Add a test for this behaviour

Author: vmcj

webapp/tests/Unit/Controller/Jury/ContestControllerTest.php

@@ -109,6 +109,14 @@ class ContestControllerTest extends JuryControllerTestCase
                                                            'endtimeString'        => '+10:00',
                                                            'unfreezetimeString'   => '+25:00',
                                                            'deactivatetimeString' => ''],
+                                                          ['shortname'            => 'dirfreezerelnoplus',
+                                                           'name'                 => 'Direct freeze minimal relative',
+                                                           'activatetimeString'   => '-0:00',
+                                                           'starttimeString'      => '2021-07-17 16:08:00 Europe/Amsterdam',
+                                                           'freezetimeString'     => '0:00',
+                                                           'endtimeString'        => '+10:00',
+                                                           'unfreezetimeString'   => '25:00',
+                                                           'deactivatetimeString' => ''],
                                                           ['shortname' => 'rel',
                                                            'name' => 'Relative contest',
                                                            'activatetimeString' => '-1:00',