public function testGetDobFromAge() { //10 years $dob = Interfacer::getDobFromAge('3652', '2015-03-04'); $this->assertEquals('2005-03-04', $dob); //1 day $dob = Interfacer::getDobFromAge('1', '2015-03-04'); $this->assertEquals('2015-03-03', $dob); //100 days $dob = Interfacer::getDobFromAge('100', '2015-03-04'); $this->assertEquals('2014-11-24', $dob); }