PHP Testing, for Procedural Code

Question

Is there any way of testing procedural code? I have been looking at PHPUnit which seems like a great way of creating automated tests. However, it seems to be geared towards object oriented code, are there any alternatives for procedural code?

Or should I convert the website to object oriented before attempting to test the website? This may take a while which is a bit of a problem as I don't have a lot of time to waste.

Thanks,

Daniel.

Answer 1

You can test procedural code with PHPUnit. Unit tests are not tied to object-oriented programming. They test units of code. In OO, a unit of code is a method. In procedural PHP, I guess it's a whole script (file).

While OO code is easier to maintain and to test, that doesn't mean procedural PHP cannot be tested.

Per example, you have this script:

simple_add.php

$arg1 = $_GET['arg1']; $arg2 = $_GET['arg2']; $return = (int)$arg1 + (int)$arg2; echo $return; 

You could test it like this:

class testSimple_add extends PHPUnit_Framework_TestCase {      private function _execute(array $params = array()) {         $_GET = $params;         ob_start();         include 'simple_add.php';         return ob_get_clean();     }      public function testSomething() {         $args = array('arg1'=>30, 'arg2'=>12);         $this->assertEquals(42, $this->_execute($args)); // passes          $args = array('arg1'=>-30, 'arg2'=>40);         $this->assertEquals(10, $this->_execute($args)); // passes          $args = array('arg1'=>-30);         $this->assertEquals(10, $this->_execute($args)); // fails     }  } 

For this example, I've declared an _execute method that accepts an array of GET parameters, capture the output and return it, instead of including and capturing over and over. I then compare the output using the regular assertions methods from PHPUnit.

Of course, the third assertion will fail (depends on error_reporting though), because the tested script will give an Undefined index error.

Of course, when testing, you should put error_reporting to E_ALL | E_STRICT.