安装相关插件
https://github.com/sempro/phpunit-pretty-print

composer require sempro/phpunit-pretty-print --dev

修改phpunit.xml为如下

<?xml version="1.0" encoding="UTF-8"?>
<phpunit backupGlobals="false"
         backupStaticAttributes="false"
         bootstrap="vendor/autoload.php"
         colors="true"
         convertErrorsToExceptions="true"
         convertNoticesToExceptions="true"
         convertWarningsToExceptions="true"
         processIsolation="false"
         stopOnFailure="false">
    <testsuites>
        <testsuite name="Unit">
            <directory suffix="Test.php">./tests/Unit</directory>
        </testsuite>

        <testsuite name="Feature">
            <directory suffix="Test.php">./tests/Feature</directory>
        </testsuite>
    </testsuites>
    <filter>
        <whitelist processUncoveredFilesFromWhitelist="true">
            <directory suffix=".php">./app</directory>
        </whitelist>
    </filter>
    <php>
        <env name="APP_ENV" value="testing"/>
        <env name="BCRYPT_ROUNDS" value="4"/>
        <env name="DB_CONNECTION" value="sqlite"/>
        <env name="DB_DATABASE" value=":memory:"/>
        <env name="CACHE_DRIVER" value="array"/>
        <env name="SESSION_DRIVER" value="array"/>
        <env name="QUEUE_DRIVER" value="sync"/>
        <env name="MAIL_DRIVER" value="array"/>
    </php>
</phpunit>

试着运行一下

➜  blog.dock.com phpunit
PHPUnit 7.4.3 by Sebastian Bergmann and contributors.


Tests\Unit\ExampleTest
  ✓ basic test [0.635s]

Tests\Feature\ExampleTest
  ✓ basic test [0.265s]


Time: 1.39 seconds, Memory: 14.00MB

OK (2 tests, 2 assertions)

so cool
接下来开始真正的测试吧
parent::setUp();必不可少，防止父方法被覆盖

<?php

namespace Tests\Feature;

use Illuminate\Foundation\Testing\DatabaseMigrations;
use Tests\TestCase;
use Illuminate\Foundation\Testing\WithFaker;
use Illuminate\Foundation\Testing\RefreshDatabase;

class ThreadTest extends TestCase
{
    use DatabaseMigrations;

    protected $thread;

    public function setUp()
    {
        parent::setUp();
        $this->thread = factory(\App\Models\Thread::class)->create();
    }
    /**
     * 用户可以看见所有帖子
     * @test
     * @return void
     */
    public function user_can_view_all_threads()
    {
        $response = $this->get('/threads');
        $response->assertStatus(200);
        $response->assertSee($this->thread->title);
    }

    /**
     * 用户可以看见帖子详情页
     * @test
     * @return void
     */
    public function user_can_view_an_thread()
    {
        $response = $this->get($this->thread->path());
        $response->assertStatus(200);
        $response->assertSee($this->thread->title);
    }

}

测试 失败 挖坑待填

➜  blog.dock.com phpunit
PHPUnit 7.4.3 by Sebastian Bergmann and contributors.

Tests\Feature\ThreadTest
  x user can view all threads [0.024s]
  x user can view an thread [0.000s]

开始修复问题 填坑
增加如下两行route

Route::get('/threads', 'ThreadController@index');
Route::get('/threads/{thread}', 'ThreadController@show')

model增加path方法

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class Thread extends Model
{
    //
    public function path()
    {
        return '/threads/'.$this->id;
    }
}

控制器 查看所有 index方法

public function index()
{
        //
        $threads = Thread::latest()->get();

        return view('threads.index', compact('threads'));
 }

相关视图文件

@extends('layouts.app')

@section('content')
<div class="container">
    <div class="row justify-content-center">
        <div class="col-md-8">
            <div class="card">
                <div class="card-header">Forum Threads</div>

                <div class="card-body">
                    @foreach ($threads as $thread)
                        <article>
                            <h4><a href="{{ $thread->path() }}" target="_blank">{{ $thread->title }}</a></h4>
                            <div class="body">{{ $thread->body }}</div>
                        </article>
                        <hr>
                    @endforeach
                </div>
            </div>
        </div>
    </div>
</div>
@endsection

测试通过

➜  blog.dock.com phpunit
PHPUnit 7.4.3 by Sebastian Bergmann and contributors.

Tests\Feature\ThreadTest
  ✓ user can view all threads [0.752s]
  x user can view an thread [0.113s]

处理查看单个详情页

 public function show(Thread $thread)
    {
        //
        return view('threads.show', compact('thread'));
    }

相关的视图代码

@extends('layouts.app')

@section('content')
    <div class="container">
        <div class="row justify-content-center">
            <div class="col-md-8">
                <div class="card">
                    <div class="card-header">Some Thread</div>

                    <div class="card-body">
                            <article>
                                <h4>{{ $thread->title }}</h4>
                                <div class="body">{{ $thread->body }}</div>
                            </article>
                            <hr>
                    </div>
                </div>
            </div>
        </div>
    </div>
@endsection

测试通过，大功告成！

Tests\Feature\ThreadTest
  ✓ user can view all threads [0.660s]
  ✓ user can view an thread [0.112s]