diff --git a/lib/OpenQA/Schema.pm b/lib/OpenQA/Schema.pm
index 3cc3e8ad7e9..e5c6283dd85 100644
--- a/lib/OpenQA/Schema.pm
+++ b/lib/OpenQA/Schema.pm
@@ -51,11 +51,6 @@ sub disconnect_db () {
     $SINGLETON = undef;
 }
 
-sub dsn {
-    my $self = shift;
-    return $self->storage->connect_info->[0]->{dsn};
-}
-
 sub deploy ($self, $force_overwrite = 0) {
     # lock config file to ensure only one thing will deploy/upgrade DB at once
     # we use a file in prjdir/db as the lock file as the install process and
diff --git a/lib/OpenQA/Shared/Plugin/Gru.pm b/lib/OpenQA/Shared/Plugin/Gru.pm
index ae2625e41e4..05c9df14dba 100644
--- a/lib/OpenQA/Shared/Plugin/Gru.pm
+++ b/lib/OpenQA/Shared/Plugin/Gru.pm
@@ -40,18 +40,31 @@ sub register_tasks ($self) {
       );
 }
 
+# allow the continuously polled stats to be available on an
+# unauthenticated route to prevent recurring broken requests to the login
+# provider if not logged in
+#
+# hard/impossible to mock due to name collision of "remove" method on
+# Test::MockObject, hence marking as
+# uncoverable statement
+sub _allow_unauthenticated_minion_stats ($app) {
+    my $route = $app->routes->find('minion_stats')->remove;    # uncoverable statement
+    $app->routes->any('/minion')->add_child($route);    # uncoverable statement
+}
+
 sub register ($self, $app, $config) {
     $self->app($app) unless $self->app;
     my $schema = $app->schema;
 
     my $conn = Mojo::Pg->new;
-    if (ref $schema->storage->connect_info->[0] eq 'HASH') {
-        $self->dsn($schema->dsn);
-        $conn->username($schema->storage->connect_info->[0]->{user});
-        $conn->password($schema->storage->connect_info->[0]->{password});
+    my $connect_info = $schema->storage->connect_info->[0];
+    if (ref $connect_info eq 'HASH') {
+        $self->dsn($connect_info->{dsn});
+        $conn->username($connect_info->{user});
+        $conn->password($connect_info->{password});
     }
     else {
-        $self->dsn($schema->storage->connect_info->[0]);
+        $self->dsn($connect_info);
     }
     $conn->dsn($self->dsn());
 
@@ -82,12 +95,7 @@ sub register ($self, $app, $config) {
     # Enable the Minion Admin interface under /minion
     my $auth = $app->routes->under('/minion')->to('session#ensure_admin');
     $app->plugin('Minion::Admin' => {route => $auth});
-    # allow the continuously polled stats to be available on an
-    # unauthenticated route to prevent recurring broken requests to the login
-    # provider if not logged in
-    my $route = $app->routes->find('minion_stats')->remove;
-    $app->routes->any('/minion')->add_child($route);
-
+    _allow_unauthenticated_minion_stats($app);
     my $gru = OpenQA::Shared::Plugin::Gru->new($app);
     $app->helper(gru => sub ($c) { $gru });
 }
diff --git a/t/15-shared-plugin-gru.t b/t/15-shared-plugin-gru.t
new file mode 100644
index 00000000000..ecd063d9da1
--- /dev/null
+++ b/t/15-shared-plugin-gru.t
@@ -0,0 +1,41 @@
+#!/usr/bin/env perl
+# Copyright SUSE LLC
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+use Test::Most;
+
+use Test::Warnings ':report_warnings';
+use Test::MockModule;
+use Test::MockObject;
+use FindBin;
+use lib "$FindBin::Bin/lib", "$FindBin::Bin/../external/os-autoinst-common/lib";
+use OpenQA::Test::TimeLimit '5';
+use OpenQA::App;
+use OpenQA::Shared::Plugin::Gru;    # SUT
+
+ok my $gru = OpenQA::Shared::Plugin::Gru->new, 'can instantiate gru plugin';
+
+my $connect_info = {dsn => 'my_dsn', user => 'user', password => 'foo'};
+my $storage = Test::MockObject->new->set_always(connect_info => [$connect_info]);
+my $schema = Test::MockObject->new->set_always(storage => $storage)->set_true('search_path_for_tests');
+my %config = (misc_limits => {minion_job_max_age => 0});
+my $minion = Test::MockObject->new->set_true('on');
+my $log = Test::MockObject->new->set_true('level', 'info');
+my $under = Test::MockObject->new->set_true('to');
+my $routes = Test::MockObject->new->set_always(under => $under);
+my $app
+  = Test::MockObject->new->set_always(schema => $schema)->set_always(config => \%config)->set_always(minion => $minion)
+  ->set_always(log => $log)->set_always(routes => $routes)->set_true('plugin', 'helper');
+OpenQA::App->set_singleton($app);
+my $mock = Test::MockModule->new('OpenQA::Shared::Plugin::Gru');
+$mock->noop('_allow_unauthenticated_minion_stats');
+my $pg = Test::MockObject->new->set_true('dsn', 'username', 'password', 'search_path', 'find');
+my $pg_module = Test::MockModule->new('Mojo::Pg')->redefine(new => $pg);
+ok $gru->register($app, undef), 'can register gru plugin';
+$pg->called_ok('username', 'pg connection initialized with username');
+is(($pg->call_args(0))[1], $connect_info->{user}, 'pg connection username is correct');
+is(($pg->call_args(2))[1], $connect_info->{password}, 'pg connection password is correct');
+is(($app->call_args(4))[1], 'Minion', 'minion initialized');
+is(($app->call_args(4))[2]->{Pg}, $pg, 'pg connection initialized on minion');
+
+done_testing;