Pro PHP- Patterns, Frameworks, Testing and More

CHAPTER 8 ■ TESTING, DEPLOYMENT, AND CONTINUOUS INTEGRATION^111

Creating Your First Unit Test

To get started creating your unit tests, you need to set up a directory structure. There is no

particular convention as to where to place your tests. Some developers keep their test files in

the same directory as the code being tested. Others create a separate tests directory and mirror

the code directory structure, which helps keep testing code separate. In this example, you will

use the latter approach.

First, clean up your Subversion file:

> svn rm index.html newfile.txt

D index.html

D newfile.txt

> svn commit

Deleting index.html

Deleting newfile.txt

Committed revision 5.

■Note Using svn rm will remove the file from the repository as well as the checkout upon svn commit.

A standard rm will not remove the file from the repository, and the file will be restored the next time you use

svn update.

Now create two directories, one for code and one for your tests:

> svn mkdir code tests

A code

A tests

In the code directory, create a Demo class that does something easily tested—addition and

subtraction—as shown in Listing 8-1.

Listing 8-1. A Demo Class (./code/Demo.php)

<?php

class Demo {

public function sum($a,$b) {

return $a+$b;

}

public function subtract($a,$b) {

return $a-$b;

}

}

Next, create a unit test, as shown in Listing 8-2.

McArthur_819-9C08.fm Page 111 Friday, February 22, 2008 9:06 AM