单元测试是几个现代敏捷开发方法的基础，使得PHPUnit成为许多大型PHP项目的关键工具。这个工具也可以被Xdebug扩展用来生成代码覆盖率报告 ，并且可以与phing集成来自动测试，最后它还可以和Selenium整合来完成大型的自动化集成测试。

Windows平台LAMP环境XAMPP 1.7.3下如何安装PHPUnit呢？

首先，以管理员身份运行cmd，使用pear添加phpunit频道：

D:\xampp\php>pear channel-discover pear.phpunit.de
Channel "pear.phpunit.de" is already initialized

频道添加好，尝试安装PHPUnit：

D:\xampp\php>pear install phpunit/PHPUnit
Unknown remote channel: pear.symfony-project.com
Unknown remote channel: pear.symfony-project.com
Unknown remote channel: components.ez.no
Unknown remote channel: components.ez.no
phpunit/PHPUnit requires PEAR Installer (version >= 1.9.1), installed version is 1.9.0
phpunit/PHPUnit requires package "channel://pear.symfony-project.com/YAML" (version >= 1.0.2)
phpunit/PHPUnit can optionally use PHP extension "dbus"
phpunit/DbUnit requires PEAR Installer (version >= 1.9.1), installed version is1.9.0
phpunit/DbUnit requires package "channel://pear.symfony-project.com/YAML" (version >= 1.0.2)
phpunit/File_Iterator requires PEAR Installer (version >= 1.9.1), installed version is 1.9.0
phpunit/PHP_CodeCoverage requires PEAR Installer (version >= 1.9.1), installed version is 1.9.0
phpunit/PHP_CodeCoverage requires package "channel://components.ez.no/ConsoleTools" (version >= 1.6)
phpunit/PHP_CodeCoverage requires package "phpunit/File_Iterator" (version >= 1.2.2)
phpunit/PHP_CodeCoverage can optionally use PHP extension "xdebug" (version >= 2.0.5)
phpunit/PHPUnit_MockObject requires PEAR Installer (version >= 1.9.1), installed version is 1.9.0
phpunit/PHPUnit_Selenium requires PEAR Installer (version >= 1.9.1), installed version is 1.9.0
phpunit/PHP_TokenStream requires PEAR Installer (version >= 1.9.1), installed version is 1.9.0
phpunit/PHP_TokenStream requires package "channel://components.ez.no/ConsoleTools" (version >= 1.6)
No valid packages found
install failed

从提示看出，需要安装PEAR 1.9.1，而当前PEAR是1.9.0，那就要先升级PEAR版本。

pear list-upgrades可以列出当前可用的更新，
D:\xampp\php>pear.bat list-upgrades
WARNING: channel "pear.php.net" has updated its protocols, use "pear channel-update pear.php.net" to
update

D:\xampp\php>pear channel-update pear.php.net
Updating channel "pear.php.net"
Update of Channel "pear.php.net" succeeded

D:\xampp\php>pear.bat list-upgrades
PEAR.PHP.NET AVAILABLE UPGRADES (STABLE):
=========================================
CHANNEL PACKAGE LOCAL REMOTE SIZE
pear.php.net Archive_Tar 1.3.3 (stable) 1.3.7 (stable) 17.2kB
pear.php.net Console_Getargs 1.3.4 (stable) 1.3.5 (stable) 17.8kB
pear.php.net Mail 1.1.14 (stable) 1.2.0 (stable) 23kB
pear.php.net Mail_Mime 1.5.2 (stable) 1.8.1 (stable) 31kB
pear.php.net Mail_mimeDecode 1.5.1 (stable) 1.5.5 (stable) 11.4kB
pear.php.net Net_SMTP 1.3.4 (stable) 1.4.4 (stable) 12.1kB
pear.php.net Net_Socket 1.0.9 (stable) 1.0.10 (stable) 5.3kB
pear.php.net PEAR 1.9.0 (stable) 1.9.1 (stable) 287kB
pear.php.net Structures_Graph 1.0.3 (stable) 1.0.4 (stable) 30kB
Channel pear.phpunit.de: No upgrades available
ZEND.GOOGLECODE.COM/SVN AVAILABLE UPGRADES (STABLE):
====================================================
CHANNEL PACKAGE LOCAL REMOTE SIZE
zend.googlecode.com/svn zend 1.9.6 (stable) 1.11.1 (stable) -

更新所有可用更新：
D:\xampp\php>pear upgrade-all
Will upgrade channel://pear.php.net/archive_tar
Will upgrade channel://pear.php.net/console_getargs
Will upgrade channel://pear.php.net/mail
Will upgrade channel://pear.php.net/mail_mime
Will upgrade channel://pear.php.net/mail_mimedecode
Will upgrade channel://pear.php.net/net_smtp
Will upgrade channel://pear.php.net/net_socket
Will upgrade channel://pear.php.net/pear
Will upgrade