[#3] - Introduce Facade entry point and tests refactoring

README.md

@@ -1,16 +1,17 @@
 # Sample cart project
 
 ## sample usage
+
 ```
 <?php
 
-    $basket = (new BasketFactory())->createRegularBasket();
-    $basket->add('G01');
-    $basket->add('R01');
-    $basket->add('R01');
-    $basket->add('R01');
+    $simpleCart = new SimpleCartFacade();
+    $simpleCart->add('G01');
+    $simpleCart->add('R01');
+    $simpleCart->add('R01');
+    $simpleCart->add('R01');
 
-    $total = $basket->total();
+    $total = $simpleCart->total();
 ```
 
 ## assumptions:
@@ -30,15 +31,15 @@
 ## instalation
 
 1. `docker-compose up -d`
-2. inside container `composer install` 
+2. inside container `composer install`
    or simply `docker exec -it php_sample_cart bash -c "composer install"`
 
 ## run tests:
 
 - unit
-    -  `docker exec -it php_sample_cart bash -c "vendor/bin/phpunit --configuration phpunit --testsuite 'Unit Tests'"`
+    - `docker exec -it php_sample_cart bash -c "vendor/bin/phpunit --configuration phpunit.xml --testsuite 'Unit Tests'"`
 - integration
-    -  `docker exec -it php_sample_cart bash -c "vendor/bin/phpunit --configuration phpunit --testsuite 'Integration Tests'"`
+    - `docker exec -it php_sample_cart bash -c "vendor/bin/phpunit --configuration phpunit.xml --testsuite 'Integration Tests'"`
 - unit + integration:
     - `docker exec -it php_sample_cart bash -c "composer test"`
 - static tests (`phpstan`)

docker-compose.yml

@@ -1,5 +1,3 @@
-version: '3.8'
-
 services:
   php:
     build:

phpunit.xml

@@ -1,5 +1,8 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         displayDetailsOnTestsThatTriggerDeprecations="true"
+         displayDetailsOnTestsThatTriggerErrors="true"
+         displayDetailsOnTestsThatTriggerNotices="true"
          displayDetailsOnTestsThatTriggerWarnings="true"
          bootstrap="vendor/autoload.php"
          colors="true"

src/App/CartFacade.php

@@ -0,0 +1,13 @@
+<?php
+declare(strict_types=1);
+
+namespace App\App;
+
+use App\Model\BasketFactory;
+
+interface CartFacade
+{
+    public function add(string $code): void;
+
+    public function total(): float;
+}

src/App/SimpleCartFacade.php

@@ -0,0 +1,33 @@
+<?php
+declare(strict_types=1);
+
+namespace App\App;
+
+use App\Model\Basket;
+use App\Model\BasketFactory;
+use App\Model\RegularBasketFactory;
+
+class SimpleCartFacade implements CartFacade
+{
+    private Basket $regularBasket;
+
+    public function __construct()
+    {
+        $this->regularBasket = $this->createBasketFactory()->createRegularBasket();
+    }
+
+    public function add(string $code): void
+    {
+        $this->regularBasket->add($code);
+    }
+
+    public function total(): float
+    {
+        return $this->regularBasket->total();
+    }
+
+    private function createBasketFactory(): BasketFactory
+    {
+        return new RegularBasketFactory();
+    }
+}

src/Model/BasketFactory.php

@@ -6,36 +6,7 @@
 use App\Repository\JsonProductRepository;
 use App\Repository\ProductRepository;
 
-class BasketFactory
+interface BasketFactory
 {
-    public function createRegularBasket(): Basket
-    {
-        return new RegularBasket(
-            $this->createProductCatalogueFilterable(),
-            $this->createShippingCostCalculator(),
-            $this->createDiscountOfferCalculator(),
-        );
-    }
-
-    private function createProductCatalogueFilterable(): ProductCatalogueFilterable
-    {
-        return new ProductCatalogue(
-            $this->createProductRepository(),
-        );
-    }
-
-    private function createProductRepository(): ProductRepository
-    {
-        return new JsonProductRepository();
-    }
-
-    private function createShippingCostCalculator(): ShippingCostCalculator
-    {
-        return new BaseShippingCostCalculator();
-    }
-
-    private function createDiscountOfferCalculator(): DiscountOfferCalculator
-    {
-        return new BaseDiscountOfferCalculator();
-    }
-}
+    public function createRegularBasket(): Basket;
+}

src/Model/RegularBasket.php

@@ -36,4 +36,4 @@ public function total(): float
 
         return round($total, 2);
     }
-}
+}

src/Model/RegularBasketFactory.php

@@ -0,0 +1,41 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Model;
+
+use App\Repository\JsonProductRepository;
+use App\Repository\ProductRepository;
+
+class RegularBasketFactory implements BasketFactory
+{
+    public function createRegularBasket(): Basket
+    {
+        return new RegularBasket(
+            $this->createProductCatalogueFilterable(),
+            $this->createShippingCostCalculator(),
+            $this->createDiscountOfferCalculator(),
+        );
+    }
+
+    private function createProductCatalogueFilterable(): ProductCatalogueFilterable
+    {
+        return new ProductCatalogue(
+            $this->createProductRepository(),
+        );
+    }
+
+    private function createProductRepository(): ProductRepository
+    {
+        return new JsonProductRepository();
+    }
+
+    private function createShippingCostCalculator(): ShippingCostCalculator
+    {
+        return new BaseShippingCostCalculator();
+    }
+
+    private function createDiscountOfferCalculator(): DiscountOfferCalculator
+    {
+        return new BaseDiscountOfferCalculator();
+    }
+}

tests/Integration/Model/RegularBasketTest.php → tests/Integration/App/SimpleCartFacadeTest.php

@@ -1,20 +1,21 @@
 <?php
 declare(strict_types=1);
 
-namespace App\Unit\Tests\Model;
+namespace App\Unit\Tests\Itegration\App;
 
-use App\Model\Basket;
-use App\Model\BasketFactory;
+use App\App\CartFacade;
+use App\App\SimpleCartFacade;
 use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
 
-final class RegularBasketTest extends TestCase
+class SimpleCartFacadeTest extends TestCase
 {
-    private Basket $sut;
+
+    private CartFacade $sut;
 
     protected function setUp(): void
     {
-        $this->sut = (new BasketFactory())->createRegularBasket();
+        $this->sut = new SimpleCartFacade();
 
         parent::setUp();
     }

tests/Unit/Model/BaseDiscountOfferCalculatorTest.php

@@ -0,0 +1,57 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Tests\Unit\Model;
+
+use App\Entity\Product;
+use App\Model\BaseDiscountOfferCalculator;
+use App\Model\DiscountOfferCalculator;
+use PHPUnit\Framework\Attributes\DataProvider;
+use PHPUnit\Framework\TestCase;
+
+class BaseDiscountOfferCalculatorTest extends TestCase
+{
+    private DiscountOfferCalculator $sut;
+
+    protected function setUp(): void
+    {
+        $this->sut = new BaseDiscountOfferCalculator();
+        parent::setUp();
+    }
+
+    /**
+     * @param array<Product> $productList
+     */
+    #[DataProvider('totalDataProvider')]
+    public function testShippingCostStrategiesProvidesCorrectValue(array $productList, float $expectedDiscount): void
+    {
+        $actualShippingCosts = $this->sut->calculate($productList);
+
+        $this->assertEquals($expectedDiscount, $actualShippingCosts);
+    }
+
+    /**
+     * @return array<string, array<string,array<Product>|float>>
+     */
+    public static function totalDataProvider(): array
+    {
+        $aRedProduct = new Product();
+        $aRedProduct->setCode('R01');
+        $aRedProduct->setName('RedOne');
+        $aRedProduct->setPrice(10.0);
+
+
+        $aGreenProduct = new Product();
+        $aGreenProduct->setCode('G01');
+        $aGreenProduct->setName('GreenOne');
+        $aGreenProduct->setPrice(100.0);
+
+        return [
+            'Two red products gives discount'        => ['productList' => [$aRedProduct, $aRedProduct], 'expectedDiscount' => 5.0],
+            'Three red products gives discount once' => ['productList' => [$aRedProduct, $aRedProduct, $aRedProduct], 'expectedDiscount' => 5.0],
+            'Four red products gives discount once'  => ['productList' => [$aRedProduct, $aRedProduct, $aRedProduct, $aRedProduct], 'expectedDiscount' => 10.0],
+            'Two green products dont gives discount' => ['productList' => [$aGreenProduct, $aGreenProduct], 'expectedDiscount' => .0],
+            'Mixed products dont gives discount'     => ['productList' => [$aRedProduct, $aGreenProduct], 'expectedDiscount' => .0],
+        ];
+    }
+}

tests/Unit/Model/BaseShippingCostCalculatorTest.php

@@ -0,0 +1,42 @@
+<?php
+declare(strict_types=1);
+
+namespace App\Tests\Unit\Model;
+
+use App\Model\BaseShippingCostCalculator;
+use App\Model\ShippingCostCalculator;
+use PHPUnit\Framework\Attributes\DataProvider;
+use PHPUnit\Framework\TestCase;
+
+class BaseShippingCostCalculatorTest extends TestCase
+{
+    private ShippingCostCalculator $sut;
+
+    protected function setUp(): void
+    {
+        $this->sut = new BaseShippingCostCalculator();
+        parent::setUp();
+    }
+
+    #[DataProvider('totalDataProvider')]
+    public function testShippingCostStrategiesProvidesCorrectValue(float $total, float $expectedShippingCost): void
+    {
+        $actualShippingCosts = $this->sut->calculate($total);
+
+        $this->assertEquals($expectedShippingCost, $actualShippingCosts);
+    }
+
+    /**
+     * @return array<string, array<string,float>>
+     */
+    public static function totalDataProvider(): array
+    {
+        return [
+            'Low shipping cost strategy is calculated'    => ['total' => 10.0, 'expectedShippingCost' => 4.95],
+            'Medium shipping cost strategy is calculated on boundary value' => ['total' => 50.0, 'expectedShippingCost' => 2.95],
+            'Medium shipping cost strategy is calculated' => ['total' => 51.0, 'expectedShippingCost' => 2.95],
+            'High shipping cost strategy is calculated on boundary value'   => ['total' => 90.0, 'expectedShippingCost' => .0],
+            'High shipping cost strategy is calculated'   => ['total' => 91.0, 'expectedShippingCost' => .0],
+        ];
+    }
+}

tests/Unit/Model/ProductCatalogueTest.php

@@ -1,7 +1,7 @@
 <?php
 declare(strict_types=1);
 
-namespace App\Tests\Model;
+namespace App\Tests\Unit\Model;
 
 use App\Entity\Product;
 use App\Exception\ProductNotFoundException;