Bug 12738: (regression tests) C4::Context should set keyword search as default for QueryParser

This patch introduces tests for the QueryParser PQF driver usage in Koha. Specifically its
initialization on C4::Context, and initial setup.

It also introduces a .pl script that is used to load C4::Context with different hash randomization
seeds on purpose, to verify the initialization result is deterministic and consistent between
runs.

To test:
  $ prove -v t/db_dependent/QueryParser.t

It should fail because different default_search_class is set on each run, and it is not often the
one we expect.

Sponsored-by: Universidad Nacional de Cordoba
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>

t/db_dependent/QueryParser.t

@@ -0,0 +1,70 @@
+#!/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 => 7;
+
+use File::Basename;
+use C4::Context;
+
+C4::Context->set_preference( "UseQueryParser", 1 );
+my $QParser = C4::Context->queryparser();
+
+# Check initialization correctly parsed the config file
+ok( defined $QParser && ref($QParser) eq "Koha::QueryParser::Driver::PQF"
+    , 'C4::Context successfully created a QP object' );
+
+is( $QParser->search_class_count, 4,
+    "Initialized 4 search classes" );
+is( scalar(@{$QParser->search_fields()->{'keyword'}}), 111,
+    "Correct number of search fields for 'keyword' class");
+is( scalar(@{$QParser->search_fields()->{'author'}}), 5,
+    "Correct number of search fields for 'author' class");
+is( scalar(@{$QParser->search_fields()->{'subject'}}), 12,
+    "Correct number of search fields for 'subject' class");
+is( scalar(@{$QParser->search_fields()->{'title'}}), 5,
+    "Correct number of search fields for 'title' class");
+
+# Load C4::Context 4 times with different randomization seeds
+$ENV{ PERL_PERTURB_KEYS } = "1";
+my $hash_seed = "AB123";
+my $default_search_class1 = get_default_search_class();
+$hash_seed = "CD456";
+my $default_search_class2 = get_default_search_class();
+$hash_seed = "ABCDE";
+my $default_search_class3 = get_default_search_class();
+$hash_seed = "123456";
+my $default_search_class4 = get_default_search_class();
+
+ok( $default_search_class1 eq 'keyword' &&
+    $default_search_class2 eq 'keyword' &&
+    $default_search_class3 eq 'keyword' &&
+    $default_search_class4 eq 'keyword',
+    "C4::Context correctly sets the default search class to 'keyword' (Bug 12738)");
+
+sub get_default_search_class {
+    # get the default search class from a forked proccess
+    # that just loads C4::Context
+    $ENV{ PERL_HASH_SEED }    = $hash_seed;
+    my $running_dir = dirname(__FILE__);
+    my $default_search_class = qx/$running_dir\/default_search_class.pl/;
+
+    return $default_search_class;
+}
+
+1;

t/db_dependent/default_search_class.pl

@@ -0,0 +1,36 @@
+#!/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;
+
+=head1 default_search_class.pl
+
+The only purpose of this script is to load C4::Context and print
+the default search class from the QueryParser object
+
+=cut
+
+use C4::Context;
+
+C4::Context->set_preference("UseQueryParser","1");
+
+my $QParser = C4::Context->queryparser();
+my $default_search_class = $QParser->default_search_class();
+
+print $default_search_class;
+
+exit 0;