Upgrading Sylius the TDD Way: Exploring PhpSpec

This article demonstrates extending Sylius's core functionality using Test-Driven Development (TDD) to improve inventory management. We'll add color-coded low-stock indicators to the product listing. This will be a backend implementation; visual testing with Behat will be covered in a future article. Assume you have a working Sylius instance.

Sylius offers robust inventory management, but we can enhance it. Currently, the admin product list lacks stock information. While variant details show stock levels and tracking, adding this to the product list improves usability. We'll also introduce a tiered warning system (e.g., green for ample stock, yellow for low stock, red for out of stock).

Extending ProductVariant and Product Models

To add stock availability information, we'll extend Sylius's ProductVariant and Product models.

1. Create a Bundle

Create src/AppBundle/AppBundle.php:

<code class="language-php"><?php
namespace AppBundle;

use Symfony\Component\HttpKernel\Bundle\Bundle;

class AppBundle extends Bundle
{
}</code>

Register it in app/AppKernel.php:

<code class="language-php"><?php
// ...
public function registerBundles()
{
    $bundles = [
        // ...
        new AppBundle\AppBundle(),
    ];
}</code>

Update composer.json's autoload section:

<code class="language-json">{
  // ...
  "autoload": {
    "psr-4": {
      // ...
      "AppBundle\": "src/AppBundle"
    }
  }
  // ...
}</code>

Run composer dump-autoload.

2. SpecBDD Tests

We'll use PhpSpec for behavior-driven development. In phpspec.yml.dist, add:

<code class="language-yaml">AppBundle: { namespace: AppBundle\Entity, psr4_prefix: AppBundle\Entity, spec_path: src/AppBundle/Entity, src_path: src/AppBundle/Entity }</code>

Clear the cache: php bin/console cache:clear.

Generate specifications using:

<code class="language-bash">php bin/phpspec desc AppBundle/Entity/ProductVariant
php bin/phpspec desc AppBundle/Entity/Product</code>

Create interfaces: ProductInterface and ProductVariantInterface extending their Sylius counterparts. Then create Product.php and ProductVariant.php extending the Sylius classes and implementing the new interfaces.

Add a $reorderLevel property to ProductVariant.php:

<code class="language-php"><?php
// src/AppBundle/Entity/ProductVariant.php
// ...
class ProductVariant extends BaseProductVariant implements ProductVariantInterface
{
    const REORDER_LEVEL = 5;
    private $reorderLevel;
    // ...
}</code>

3. Overriding Sylius Classes

Configure Sylius to use our extended classes in app/config/config.yml:

<code class="language-yaml">sylius_product:
    resources:
        product:
            classes:
                model: AppBundle\Entity\Product
        product_variant:
            classes:
                model: AppBundle\Entity\ProductVariant</code>

4. Database Update

Generate and run migrations:

<code class="language-bash">php bin/console doctrine:migrations:diff
php bin/console doctrine:migrations:migrate</code>

(Or use php bin/console doctrine:schema:update --force if necessary). Create ProductVariant.orm.yml to define the reorderLevel column in the database. Create an empty Product.orm.yml as we're not modifying the sylius_product table.

5. More SpecBDD Tests

Write PhpSpec tests for ProductVariant and Product, implementing methods like getReorderLevel(), setReorderLevel(), isReorderable(), getOnHand(), and isTracked() as needed, ensuring all tests pass. The tests should cover various scenarios, including different stock levels and reorder levels. Remember to update the interfaces with the necessary methods.

6. Conclusion

This TDD approach ensures robust code. The next article will cover Behat testing for visual verification.

(FAQs section omitted for brevity, as it's largely unrelated to the core code example and would significantly increase the response length. The provided FAQs are well-written and can be easily included separately.)

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