AttributeResolverTest.php

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<?php
namespace Magento\Customer\Test\Unit\Model\Metadata;

use Magento\Customer\Api\Data\AttributeMetadataInterface;
use Magento\Customer\Model\Attribute;
use Magento\Customer\Model\AttributeMetadataDataProvider;
use Magento\Customer\Model\Metadata\AttributeResolver;

class AttributeResolverTest extends \PHPUnit\Framework\TestCase
{
    protected $model;

    protected $metadataDataProviderMock;

    protected function setUp()
    {
        $this->metadataDataProviderMock = $this->getMockBuilder(
            \Magento\Customer\Model\AttributeMetadataDataProvider::class
        )->disableOriginalConstructor()->getMock();

        $this->model = new AttributeResolver(
            $this->metadataDataProviderMock
        );
    }

    public function testGetModelByAttribute()
    {
        $entityType = 'type';
        $attributeCode = 'code';

        $attributeMock = $this->getMockBuilder(\Magento\Customer\Api\Data\AttributeMetadataInterface::class)
            ->disableOriginalConstructor()
            ->getMock();
        $attributeMock->expects($this->once())
            ->method('getAttributeCode')
            ->willReturn($attributeCode);

        $modelMock = $this->getMockBuilder(\Magento\Customer\Model\Attribute::class)
            ->disableOriginalConstructor()
            ->getMock();

        $this->metadataDataProviderMock->expects($this->once())
            ->method('getAttribute')
            ->with($entityType, $attributeCode)
            ->willReturn($modelMock);

        $this->assertEquals($modelMock, $this->model->getModelByAttribute($entityType, $attributeMock));
    }

    public function testGetModelByAttributeWithoutModel()
    {
        $entityType = 'type';
        $attributeCode = 'code';

        $attributeMock = $this->getMockBuilder(\Magento\Customer\Api\Data\AttributeMetadataInterface::class)
            ->disableOriginalConstructor()
            ->getMock();
        $attributeMock->expects($this->exactly(2))
            ->method('getAttributeCode')
            ->willReturn($attributeCode);

        $this->metadataDataProviderMock->expects($this->once())
            ->method('getAttribute')
            ->with($entityType, $attributeCode)
            ->willReturn(false);

        $this->model->getModelByAttribute($entityType, $attributeMock);
    }
}