flink-connector-test-util/src/main/java/com/ververica/cdc/connectors/utils/AssertUtils.java
public static void assertTombstone(SourceRecord record) {
        assertNotNull(record.key());
        assertNotNull(record.keySchema());
        assertNull(record.value());
        assertNull(record.valueSchema());
    }
/**
     * Verify that the given {@link SourceRecord} is a valid tombstone, meaning it has a non-null
     * key and key schema but null value and value schema.
     *
     * @param record the source record; may not be null
     */
Verify that the given  SourceRecord is a valid tombstone, meaning it has a non-null
key and key schema but null value and value schema.

@param record the source record; may not be null
Verify that the given SourceRecord is a valid tombstone meaning it has a non - null key and key schema but null value and value schema . @param record the source record ; may not be null
public static void assertTombstone(SourceRecord record) {
        assertNotNull(record.key());
        assertNotNull(record.keySchema());
        assertNull(record.value());
        assertNull(record.valueSchema());
    }
public static void assertTombstone ( SourceRecord record ) { assertNotNull ( record . key ( ) ) ; assertNotNull ( record . keySchema ( ) ) ; assertNull ( record . value ( ) ) ; assertNull ( record . valueSchema ( ) ) ; }
Verify that the given {@link SourceRecord} is a valid tombstone, meaning it has a non-null
 key and key schema but null value and value schema.
Verify that the given { @link SourceRecord } is a valid tombstone meaning it has a non - null key and key schema but null value and value schema .