在上一篇我們把程式改為『依賴注入』的方式，最終的測試案例的程式碼為

<?php
// tests/PttCrawlerTest

namespace Recca0120\Ithome30\Tests;

use PHPUnit\Framework\TestCase;
use Recca0120\Ithome30\PttCrawler;
use Recca0120\Ithome30\HttpClient;

class PttCrawlerTest extends TestCase
{
    public function test_fetch_board_page()
    {
        $crawler = new PttCrawler(new FakeHttpClient());
        $records = $crawler->all();

        self::assertEquals([
            'name' => 'Gossiping',
            "nuser" => '12185',
            'class' => '綜合',
            'title' => '[八卦]不停重複今日公祭明日忘記',
        ], $records[0]);
    }
}

class FakeHttpClient extends HttpClient
{
    public function get()
    {
        return file_get_contents(__DIR__ . '/fixtures/ptt_home.html');
    }
}

雖然這樣的測試 code 已經算滿好理解了，但還是必須得再多出一個 FakeHttpClient 來輔助測試，總覺得不太舒服，這時我們就可以導入 Mockery 來讓我們的測試程式更為簡潔

安裝 Mockery

composer require --dev mockery/mockery

修改測試

<?php
// tests/PttCrawlerTest

namespace Recca0120\Ithome30\Tests;

use Mockery;
use PHPUnit\Framework\TestCase;
use Recca0120\Ithome30\HttpClient;
use Recca0120\Ithome30\PttCrawler;

class PttCrawlerTest extends TestCase
{
    public function test_fetch_board_page()
    {
        /**
         * 使用 Mockery::mock 直接建立一個假物件
         * @var Mockery\Mock|HttpClient $httpClient 
         */
        $httpClient = Mockery::mock(HttpClient::class);
        // 模擬 allows 來指定 HttpClient::get 並用 andReturn 回傳 html
        $httpClient
            ->allows('get')
            ->andReturn(file_get_contents(__DIR__ . '/fixtures/ptt_home.html'));

        $crawler = new PttCrawler($httpClient);
        $records = $crawler->all();

        self::assertEquals([
            'name' => 'Gossiping',
            "nuser" => '12185',
            'class' => '綜合',
            'title' => '[八卦]不停重複今日公祭明日忘記',
        ], $records[0]);
    }
}

再導入 Mockery 之後測試是不是就變的更容易閱讀了