/**
  * test creating a Trail Relationship and then deleting it
  *
  * grabs the data from mySQL via getTrailRelationshipBySegmentIdAndTrailId
  **/
 public function testDeleteValidTrailRelationshipBySegmentIdAndTrailId()
 {
     // count the number of rows and save it for later
     $numRows = $this->getConnection()->getRowCount("trailRelationship");
     // create a new Trail Relationship and insert it into mySQL
     $trailRelationship = new TrailRelationship($this->segment->getSegmentId(), $this->trail->getTrailId(), $this->VALID_SEGMENTTYPE);
     $trailRelationship->insert($this->getPDO());
     // delete the Trail Relationship from mySQL
     $this->assertSame($numRows + 1, $this->getConnection()->getRowCount("trailRelationship"));
     $trailRelationship->delete($this->getPDO());
     //grab the data from my mySQL and enforce the Trail Relationship does not exist
     $pdoTrailRelationship = TrailRelationship::getTrailRelationshipBySegmentIdAndTrailId($this->getPDO(), $trailRelationship->getSegmentId(), $trailRelationship->getTrailId());
     $this->assertNull($pdoTrailRelationship);
     $this->assertSame($numRows, $this->getConnection()->getRowCount("trailRelationship"));
 }