Updated example

Author: sebastiandedeyne

example/composer.json

@@ -2,5 +2,10 @@
     "require": {
         "spatie/phpunit-snapshot-assertions": "^0.4.0",
         "phpunit/phpunit": "^6.0"
+    },
+    "autoload": {
+        "psr-4": {
+            "App\\": "src/"
+        }
     }
 }

example/src/Order.php

@@ -0,0 +1,45 @@
+<?php
+
+namespace App;
+
+class Order
+{
+    /** @var int */
+    private $id;
+
+    /** @var string */
+    private $email;
+
+    /** @var bool */
+    private $paid;
+    
+    /** @var \App\OrderLine[] */
+    private $orderLines;
+
+    public function __construct(int $id, string $email, bool $paid, array $orderLines) {
+        $this->id = $id;
+        $this->email = $email;
+        $this->paid = $paid;
+        $this->orderLines = $orderLines;
+    }
+
+    public function id(): int
+    {
+        return $this->id;
+    }
+
+    public function email(): string
+    {
+        return $this->email;
+    }
+
+    public function paid(): bool
+    {
+        return $this->paid;
+    }
+
+    public function orderLines(): array
+    {
+        return $this->orderLines;
+    }
+}

example/src/OrderLine.php

@@ -0,0 +1,50 @@
+<?php
+
+namespace App;
+
+class OrderLine
+{
+    /** @var int */
+    private $id;
+
+    /** @var string */
+    private $description;
+
+    /** @var int */
+    private $unitPrice;
+
+    /** @var int */
+    private $quantity;
+
+    public function __construct(int $id, string $description, int $unitPrice, int $quantity) {
+        $this->id = $id;
+        $this->description = $description;
+        $this->unitPrice = $unitPrice;
+        $this->quantity = $quantity;
+    }
+
+    public function id(): int
+    {
+        return $this->id;
+    }
+
+    public function description(): string
+    {
+        return $this->description;
+    }
+
+    public function unitPrice(): int
+    {
+        return $this->unitPrice;
+    }
+
+    public function quantity(): int
+    {
+        return $this->quantity;
+    }
+
+    public function totalPrice(): int
+    {
+        return $this->unitPrice * $this->quantity;
+    }
+}

example/src/OrderSerializer.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace App;
+
+class OrderSerializer
+{
+    public function serialize(Order $order): string
+    {
+        $data = [
+            'id' => $order->id(),
+            'email' => $order->email(),
+            'paid' => $order->paid() ? 1 : 0,
+            'items' => [],
+        ];
+
+        foreach ($order->orderLines() as $orderLine) {
+            $data['items'][] = [
+                'id' => $orderLine->id(),
+                'description' => $orderLine->description(),
+                'price' => $orderLine->totalPrice(),
+            ];
+        }
+
+        return json_encode($data);
+    }
+}

example/tests/ExampleTest.php

@@ -0,0 +1,25 @@
+<?php
+
+use App\Order;
+use App\OrderLine;
+use App\OrderSerializer;
+use PHPUnit\Framework\TestCase;
+use Spatie\Snapshots\MatchesSnapshots;
+
+class OrderSerializerTest extends TestCase
+{
+    use MatchesSnapshots;
+
+    /** @test */
+    public function it_can_serialize_an_order()
+    {
+        $orderSerializer = new OrderSerializer();
+
+        $order = new Order(1, 'sebastian@spatie.be', true, [
+            new OrderLine(1, 'Sublime Text License', 70, 3),
+            new OrderLine(2, 'PHPStorm License', 199, 2),
+        ]);
+
+        $this->assertMatchesJsonSnapshot($orderSerializer->serialize($order));
+    }
+}