### Question:
EntityTagConverter implements AttributeConverter<EntityTag,String> { @Override public String convertToDatabaseColumn(EntityTag attribute) { if(attribute==null) { return null; } return attribute.toString(); }  @Override String convertToDatabaseColumn(EntityTag attribute); @Override EntityTag convertToEntityAttribute(String dbData);  }### Answer:
@Test public void testConvertToDatabaseColumn() throws Exception { EntityTagConverter sut=new EntityTagConverter(); assertThat(sut.convertToDatabaseColumn(null),nullValue()); }