2.4 - Faking the Payment Gateway

app/Billing/FakePaymentGateway.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace App\Billing;
+
+class FakePaymentGateway implements PaymentGateway
+{
+    private $charges;
+
+    public function __construct()
+    {
+        $this->charges = collect();
+    }
+
+    public function getValidTestToken()
+    {
+        return "valid-token";
+    }
+
+    public function charge($amount, $token)
+    {
+        $this->charges[] = $amount;
+    }
+
+    public function totalCharges()
+    {
+        return $this->charges->sum();
+    }
+}

app/Billing/PaymentGateway.php

@@ -0,0 +1,8 @@
+<?php
+
+namespace App\Billing;
+
+interface PaymentGateway
+{
+    public function charge($amount, $token);
+}

app/Exceptions/Handler.php

@@ -44,6 +44,7 @@ class Handler extends ExceptionHandler
      */
     public function render($request, Exception $exception)
     {
+        throw $exception;
         return parent::render($request, $exception);
     }
 

app/Http/Controllers/ConcertOrdersController.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace App\Http\Controllers;
+
+use App\Concert;
+use Illuminate\Http\Request;
+use App\Billing\PaymentGateway;
+
+class ConcertOrdersController extends Controller
+{
+    private $paymentGateway;
+
+    public function __construct(PaymentGateway $paymentGateway)
+    {
+        $this->paymentGateway = $paymentGateway;
+    }
+
+    public function store($concertId)
+    {
+        $concert = Concert::find($concertId);
+        $ticketQuantity = request('ticket_quantity');
+        $amount = $ticketQuantity * $concert->ticket_price;
+        $token = request('payment_token');
+        $this->paymentGateway->charge($amount, $token);
+        return response()->json([], 201);
+    }
+}

routes/web.php

@@ -12,3 +12,5 @@
 */
 
 Route::get('/concerts/{id}', 'ConcertsController@show');
+
+Route::post('/concerts/{id}/orders', 'ConcertOrdersController@store');

tests/features/PurchaseTicketsTest.php

@@ -1,14 +1,22 @@
 <?php
 
+use App\Concert;
+use App\Billing\PaymentGateway;
+use App\Billing\FakePaymentGateway;
 use Illuminate\Foundation\Testing\WithoutMiddleware;
 use Illuminate\Foundation\Testing\DatabaseMigrations;
 use Illuminate\Foundation\Testing\DatabaseTransactions;
 
 class PurchaseTicketsTest extends TestCase
 {
+    use DatabaseMigrations;
+
     /** @test */
     function customer_can_purchase_concert_tickets()
     {
+        $paymentGateway = new FakePaymentGateway;
+        $this->app->instance(PaymentGateway::class, $paymentGateway);
+
         // Arrange
         // Create a concert
         $concert = factory(Concert::class)->create(['ticket_price' => 3250]);
@@ -22,6 +30,8 @@ class PurchaseTicketsTest extends TestCase
         ]);
 
         // Assert
+        $this->assertResponseStatus(201);
+
         // Make sure the customer was charged the correct amount
         $this->assertEquals(9750, $paymentGateway->totalCharges());
 

tests/unit/Billing/FakePaymentGatewayTest.php

@@ -0,0 +1,19 @@
+<?php
+
+use App\Billing\FakePaymentGateway;
+use Illuminate\Foundation\Testing\WithoutMiddleware;
+use Illuminate\Foundation\Testing\DatabaseMigrations;
+use Illuminate\Foundation\Testing\DatabaseTransactions;
+
+class FakePaymentGatewayTest extends TestCase
+{
+    /** @test */
+    function charges_with_a_valid_payment_token_are_successful()
+    {
+        $paymentGateway = new FakePaymentGateway;
+
+        $paymentGateway->charge(2500, $paymentGateway->getValidTestToken());
+
+        $this->assertEquals(2500, $paymentGateway->totalCharges());
+    }
+}