• CLI command to show product status for SKU matches
• CLI command to disable and enable products
• REST API exposing the same functionality, accessible only by admins

• Dependency Injection (DI)
• Unit Tests
• Design by Contract (PHP Interfaces)
• Basic Module Structure
• API Service Contracts
• Repository usage
• Web-API and ACL
• Token based REST API authentication and access
• Code Generation (Proxy)

• Plugins
• Routing and Actions
• Layout
• Virtual Types
• Repository implementation
• Data API
• Events
• JS Framework
• Static-, Integration-, Functional-, Performance- and JS-Tests
• Magento 2 Core Modules...
• So much more...

• Create app/code/MageTitans/ProductStatus/etc/module.xml
• Create app/code/MageTitans/ProductStatus/registration.php
• Run bin/magento module:status -> present but disabled
• Run bin/magento module:enable MageTitans_ProductStatus
• Run bin/magento setup:upgrade
• Run bin/magento module:status -> present and enabled

• Create app/code/MageTitans/ProductStatus/Test/Unit/Console/Command/ShowProductStatusCommandTest.php
• Test the class ShowProductStatusCommand exists
• In the Magento base directory, run vendor/bin/phpunit -c dev/tests/unit/phpunit.xml.dist app/code/MageTitans/ProductStatus/Test/Unit
• Create app/code/MageTitans/ProductStatus/Console/Command/ShowProductStatusCommand.php
• Test the class is a Symfony\Component\Console\Command\Command
• Test it has a name catalog:product:status
• Test it has a description
• Test it takes a required SKU argument
• Test it displays exceptions as error messages
• Test it displays a message if there are no matches
• Test it displays a message if no products matched the given SKU
• Test it displays the status for all returned products

• Create app/code/MageTitans/ProductStatus/Model/ProductStatusAdapterInterface.php

• Import new interface, remove stub method declaration
• Add ENABLED and DISABLED constants to interface and use them in the test instead of hardcoded status strings

• Create app/code/MageTitans/ProductStatus/Test/Unit/Model/ProductStatusAdapterTest.php
• Test the class exists
• Test the class implements ProductStatusAdapterInterface
• Test it throws an exception in SKU is not a string or empty
• Test it queries a product repository
• Test it returns an empty array if there is no match
• Test it translates the product repository search results into status array
• Test it adds the SKU as search criteria

• Create app/code/MageTitans/ProductStatus/etc/di.xml
• Add preference for ProductStatusAdapterInterface to point to ProductStatusAdapter\Proxy
• [Integration Test]: Create MageTitans\ProductStatus\Test\Integration\DiTest
• [Integration Test]: Test the show product status command is registered
• Add catalogProductStatus command to CommandList arguments in etc/di.xml
• Flush the config cache and run bin/magento catalog and check the new command is listed

• Create app/code/MageTitans/ProductStatus/Test/Unit/Console/Command/DisableProductCommandTest.php
• Test the class DisableProductCommand exists
• Test it is a Symfony\Component\Console\Command\Command
• Test it has the right name
• Test it has a description
• Test it takes a required SKU argument
• Test it delegates to the product status adapter
• Test it displays exceptions as error messages
• Test it displays a confirmation message

• Add a stub implementation to the class
• Make existing tests pass
• Test it throws an exception if the SKU is not a string or empty
• Test it throws an exception if the product already is disabled
• Test it disables an existing product
• Test it converts EntityNotFoundException to ProductStatusCommandExceptions for disable

• [Integration Test]: Test the disable product command is registered
• Add catalogProductDisable command to CommandList arguments in etc/di.xml
• Flush the config cache and run bin/magento catalog and check the new command is listed
• If still needed, workaround the issue "Area code not set: Area code must be set before starting a session." by injecting Magento\Framework\App\State and setting the area code adminhtml in ProductStatusAdapter::__construct(). Wrap it in a try/catch block since that will be required when the class is used in the API context.

• Almost the same steps are required as for the disable product command

• Again, this is very similar to implmenting the method disableProductWithSku

• Create app/code/MageTitans/ProductStatus/Api/ProductStatusManagementInterface.php
• Add one public method get($sku) returning a string
• Test the class MageTitans/ProductStatus/Model/ProductStatusManagement exists
• Test it implements the interface
• Test it delegates to a new method of the product status adapter getStatusBySku()

• Add a stub implementation to ProductStatusAdapter
• Make existing tests pass
• Test it throws an exception if the SKU is not a string or is empty
• Test it returns the products status string

• Add preference for \MageTitans\ProductStatus\Api\ProductStatusManagementInterface
• Add app/code/MageTitans/ProductStatus/etc/acl.xml
• Add a new resource admin -> catalog -> catalog_inventory -> product_status to the ACL
• Add app/code/MageTitans/ProductStatus/etc/webapi.xml
• Add a GET route to /V1/magetitans/product/status/:sku mapping to the ProductStatusManagementInterface::get method

• Get a token

curl -X POST "http://magetitans2015.dev/rest/V1/integration/admin/token" \
  -H "content-type:application/json" \
  -d '{"username":"admin", "password":"<PASSWORD>"}'

• Send a request to the new resource

curl -X GET "http://magetitans2015.dev/rest/V1/magetitans/product/status/<SKU>" \
    -H "content-type:application/json" \
    -H "Authorization: Bearer <TOKEN>"

By following steps similar to the examples above, implement a CLI command to enable and disable products.

Add a new REST API resource to set the status of products.

Example call to the REST resource to enable a product.

curl -X PUT "http://magetitans2015.dev/rest/V1/magetitans/product/status/<SKU>>" \
    -H "content-type:application/json" \
    -H "Authorization: Bearer <TOKEN>>" \
    -d'{"status":"enabled"}'