType.CHAR, targetType = FieldType.NUMBER) Number toNumber(Character value); @AtlasConversionInfo(sourceType = FieldType.CHAR, targetType = FieldType.SHORT, concerns = { AtlasConversionConcern.RANGE, AtlasConversionConcern.CONVENTION }) Short toShort(Character value); @AtlasConversionInfo(sourceType = FieldType.CHAR, targetType = FieldType.STRING) String toString(Character value, String sourceFormat, String targetFormat);  }### Answer:
@Test public void convertToString() { Character c = Character.forDigit(0, 10); String s = converter.toString(c, null, null); assertNotNull(s); assertEquals("0", s); }
@Test public void convertToStringNull() { Character c = null; String s = converter.toString(c, null, null); assertNull(s); }