Examples for presentation.

tests/Unit/BadTest.php

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+<?php
+
+namespace Tests\Unit;
+
+use Example\Bad\APIService;
+use Example\Bad\CalculatorService;
+use Example\Bad\Controller;
+use Example\Bad\Repository;
+use Example\Bad\Product;
+use GuzzleHttp\Client;
+use GuzzleHttp\Psr7\Request;
+use GuzzleHttp\Psr7\Response;
+use PDO;
+use PDOStatement;
+use PHPUnit\Framework\TestCase;
+
+class BadTest extends TestCase
+{
+    public function testBad()
+    {
+        $guzzleClient = $this->createMock(Client::class);
+
+        // make call of controller from the guzzle client
+        $guzzleClient->method('request')->willReturn(
+            new Response(200, [],
+                '[
+                { "sku" : "x1234", "amount": "10" },
+                { "sku" : "x1235", "amount": "20" },
+                { "sku" : "x4567", "amount": "5" }
+            ]'
+            )
+        );
+
+        $pdo = $this->createMock(PDO::class);
+        $pdoResult = $this->createMock(PDOStatement::class);
+        $pdoResult->method('fetchAll')->willReturn([
+            (new Product())->setSku("x1234")->setPrice(10),
+            (new Product())->setSku("x1235")->setPrice(20),
+            (new Product())->setSku("x4567")->setPrice(30),
+        ]);
+        $pdo->method('query')->willReturn($pdoResult);
+
+        $dbService = new Repository($pdo);
+        $apiService = new ApiService($dbService, $guzzleClient);
+        $calculatorService = new CalculatorService(0.20, $apiService);
+        $controller = new Controller($calculatorService);
+
+        $products = $controller->getProducts(new Request('get', '/api', [], 'cosmetics'));
+
+        $expectedProducts = [
+            (new Product())->setSku("x1234")->setPrice(12)->setQuantity(10),
+            (new Product())->setSku("x1235")->setPrice(24)->setQuantity(20),
+            (new Product())->setSku("x4567")->setPrice(36)->setQuantity(5),
+        ];
+
+        $this->assertEquals($expectedProducts, $products);
+    }
+}