按照github网址中的步骤安装:
wget https://phar.phpunit.de/phpunit.phar
chmod +x phpunit.phar
mv phpunit.phar /usr/local/bin/phpunit 【把phpunit执行文件放到默认的执行文件中，ps：所搭建的php执行文件
也要放到默认的执行目录/usr/local/bin中，用短链接即可 ln -s /opt/lampp/bin/php /usr/local/bin 】
执行phpunit --version 有具体的信息，则表明安装成功。。
编写测试：
<?php//demo.phpclass
Demo { public function
sum($a,$b)
{ return $a+$b; } public function
subtract($a,$b) { return $a-$b; }}?><?php//
tests/demoTest.phprequire_once(dirname(__FILE__). ‘/../Demo.php‘);class
DemoTest extends
PHPUnit_Framework_TestCase { public function
setUp() { $this->demo =
new demo(); } public function
tearDown() { } public function
testSum() { $this->assertEquals(4,
$this->demo->sum(2, 2)); $this->assertNotEquals(3,
$this->demo->sum(1, 1)); } public function
testSubstract() { $this->assertEquals(0,
$this->demo->subtract(2,
2)); }}?>原文：http://www.cnblogs.com/paly76/p/3661755.html