CostTest.php

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<?php
namespace Magento\Sales\Test\Unit\Model\Order\Creditmemo\Total;

class CostTest extends \PHPUnit\Framework\TestCase
{
    protected $total;

    protected $creditmemoMock;

    protected $creditmemoItemMock;

    protected function setUp()
    {
        $this->creditmemoMock = $this->createPartialMock(
            \Magento\Sales\Model\Order\Creditmemo::class,
            ['setBaseCost', 'getAllItems']
        );
        $this->creditmemoItemMock = $this->createPartialMock(
            \Magento\Sales\Model\Order\Creditmemo\Item::class,
            ['getHasChildren', 'getBaseCost', 'getQty']
        );
        $this->total = new \Magento\Sales\Model\Order\Creditmemo\Total\Cost();
    }

    public function testCollect()
    {
        $this->creditmemoMock->expects($this->once())
            ->method('getAllItems')
            ->willReturn([$this->creditmemoItemMock, $this->creditmemoItemMock]);
        $this->creditmemoItemMock->expects($this->exactly(2))
            ->method('getHasChildren')
            ->willReturn(false);
        $this->creditmemoItemMock->expects($this->exactly(2))
            ->method('getBaseCost')
            ->willReturn(10);
        $this->creditmemoItemMock->expects($this->exactly(2))
            ->method('getQty')
            ->willReturn(2);
        $this->creditmemoMock->expects($this->once())
            ->method('setBaseCost')
            ->with(40)
            ->willReturnSelf();
        $this->assertEquals($this->total, $this->total->collect($this->creditmemoMock));
    }
}