LoginTest.php

<?php

namespace Tests\Feature;

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

class LoginTest extends TestCase
{
    use RefreshDatabase;

    public function testLogin()
    {
        $user = factory(\App\User::class)->create();

        $response = $this->post('/login', [
            'email' => $user->email,
            'password' => 'secret'
        ]);

        $response->assertStatus(302)
            ->assertRedirect('/articles');
    }
}