diff --git a/t/db_dependent/Koha/Plugins/Patron.t b/t/db_dependent/Koha/Plugins/Patron.t
index ebe4531b08..da5382b64d 100755
--- a/t/db_dependent/Koha/Plugins/Patron.t
+++ b/t/db_dependent/Koha/Plugins/Patron.t
@@ -16,8 +16,10 @@
 
 use Modern::Perl;
 
-use Test::More tests => 5;
+use Test::More tests => 6;
+use Test::NoWarnings;
 use Test::Exception;
+use Test::MockModule;
 
 use File::Basename;
 
@@ -51,6 +53,10 @@ subtest 'check_password hook tests' => sub {
     my $plugins = Koha::Plugins->new;
     $plugins->InstallPlugins;
 
+    # Mock patron_barcode_transform: we don't want to call it as it generates warnings
+    my $plugin_mock = Test::MockModule->new("Koha::Plugin::Test");
+    $plugin_mock->mock( "patron_barcode_transform", sub { } );
+
     # Test Plugin enforces a 4 digit numeric pin for passwords
     my $plugin = Koha::Plugin::Test->new->enable;