Integration Test Annotation magentoAppArea breaks with some valid values

[Vinai]

The following test breaks due to Annotation\AppArea trying to init the design.

/**
 * @magentoAppArea webapi_rest
 */
public function testTheModuleRegisteresAnAddressRepositoryPlugin()
{
    /** @var \Magento\TestFramework\Interception\PluginList $pluginList */
    $pluginList = $this->objectManager->get(PluginList::class);
    $pluginInfo = $pluginList->get(AddressRepositoryInterface::class, []);
    $this->assertSame(AddressRepositoryPlugin::class, $pluginInfo['example_module'[['instance']);
}

The relevant part of the stack trace is:

PHP Fatal error:  Uncaught InvalidArgumentException: Incorrect theme identification key in .../mage2-ce/vendor/magento/framework/View/Design/Theme/FlyweightFactory.php:56
Stack trace:
#0 .../mage2-ce/vendor/magento/module-theme/Model/View/Design.php(147): Magento\Framework\View\Design\Theme\FlyweightFactory->create(NULL, 'webapi_rest')
#1 .../mage2-ce/vendor/magento/module-theme/Model/View/Design.php(211): Magento\Theme\Model\View\Design->setDesignTheme(NULL)
Fatal error: Uncaught InvalidArgumentException: Incorrect theme identification key in .../mage2-ce/vendor/magento/framework/View/Design/Theme/FlyweightFactory.php on line 56
#2 .../mage2-ce/vendor/magento/framework/App/Area.php(256): Magento\Theme\Model\View\Design->setDefaultDesignTheme()
#3 .../mage2-ce/vendor/magento/framework/App/Area.php(214): Magento\Framework\App\Area->_initDesign()
InvalidArgumentException: Incorrect theme identification key in .../mage2-ce/vendor/magento/framework/View/Design/Theme/FlyweightFactory.php on line 56
#4 .../mage2-ce/vendor/magento/framework/App/Area.php(136): Magento\Framework\App\Area->_loadPart('design')

...

Magento\TestFramework\Annotation\AppArea->startTest() .../mage2-ce/dev/tests/integration/framework/Magento/TestFramework/EventManager.php:49
Magento\TestFramework\Application->loadArea() .../mage2-ce/dev/tests/integration/framework/Magento/TestFramework/Annotation/AppArea.php:82
Magento\TestFramework\Helper\Bootstrap->loadArea() .../mage2-ce/dev/tests/integration/framework/Magento/TestFramework/Application.php:615
Magento\Framework\App\Area->load() .../mage2-ce/dev/tests/integration/framework/Magento/TestFramework/Helper/Bootstrap.php:157
Magento\Framework\App\Area->_loadPart() .../mage2-ce/vendor/magento/framework/App/Area.php:136
Magento\Framework\App\Area->_initDesign() .../mage2-ce/vendor/magento/framework/App/Area.php:214
Magento\Theme\Model\View\Design->setDefaultDesignTheme() .../mage2-ce/vendor/magento/framework/App/Area.php:256
Magento\Theme\Model\View\Design->setDesignTheme() .../mage2-ce/vendor/magento/module-theme/Model/View/Design.php:211
Magento\Framework\View\Design\Theme\FlyweightFactory->create() .../mage2-ce/vendor/magento/module-theme/Model/View/Design.php:147

This is despite \Magento\TestFramework\Annotation\AppArea defining the valid areas as

/**
 * List of allowed areas
 *
 * @var array
 */
private $_allowedAreas = [
    \Magento\Framework\App\Area::AREA_GLOBAL,
    \Magento\Backend\App\Area\FrontNameResolver::AREA_CODE,
    \Magento\Framework\App\Area::AREA_FRONTEND,
    'webapi_rest',
    'webapi_soap',
    'cron',
];

The same error happens for webapi_soap and cron, too.
The other ones, frontend, adminhtml and global work as expected.

[Vinai]

In case google brings someone here, a possible workaround instead of using the @magentoAppArea annotation is:

public function testTheModuleRegisteresAnAddressRepositoryPlugin()
{
    /** @var ScopeInterface $scopeConfig */
    $scopeConfig = $this->objectManager->get(ScopeInterface::class);
    $scopeConfig->setCurrentScope('webapi_rest');

    /** @var \Magento\TestFramework\Interception\PluginList $pluginList */
    $pluginList = $this->objectManager->get(PluginList::class);
    $pluginInfo = $pluginList->get(AddressRepositoryInterface::class, []);
    $this->assertSame(AddressRepositoryPlugin::class, $pluginInfo['example_module'[['instance']);
}

Just be aware the setting will persist between tests, so be sure to reset the current scope in tearDown (something that the annotation does automatically).

[duhon]

Hello @Vinai

Please, provide the used version. If the problem is actual for a specific tag, please, specify it and be sure that the latest update was used.

[Vinai]

This happens in 2.1.0-rc3 and the HEAD of the develop branch.