Bug 19821: Run tests on a separate database

Bug 19821: Run tests on a separate database

Running the tests on the same database as the one used for dev has some
drawbacks:
- Everybody has different data, so we cannot make any assumptions about
data in tests and it can make tests fail for non-obvious reasons.
- Tests have to clean up every change to the database using SQL
transactions, so we cannot write testable code that use transactions
(AFAIK)
- Transactions in tests happen to be committed sometimes, resulting in
garbage data added to the dev database

This patch provides a .proverc file that will load t/lib/Bootstrap.pm
before the tests are run.
t/lib/Bootstrap.pm is responsible for recreating a fresh database and
telling the test scripts to use it.
To use it, just run prove normally from the root directory of Koha.
By default, the database is 'koha_test' and it's created using MARC21
SQL files, it can be changed by running:

    prove --norc \
    --Mt::lib::Bootstrap=database,koha_test,marcflavour,UNIMARC

Test plan:
1. Apply bug 19185 which will also apply these patches
2. In the DBMS run `select count(*) from koha_kohadev.borrowers;`
     (adapt if your usual koha DB isn't koha_kohadev)
3. Run the test plan of bug 19185 and during execution of the
   installation test, pay attention to the following:
4. List the databases in the DBMS (show databases;) to ensure that
   koha_test is created
5. After the test has run, the koha_test database should not be here anymore.
6. In the DBMS run `select count(*) from koha_kohadev.borrowers;`
7. That was to verify that the database you use usually was untouched.
   The counts should be the same.

Signed-off-by: Jon Knight <J.P.Knight@lboro.ac.uk>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Bouzid Fergani <bouzid.fergani@inlibro.com>
Signed-off-by: Victor Grousset/tuxayo <victor@tuxayo.net>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>