Testing pretty much anything else

Now that we've got a good handle on using Mockery, then testing virtually anything else within our Laravel application should be a piece of cake, provided we've structured our application correctly.

If we're using dependency injection throughout our application, then in principle we should be able to mock any dependency required by any one class. That means we can produce a test like this:

<?php

namespace Tests\Services;

use Mockery as m;
use Tests\TestCase;
use App\Services\Invoicer;
use Mockery\Adapter\Phpunit\MockeryPHPUnitIntegration;

class InvoicerTest extends TestCase
{
    use MockeryPHPUnitIntegration;

    public function testCreateInvoice()
    {
        $repository = m::mock('App\Repositories\Order');
        $repository->shouldReceive('allUnpaid')->once()->andReturn([
            'id' => 1,
            'name' => 'Smethwick Systems',
        ]):
        $invoicer = new Invoicer($repository);
        $response = $invoicer->invoice();
        $this->assertCount(1, $response);
        $this->assertEquals(1, $response[0]->id);
        $this->assertEquals('Smethwick Systems', $response[0]->name);
    }
}

Here we're testing an Invoicer class that accepts an Order repository as its sole dependency in the constructor. We replace that dependency with a mock that expects the allUnpaid() method to be called and specifies the return value. Then we assert that the response from the invoicer is what we expect.