Rerunning unit tests fails with DB error

[Dmitrii Metelkin]

On master.

When you rerun unit tests they fail with:

[DBG] 9d (lib/dml.php:157) postgres8 error: [-1: ERROR: cannot drop constraint tst_fram_id_pk on table tst_framework because other objects depend on it
[DBG] 9d (lib/dml.php:157) DETAIL: constraint tst_coll_fra_fk on table tst_collection depends on index tst_fram_id_pk
[DBG] 9d (lib/dml.php:157) HINT: Use DROP ... CASCADE to drop the dependent objects too.] in EXECUTE("ALTER TABLE tst_framework DROP CONSTRAINT tst_fram_id_pk")Command was: ALTER TABLE tst_framework DROP CONSTRAINT tst_fram_id_pk
[DBG] 9d (lib/dml.php:157) postgres8 error: [-1: ERROR: cannot drop table tst_framework because other objects depend on it
[DBG] 9d (lib/dml.php:157) DETAIL: constraint tst_coll_fra_fk on table tst_collection depends on table tst_framework
[DBG] 9d (lib/dml.php:157) HINT: Use DROP ... CASCADE to drop the dependent objects too.] in EXECUTE("DROP TABLE tst_framework")Command was: DROP TABLE tst_framework

This happens because we don't clean up coll_fra_fk index on {collection} table when uninstalling.
The proper fix would be to use the same set of functions for behat and unit tests when we drop a site.

[Mahara Bot (dev-mahara)]

Patch for "master" branch: https://reviews.mahara.org/8163

[Mahara Bot (dev-mahara)]

Reviewed: https://reviews.mahara.org/8163
Committed: https://git.mahara.org/mahara/mahara/commit/598db823a5abe206083b2086a4e086caaee0b392
Submitter: Robert Lyon (<email address hidden>)
Branch: master

commit 598db823a5abe206083b2086a4e086caaee0b392
Author: Dmitrii Metelkin <email address hidden>
Date: Thu Oct 19 16:57:17 2017 +1100

Bug 1723286: use TestingUtil::drop_database with PHPUnit tests

behatnotneeded

Change-Id: Ic42778ecf4c3c5bc90cbc81244a9744d405983fa