Pro PHP- Patterns, Frameworks, Testing and More

CHAPTER 8 ■ TESTING, DEPLOYMENT, AND CONTINUOUS INTEGRATION^113

> phpunit DemoTest

PHPUnit 3.1.9 by Sebastian Bergmann.

F

Time: 0 seconds

There was 1 failure:

1) testSum(DemoTest)

Failed asserting that <integer:0> matches expected value <integer:4>.

/home/user/myfirstrepo/tests/DemoTest.php:12

FAILURES!

Tests: 1, Failures: 1.

The test failed because the sum() method no longer passes your equality assertion that

2 + 2 = 4.

You can choose from literally dozens of assertions. In the example, you used assertEquals

and assertNotEquals, both of which take two items to compare. There are also assertions like

assertSame for objects, assertTrue or assertFalse for Booleans, and setExpectedException for

exceptions. For a reference list and exact syntax details, see the PHPUnit manual at http://

http://www.phpunit.de.

When writing unit tests, you will need to set up your objects, as when you assigned $demo = new

Demo() in the previous test. This can become tedious if you are always doing the same setup for

each test. Fortunately, PHPUnit provides two methods, called setUp() and tearDown(), which

allow you to define a common configuration for every test. Listing 8-3 shows the same test,

split into setUp() and tearDown() methods.

Listing 8-3. A Test Split into setUp and tearDown Methods (./tests/DemoTest.php)

<?php

require_once('PHPUnit/Framework.php');

require_once(dirname(__FILE__). '/../code/Demo.php');

class DemoTest extends PHPUnit_Framework_TestCase {

public function setUp() {

$this->demo = new Demo();

}

public function testSum() {

$this->assertEquals(4,$this->demo->sum(2,2));

}

public function testSubstract() {

$this->assertEquals(0,$this->demo->subtract(2,2));

}

public function tearDown() {

unset($this->demo);

}

}

McArthur_819-9C08.fm Page 113 Friday, February 22, 2008 9:06 AM