Laravel 5.5 PHPunit测试- "A facade root has not been set."

Question

当我对DB::Connection()->getPdo();进行try/catch时，出现错误。尚未设置外观根。 ，我相信在尝试添加try/catch之前，Schema外观也会发生这种情况。当然，tests目录位于app目录之外，我觉得它与此有关，但是我没有成功地将其弄清楚。

这是发生这种情况的测试类:

<?php

namespace Tests\Models;

use Illuminate\Support\Facades\Schema;
use Illuminate\Support\Facades\DB;
use App\Models\Discussion;
use App\User;
use Business\Database\Model;
use Illuminate\Database\Schema\Blueprint;
use Tests\TestCase;

class DiscussionModelTest extends TestCase
{
    /**
     * Create the tables this model needs for testing.
     */
    public static function setUpBeforeClass()
    {
        try {
            DB::connection()->getPdo();
        } catch(\Exception $e) {
            die($e->getMessage());
        }

        Schema::create('discussions', function (Blueprint $table) {
            $table->integer('id');
            $table->integer('user_id');

            $table->foreign('user_id')->references('id')->on('users');
        });

        Schema::create('users', function (Blueprint $table) {
            $table->integer('id');
        });
    }
}

Answer 1

问题是您无法在setUpBeforeClass中执行此操作，因为许多事情都是在setUp方法中运行的。如果查看this order of run，您将看到setUpBeforeClass在setUp方法之前运行，并且TestCase类在setUp方法中做了很多事情。看起来像这样:

protected function setUp()
{
    if (! $this->app) {
        $this->refreshApplication();
    }

    $this->setUpTraits();

    foreach ($this->afterApplicationCreatedCallbacks as $callback) {
        call_user_func($callback);
    }

    Facade::clearResolvedInstances();

    Model::setEventDispatcher($this->app['events']);

    $this->setUpHasRun = true;
}

因此，您应该使用自己的实现创建自己的 setUp和 tearDown方法，如下所示:

protected function setUp()
{
   parent::setUp();
   // your code goes here
}

protected function tearDown()
{
   parent::tearDown();
   // your code goes here
}