/**
  * test isObsoletedBy
  * => same event does not obsolete each other
  */
 public function testIsObsoletedBy()
 {
     $event1 = new Calendar_Model_Event(array('seq' => 2, 'last_modified_time' => new Tinebase_DateTime('2011-11-23 14:25:00')));
     $event2 = new Calendar_Model_Event(array('seq' => '3', 'last_modified_time' => new Tinebase_DateTime('2011-11-23 14:26:00')));
     $this->assertTrue($event1->isObsoletedBy($event2), 'failed by seq');
     $event1->seq = 3;
     $this->assertTrue($event1->isObsoletedBy($event2), 'failed by modified');
     $event1->last_modified_time = clone $event2->last_modified_time;
     $this->assertFalse($event1->isObsoletedBy($event2), 'failed same');
 }