add function_checksum_is

[marco44]

Hi, As discussed in theory/tap-parser-sourcehandler-pgtap#18, here is a PR to add function_checksum_is

I didn't like joining to pg_proc, but couldn't find a better idea without extending tap_funky.

[cbandy]

I wonder... With pgTAP, shouldn't one be checking the behavior of a function?

This seems more like an audit rule than test assertion.

[theory]

Awesome, care to add some tests to test/sql/functap.sql?

[theory]

@cbandy pgTAP has no religion about the type of testing you do, but likes to give you the tools to do your testing well.

[marco44]

Took me a while, but here it is :)

[theory]

Look unhappy on Postgres 10. :-(

[marco44]

Yes but is seems to fail on partitions… which I didn't touch...

[nasbyj]

Please merge master; it has fixes for some bugs as well as much better test capabilities.

[nasbyj]

Also, this needs documentation.