Add tap tests on pgsodium objects schema

[ioguix]

This adds tap tests on the pgsodium extension itself. This should help enforce some sanity rules about ownership, privileges, existing objects, etc.

This is currently a draft as:

• it has been generated by the pgsodium_tapgen.pl perl script and needs some detailed review.
• it still requires some more tests

The generation script itself is included in this PR for information only. The objective is to edit the pgsodium_schema.sql test script bu hand.

[ioguix]

Note that the tests are currently failing because of #68

[ioguix]

Hi,

There's currently 1729 tests including the ones from commit f64f2cf.

We could add some more tests around indexes & constraints on table keys and about the event trigger (not supported by pgtap yet).

From here, I'll need some serious review, the next steps would be to:

• check all owners, privs, strictiness, security definers and so on
• fix them in the tests (turns the tests red)
• fix them in the code (turns the tests green)

Regards,

[ioguix]

Thank you!