77 - Stubbing the Interface

app/Order.php

@@ -11,6 +11,7 @@ class Order extends Model
     public static function forTickets($tickets, $email, $amount)
     {
         $order = self::create([
+            'confirmation_number' => app(OrderConfirmationNumberGenerator::class)->generate(),
             'email' => $email,
             'amount' => $amount,
         ]);

app/OrderConfirmationNumberGenerator.php

@@ -0,0 +1,8 @@
+<?php
+
+namespace App;
+
+interface OrderConfirmationNumberGenerator
+{
+    public function generate();
+}

tests/features/PurchaseTicketsTest.php

@@ -3,6 +3,7 @@
 use App\Concert;
 use App\Billing\PaymentGateway;
 use App\Billing\FakePaymentGateway;
+use App\OrderConfirmationNumberGenerator;
 use Illuminate\Foundation\Testing\WithoutMiddleware;
 use Illuminate\Foundation\Testing\DatabaseMigrations;
 use Illuminate\Foundation\Testing\DatabaseTransactions;
@@ -51,8 +52,10 @@ class PurchaseTicketsTest extends TestCase
     {
         $this->disableExceptionHandling();
 
-        // The API we need in our app to be able to use a different generation strategy in our tests...
-        // $orderConfirmationNumberGenerator->generate(); // 'ORDERCONFIRMATION1234'
+        $orderConfirmationNumberGenerator = Mockery::mock(OrderConfirmationNumberGenerator::class, [
+            'generate' => 'ORDERCONFIRMATION1234',
+        ]);
+        $this->app->instance(OrderConfirmationNumberGenerator::class, $orderConfirmationNumberGenerator);
 
         $concert = factory(Concert::class)->states('published')->create(['ticket_price' => 3250])->addTickets(3);
 
@@ -65,7 +68,7 @@ class PurchaseTicketsTest extends TestCase
         $this->assertResponseStatus(201);
 
         $this->seeJsonSubset([
-            // 'confirmation_number' => 'ORDERCONFIRMATION1234',
+            'confirmation_number' => 'ORDERCONFIRMATION1234',
             'email' => 'john@example.com',
             'ticket_quantity' => 3,
             'amount' => 9750,