### Question:
ConsumerRecord { @Deprecated public long checksum() { if (checksum == null) this.checksum = DefaultRecord.computePartialChecksum(timestamp, serializedKeySize, serializedValueSize); return this.checksum; } ConsumerRecord(String topic,
                          int partition,
                          long offset,
                          K key,
                          V value);  ConsumerRecord(String topic,
                          int partition,
                          long offset,
                          long timestamp,
                          TimestampType timestampType,
                          long checksum,
                          int serializedKeySize,
                          int serializedValueSize,
                          K key,
                          V value);  ConsumerRecord(String topic,
                          int partition,
                          long offset,
                          long timestamp,
                          TimestampType timestampType,
                          Long checksum,
                          int serializedKeySize,
                          int serializedValueSize,
                          K key,
                          V value,
                          Headers headers); String topic(); int partition(); Headers headers(); K key(); V value(); long offset(); long timestamp(); TimestampType timestampType(); @Deprecated long checksum(); int serializedKeySize(); int serializedValueSize(); @Override String toString(); static final long NO_TIMESTAMP; static final int NULL_SIZE; static final int NULL_CHECKSUM; }### Answer:
@Test @SuppressWarnings("deprecation") public void testNullChecksumInConstructor() { String key = "key"; String value = "value"; long timestamp = 242341324L; ConsumerRecord<String, String> record = new ConsumerRecord<>("topic", 0, 23L, timestamp, TimestampType.CREATE_TIME, null, key.length(), value.length(), key, value, new RecordHeaders()); assertEquals(DefaultRecord.computePartialChecksum(timestamp, key.length(), value.length()), record.checksum()); }