Bug 16173: db_structure.t shouldn't have a fixed number of tests

This patch makes db_structure.t more flexible regarding how many tests are run.
This is important because it would fail on each db structure change, masking potential
real problems.

To test:
- Run
  $ prove t/db_dependent/db_structure.t
=> FAIL: the number of tests ran doesn't match what is expected
- Apply the patch
- Run
  $ prove t/db_dependent/db_structure.t
=> SUCCESS: Tests count is not an issue [1]
- Sign off

[1] Right now the tests run successfuly, they might fail if a real bug is introduced
on the DB structure, in the meantime.

Signed-off-by: Mark Tompsett <mtompset@hotmail.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>

Signed-off-by: Brendan A Gallagher <brendan@bywatersolutions.com>

t/db_dependent/db_structure.t

@@ -1,6 +1,23 @@
+#!/usr/bin/perl
+
+# This file is part of Koha.
+#
+# Koha is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# Koha is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Koha; if not, see <http://www.gnu.org/licenses>.
+
 use Modern::Perl;
 
-use Test::More tests => 409;
+use Test::More;
 use Koha::Database;
 
 my @modules = (
@@ -41,3 +58,7 @@ for my $modules ( @modules ) {
         }
     }
 }
+
+done_testing();
+
+1;