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Debugging PHP
Creating the test class
The first step is the creation of AccountTester class as a subclass of TestCase class provided by PhpUnit.
The TestCase class has two methods, setUp and tearDown, that are interesting to us. Both methods have an
empty implementation in the TetsCase class and must be overridden in order to be used.
The setUp method is used for initialization stuff. In our case we used to initialize the sample accounts
used in our tests.The tearDown method is used for clean up stuff, we don't need it for our tests.
Our AccountTester class looks like this:
<?php
class AccountTester extends TestCase{
var $_ac1;
var $_ac2;
var $_ac3;
var $_ac4;
function AccountTester($name){
$this->TestCase($name); // call parent constructor
}
function setUp(){
// data for testWithdraw
$this->_ac1 = new Account(100);
// data for testDeposit
$this->_ac2 = new Account(20);
// data for testTransferFrom
$this->_ac3 = new Account(30);
$this->_ac4 = new Account(50);
}
}
?>
Adding Individual Tests
Now we must add our first test methods to AccountTester class.
<?php
// Make a withdrawal of 25 units from _ac1.
// _ac1's initial balance is 100
function testWithdraw(){
$this->_ac1->withdraw(25);
$this->assert($this->_ac1->getBalance() == 75); // 100 - 25 = 75
}
// Make a deposit of 10 units into _ac2.
// _ac1's initial balance is 20
function testDeposit(){
$this->_ac2->deposit(10);
$this->assertEquals(30,$this->_ac2->getBalance()); //20 +10 = 30
}
// Tranfers 10 units from _ac3 to _ac4
// _ac3's initial balance is 30
// _ac4's initial balance is 50
function testTransferFrom(){
$this->_ac4->transferFrom(&$this->_ac3,10);
$this->assertEquals(20,$this->_ac3->getBalance(),"Source account balance incorrect"); // 30 - 10 = 20
$this->assertEquals(60,$this->_ac4->getBalance(),"Target account balance incorrect"); // 50 + 10 = 60
}
?>
The key of the test is the assert method. If the expression inside the assert is true the test is
passed, otherwise an error as occurred.
A lot of asserts check for the equality of two values, for this reason the the TestCase class
has a assertEquals method. The assertEqual method has three parameters: the expected value, the
actual value, and a optional message to be printed if the test fails.
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| Comments: | ||
| Problem with PhpUnit | Shaji Mathew | 02/15/02 06:59 |
| "enhanced" phpunit | Adrian Kubala | 07/18/01 11:07 |
| RE: What if I don't know the result? | Oier Blasco | 06/13/01 01:50 |
| What about the Zend de bugger | Mooza | 05/25/01 13:04 |
| What if I don't know the result? | Ken Egervari | 04/12/01 06:03 |
| This WILL save you time and heartache | Adam Jeffery | 04/11/01 12:28 |
| PhpUnit.sourceforge.net now hosts PhpUnit cod | Fred Yankowski | 04/10/01 10:37 |
| see PhpUnit.sourceforge.net | Fred Yankowski | 04/09/01 19:31 |
| download of class TestCase | Daniel Hopp | 04/09/01 09:42 |
| followed the link but no joy | Darren Christie | 04/09/01 04:02 |
| This type of development is worth the time. | Robert Nickens | 04/07/01 11:04 |
|
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