Learn Middleware Test

LearnMiddlewareTest.php

<?php

namespace Tests\Feature;

use App\Http\Middleware\LearnUnitTestMiddleware;
use Tests\TestCase;
use Illuminate\Http\Request;
use Illuminate\Http\Response;
use Mockery;

class LearnMiddlewareTest extends TestCase
{
    /** @test */
    public function the_learn_middleware_works()
    {
    	// Create mock response
        $response = Mockery::Mock(Response::class);
        // Create request on the fly
        $request  = Request::create('/', 'GET');
        // Assert that the current request no input yet
        $this->assertEmpty($request->input());
        // Create a new middleware object and call `handle()` method. 
        // Pass the `$request`, together with `$response`
        // What it does basically to pass the request to middleware
        // to process the request.
        (new LearnUnitTestMiddleware())
            ->handle(
                $request,
                function () use ($response) {
                    return $response;
                }
            );
        // After it's being handle by middleware,
        // we want to check either the $request->input()
        // is injected with new parameters.
        // So we simply assert not empty
        $this->assertNotEmpty($request->input());
        // And explicit check the $request->input() contained
        // ['learn' => true], which injected in the middleware.
        $this->assertContains(['learn' => true], $request->input());
    }
}