php/test/payment/page/ClientTest.php
<?php

use Alipay\EasySDK\Kernel\Factory;
use Alipay\EasySDK\Test\TestAccount;
use PHPUnit\Framework\TestCase;

class ClientTest extends TestCase
{
    public function __construct($name = null, array $data = [], $dataName = '')
    {
        parent::__construct($name, $data, $dataName);
        $account = new TestAccount();
        Factory::setOptions($account->getTestAccount());
    }

    public function testPay()
    {
        $create = Factory::payment()->common()->create("Iphone6 16G",
            microtime(), "88.88", "2088002656718920");
        $result = Factory::payment()->page()->pay("Iphone6 16G", $create->outTradeNo, "0.10", "https://www.taobao.com");
        $this->assertEquals(true, strpos($result->body, 'alipay-easysdk-php-') > 0);
        $this->assertEquals(true, strpos($result->body, 'sign') > 0);
    }

    public function testPayWithOptionalNotify()
    {
        $create = Factory::payment()->common()->create("Iphone6 16G",
            microtime(), "88.88", "2088002656718920");
        $result = Factory::payment()->page()
            ->asyncNotify("https://www.test2.com/newCallback")
            ->pay("Iphone6 16G", $create->outTradeNo, "0.10", "https://www.taobao.com");
        $this->assertEquals(true, strpos($result->body, 'alipay-easysdk-php-') > 0);
        $this->assertEquals(true, strpos($result->body, 'sign') > 0);
    }

}