InventoryTest.php

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<?php
namespace Magento\Catalog\Test\Unit\Block\Adminhtml\Product\Edit\Action\Attribute\Tab;

class InventoryTest extends \PHPUnit\Framework\TestCase
{
    protected $backordersMock;

    protected $stockConfigurationMock;

    protected $contextMock;

    protected $requestMock;

    protected $inventory;

    protected function setUp()
    {
        $objectManager = new \Magento\Framework\TestFramework\Unit\Helper\ObjectManager($this);

        $this->contextMock = $this->createPartialMock(\Magento\Backend\Block\Template\Context::class, ['getRequest']);
        $this->backordersMock = $this->createMock(\Magento\CatalogInventory\Model\Source\Backorders::class);
        $this->stockConfigurationMock = $this->getMockForAbstractClass(
            \Magento\CatalogInventory\Api\StockConfigurationInterface::class,
            [],
            '',
            false
        );
        $this->requestMock = $this->getMockForAbstractClass(
            \Magento\Framework\App\RequestInterface::class,
            ['getParam'],
            '',
            false
        );

        $this->contextMock->expects($this->once())
            ->method('getRequest')
            ->will($this->returnValue($this->requestMock));

        $this->inventory = $objectManager->getObject(
            \Magento\Catalog\Block\Adminhtml\Product\Edit\Action\Attribute\Tab\Inventory::class,
            [
                'context' => $this->contextMock,
                'backorders' => $this->backordersMock,
                'stockConfiguration' => $this->stockConfigurationMock
            ]
        );
    }

    public function testGetBackordersOption()
    {
        $this->backordersMock->expects($this->once())
            ->method('toOptionArray')
            ->will($this->returnValue('return-value'));
        $this->assertEquals('return-value', $this->inventory->getBackordersOption());
    }

    public function testGetFieldSuffix()
    {
        $this->assertEquals('inventory', $this->inventory->getFieldSuffix());
    }

    public function testGetStoreId()
    {
        $this->requestMock->expects($this->once())
            ->method('getParam')
            ->with('store')
            ->will($this->returnValue('125'));

        $this->assertTrue(is_integer($this->inventory->getStoreId()));
    }

    public function testGetDefaultConfigValue()
    {
        $this->stockConfigurationMock->expects($this->once())
            ->method('getDefaultConfigValue')
            ->with('field-name')
            ->will($this->returnValue('return-value'));

        $this->assertEquals('return-value', $this->inventory->getDefaultConfigValue('field-name'));
    }

    public function testGetTabLabel()
    {
        $this->assertEquals('Advanced Inventory', $this->inventory->getTabLabel());
    }

    public function testGetTabTitle()
    {
        $this->assertEquals('Advanced Inventory', $this->inventory->getTabLabel());
    }

    public function testCanShowTab()
    {
        $this->assertTrue($this->inventory->canShowTab());
    }

    public function testIsHidden()
    {
        $this->assertFalse($this->inventory->isHidden());
    }

    public function testIsEnabled()
    {
        $this->assertEquals(true, $this->inventory->isAvailable('field'));
    }
}