Ubuntu 怎样安装phpunit

安装方法：

pear upgrade PEAR
sudo pear channel-discover pear.phpunit.de
sudo pear install --alldeps phpunit/PHPUnitpear help
pear install phpunit/PHPUnit_Selenium
pear list phpunit

测试程序

目标程序 ：Demo.php
<?php
class Demo {
    public function sum($a,$b) {
        return $a+$b;
    }
    public function subtract($a,$b){
        return $a-$b;
    }
}

用例程序 : DemoTest.php 
<?php
    require ('./Demo.php');

    class DemoTest extends PHPUnit_Framework_TestCase {
        public function testSum() {
            $demo = new Demo();
            $this->assertEquals(4,$demo->sum(2,2));
            $this->assertNotEquals(2,$demo->sum(3,1));
        }
    }