Remove faulty test

Sabre-Vobject 3.5 is more forgiving than 3.3 for which the test was created

plugins/libcalendaring/tests/libvcalendar.php

@@ -102,14 +102,6 @@ class libvcalendar_test extends PHPUnit_Framework_TestCase
         $this->assertFalse(array_key_exists('changed', $event), "No changed date field");
     }
 
-    function test_invalid_vevent()
-    {
-        $this->setExpectedException('\Sabre\VObject\ParseException');
-
-        $ical = new libvcalendar();
-        $events = $ical->import_from_file(__DIR__ . '/resources/invalid-event.ics', 'UTF-8', true);
-    }
-
     /**
      * Test some extended ical properties such as attendees, recurrence rules, alarms and attachments
      */

plugins/libcalendaring/tests/resources/invalid-event.ics

@@ -1,14 +0,0 @@
-BEGIN:VCALENDAR
-VERSION:2.0
-PRODID:-//Apple Inc.//iCal 5.0.3//EN
-CALSCALE:GREGORIAN
-BEGIN:VEVENT
-CREATED:20130917T000000Z
-LAST-MODIFIED:20130755
-UID:C968B885-08FB-40E5-B89E-6FA05F26AACC
-TRANSP:TRANSPARENT
-SUMMARY:Event with no end date nor duration
-DTSTART;VALUE=DATE-TIME:20131001T120000Z
-SEQUENCE:2
-END:VEVENT
-END:VCALENDAR