public function testDiff()
 {
     $this->field = mock('Tracker_FormElement_Field_Integer');
     $int_1 = new Tracker_Artifact_ChangesetValue_Integer(111, $this->field, false, 66);
     $int_2 = new Tracker_Artifact_ChangesetValue_Integer(111, $this->field, false, 666);
     $this->assertEqual($int_1->diff($int_2), 'changed from 666 to 66');
 }
 function testDiff()
 {
     $GLOBALS['Language']->setReturnValue('getText', 'changed from', array('plugin_tracker_artifact', 'changed_from'));
     $GLOBALS['Language']->setReturnValue('getText', 'to', array('plugin_tracker_artifact', 'to'));
     $field = new MockTracker_FormElement_Field_Integer();
     $int_1 = new Tracker_Artifact_ChangesetValue_Integer(111, $field, false, 66);
     $int_2 = new Tracker_Artifact_ChangesetValue_Integer(111, $field, false, 666);
     $this->assertEqual($int_1->diff($int_2), 'changed from 666 to 66');
 }