using In memory database for laravel 5.5 - laravel-5

Question

I intend to use in memory database for unit testing in laravel...
I added this lines to phpunit.xml,
<php>
<env name="APP_ENV" value="testing"/>
<env name="CACHE_DRIVER" value="array"/>
<env name="SESSION_DRIVER" value="array"/>
<env name="QUEUE_DRIVER" value="sync"/>
<env name="DB_CONNECTION" value="sqlite" />
<env name="DB_DATABASE" value=":memory:" />
</php>
And this is my BookTest.php file inside \tests\Feature\BookTest.php directory,
<?php
namespace Tests\Feature;
use Tests\TestCase;
use Illuminate\Foundation\Testing\WithFaker;
use Illuminate\Foundation\Testing\RefreshDatabase;
use Illuminate\Foundation\Testing\DatabaseMigrations;
class BookTest extends TestCase
{
use DatabaseMigrations;
public function test_books_can_be_created()
{
$user = factory(\App\User::class)->create();
$book = $user->books()->create([
'name' => 'The hobbit',
'price' => 10
]);
$found_book = $book->find(1);
$this->assertEquals($found_book->name, 'The hobbit');
$this->assertEquals($found_book->price, 10);
}
}
But when we tried to add vendor\bin\phpunit I get,
1) Tests\Feature\BookTest::test_books_can_be_created
Illuminate\Database\QueryException: SQLSTATE[HY000]: General error: 1 no such table: books (SQL: insert into "books" ("name",
"price", "user_id", "updated_at", "created_at") values (The hobbit,
10, 1, 2018-03-23 08:52:26, 2018-03-23 08:52:26))
it would be great help if you can help me on how to use in memory database in laravel unit testing.

Answer 1

You should
use RefreshDatabase
so your test should look like this
<?php
namespace Tests\Feature;
use Tests\TestCase;
use Illuminate\Foundation\Testing\WithFaker;
use Illuminate\Foundation\Testing\RefreshDatabase;
class BookTest extends TestCase
{
use RefreshDatabase;
public function test_books_can_be_created()
{
$user = factory(\App\User::class)->create();
$book = $user->books()->create([
'name' => 'The hobbit',
'price' => 10
]);
$found_book = $book->find(1);
$this->assertEquals($found_book->name, 'The hobbit');
$this->assertEquals($found_book->price, 10);
}
}
source https://laravel.com/docs/5.5/database-testing#resetting-the-database-after-each-test