### Question:
ZonedDateTimeConverter implements TypeConverter { @Override public String toString(Type ignored, Object value) { return Objects.isNull(value) ? NULL_LITERAL : value.toString(); }  @Override boolean isApplicable(Type type); @Override ZonedDateTime fromString(Type ignored, String value); @Override String toString(Type ignored, Object value);  }### Answer:
@Test void shouldProperlyConvertToStringNull() { String converted = typeConverter.toString(ZonedDateTime.class, null); assertThat(converted).isEqualTo("@null"); }