$this->assertEquals($output['dimensions']['width'],$input['dimensions']['width'],sprintf('Computed width (%s) does not equal expected width (%s)',$output['dimensions']['width'],$input['dimensions']['width']));
// Check the height.
$this->assertEquals($output['dimensions']['height'],$input['dimensions']['height'],sprintf('Computed height (%s) does not equal expected height (%s)',$output['dimensions']['height'],$input['dimensions']['height']));