function testFieldDateShouldSendEmptyMailWhenThereIsNoDateDefined()
 {
     $user = mock('PFUser');
     $artifact = new MockTracker_Artifact();
     $date = new Tracker_FormElement_Field_DateTestVersion();
     $value = new MockTracker_Artifact_ChangesetValue_Date();
     $value->setReturnValue('getTimestamp', 0);
     $this->assertEqual('-', $date->fetchMailArtifactValue($artifact, $user, $value, 'text'));
     $this->assertEqual('-', $date->fetchMailArtifactValue($artifact, $user, $value, 'html'));
 }