First table sync: it should be simply just copied to the destination
NOTICE:  INSERTED 4 row(s)

Next table sync: there shall be no changes
NOTICE:  relation "test_sync_dest" already exists, skipping
NOTICE:  DELETED 0 row(s)
NOTICE:  INSERTED 0 row(s)
NOTICE:  MODIFIED 0 row(s)

Remove a row from the source and check it is deleted from the dest table
DELETE 1
NOTICE:  relation "test_sync_dest" already exists, skipping
NOTICE:  DELETED 1 row(s)
NOTICE:  INSERTED 0 row(s)
NOTICE:  MODIFIED 0 row(s)

Insert a new row and check that it is inserted in the dest table
INSERT 0 1
NOTICE:  relation "test_sync_dest" already exists, skipping
NOTICE:  DELETED 0 row(s)
NOTICE:  INSERTED 1 row(s)
NOTICE:  MODIFIED 0 row(s)

Modify row and check that it is modified in the dest table
UPDATE 1
NOTICE:  relation "test_sync_dest" already exists, skipping
NOTICE:  DELETED 0 row(s)
NOTICE:  INSERTED 0 row(s)
NOTICE:  MODIFIED 1 row(s)

Sanity check: the end result is the same source table
1|1|1|foo
2|2|2|bar
4|4|4|cantaloupe
5|5|5|sandia
1|1|1|foo
2|2|2|bar
4|4|4|cantaloupe
5|5|5|sandia
ROLLBACK