Add 'latest' query route

Should always refer to most recent job for the specified scenario.

* have the same link for test development, i.e. if one retriggers tests, the
person has to always update the URL. If there would be a static URL even the
browser can be instructed to reload the page automatically

* for linking to the always current execution of the last job within one
scenario, e.g. to respond faster to the standard question in bug reports "does
this bug still happen?"

lib/OpenQA/WebAPI.pm

@@ -297,6 +297,8 @@ sub startup {
 
     $r->get('/tests')->name('tests')->to('test#list');
     $r->get('/tests/overview')->name('tests_overview')->to('test#overview');
+    $r->get('/tests/latest')->name('latest')->to('test#latest');
+
     $r->get('/tests/export')->name('tests_export')->to('test#export');
     $r->post('/tests/list_ajax')->name('tests_ajax')->to('test#list_ajax');
     my $test_r = $r->route('/tests/:testid', testid => qr/\d+/);

lib/OpenQA/WebAPI/Controller/Test.pm

@@ -503,6 +503,19 @@ sub overview {
     );
 }
 
+sub latest {
+    my ($self) = @_;
+    my %search_args;
+    for my $arg (@scenario_keys) {
+        my $key = lc $arg;
+        next unless defined $self->param($key);
+        $search_args{$key} = $self->param($key);
+    }
+    my $job = $self->db->resultset("Jobs")->complex_query(%search_args)->first;
+    return $self->render(text => 'No matching job found', status => 404) unless $job;
+    return $self->redirect_to('test', testid => $job->id);
+}
+
 sub add_comment {
     my ($self) = @_;
 

t/ui/18-tests-details.t

@@ -80,6 +80,16 @@ is($num_active_tabs, 1, 'only one tab visible at the same time');
 my $href_to_isosize = $t->tx->res->dom->at('.component a[href*=installer_timezone]')->{href};
 $t->get_ok($baseurl . ($href_to_isosize =~ s@^/@@r))->status_is(200);
 
+subtest 'route to latest' => sub {
+    $get = $t->get_ok($baseurl . 'tests/latest?distri=opensuse&version=13.1&flavor=DVD&arch=x86_64&test=kde&machine=64bit')->status_is(302);
+    is($t->tx->res->headers->location, '/tests/99963', 'latest link shows tests/99963');
+    $get = $t->get_ok($baseurl . 'tests/latest?flavor=DVD&arch=x86_64&test=kde')->status_is(302);
+    is($t->tx->res->headers->location, '/tests/99963', '... as long as it is unique');
+    $get = $t->get_ok($baseurl . 'tests/latest?version=13.1')->status_is(302);
+    is($t->tx->res->headers->location, '/tests/99981', 'returns highest job nr of ambiguous group');
+    $get = $t->get_ok($baseurl . 'tests/latest?test=foobar')->status_is(404);
+};
+
 #print $driver->get_page_source();
 #t::ui::PhantomTest::make_screenshot('mojoResults.png');