Const argument in virtual type breaks magento2 [closed]

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So, I'm using the code from here sample-payment and I have in di.xml the following code:

<!-- Payment Method Facade configuration -->
<virtualType name="SamplePaymentGatewayFacade" type="Magento\Payment\Model\Method\Adapter">
    <arguments>
        <argument name="code" xsi:type="const">Magento\SamplePaymentGateway\Model\Ui\ConfigProvider::CODE</argument>
        <argument name="formBlockType" xsi:type="string">Magento\Payment\Block\Form</argument>
        <argument name="infoBlockType" xsi:type="string">Magento\SamplePaymentGateway\Block\Info</argument>
        <argument name="valueHandlerPool" xsi:type="object">SamplePaymentGatewayValueHandlerPool</argument>
        <argument name="commandPool" xsi:type="object">SamplePaymentGatewayCommandPool</argument>
    </arguments>
</virtualType>

<!-- Configuration reader -->
<virtualType name="SamplePaymentGatewayConfig" type="Magento\Payment\Gateway\Config\Config">
    <arguments>
        <argument name="methodCode" xsi:type="const">Magento\SamplePaymentGateway\Model\Ui\ConfigProvider::CODE</argument>
    </arguments>
</virtualType>

that when running it in this way it breaks the magento2. Note: the code is under root/app/code stored.

With breaks I mean the following:

when I run a simple php bin/magento list I receive:

root@ea40a2340686:/var/www/magento2# php bin/magento list
Magento CLI version 2.1.10

Usage:
 command [options] [arguments]

Options:
 --help (-h)           Display this help message
 --quiet (-q)          Do not output any message
 --verbose (-v|vv|vvv) Increase the verbosity of messages: 1 for normal output, 2 for more verbose output and 3 for debug
 --version (-V)        Display this application version
 --ansi                Force ANSI output
 --no-ansi             Disable ANSI output
 --no-interaction (-n) Do not ask any interactive question

Available commands:
 help   Displays help for a command
 list   Lists commands
We're sorry, an error occurred. Try clearing the cache and code generation directories. By default, they are: var/cache, var/di, var/generation, and var/page_cache.



  [InvalidArgumentException]
  Constant name is expected.

And if I try now to do something in the browser I get:

Fatal error: Cannot declare class Magento\SamplePaymentGateway\Model\Ui\ConfigProvider, because the name is already in use in /var/www/magento2/app/code/Magento/SamplePaymentGateway/Model/Ui/ConfigProvider.php on line 22

The class:

/**
 * Class ConfigProvider
 */
final class ConfigProvider implements ConfigProviderInterface
{
    const CODE = 'sample_gateway';

    /**
     * Retrieve assoc array of checkout configuration
     *
     * @return array
     */
    public function getConfig()
    {
        return [
            'payment' => [
                self::CODE => [
                    'transactionResults' => [
                        ClientMock::SUCCESS => __('Success'),
                        ClientMock::FAILURE => __('Fraud'),
                    ],
                ],
            ],
        ];
    }
}

If I remove this line (and the other one in the other virtual type) in the di.xml:

<argument name="code" xsi:type="const">Magento\SamplePaymentGateway\Model\Ui\ConfigProvider::CODE</argument>

everything works again.

So, my question: What is wrong by this declaration of the const?

As from the config.xsd and types.xsd everything should be ok.

<!-- config.xsd -->
<xs:complexType name="const">
    <xs:complexContent>
        <xs:extension base="argumentType" />
    </xs:complexContent>
</xs:complexType>

and

<!-- types.xsd -->
<xs:complexType name="argumentType" abstract="true" mixed="true">
    <xs:attribute name="name" use="required"/>
</xs:complexType>

PS: I'm using Magento2 V2.1.10 with php 7.0.12 in the magento2devbox.

Answer 1

Apparently for me was just a type in the namespace of the ConfigProvider class. Instead of namespace Magento\SamplePaymentGateway\Model\Ui; was only namespace Magento\MyTestPaymentGateway\Model\Ui;.

I've copied this from another test project and that's the reason didn't find the const.

PS: If you have this error -> be careful with typos!!