@Test
    public void shouldFailToConvertNullTime() {
        assertThrows(DataException.class, () -> Values.convertToTime(null, null));
        assertThrows(DataException.class, () -> Values.convertToDate(null, null));
        assertThrows(DataException.class, () -> Values.convertToTimestamp(null, null));
    }
We can't infer or successfully parse into a different type, so this returns the same string.
connect/api/src/test/java/org/apache/kafka/connect/data/ValuesTest.java