RegularPriceTest.php

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<?php
namespace Magento\Catalog\Test\Unit\Pricing\Price;

use \Magento\Catalog\Pricing\Price\RegularPrice;

class RegularPriceTest extends \PHPUnit\Framework\TestCase
{
    protected $regularPrice;

    protected $priceInfoMock;

    protected $saleableItemMock;

    protected $calculatorMock;

    protected $priceCurrencyMock;

    protected function setUp()
    {
        $qty = 1;
        $this->saleableItemMock = $this->createMock(\Magento\Catalog\Model\Product::class);
        $this->priceInfoMock = $this->createMock(\Magento\Framework\Pricing\PriceInfo\Base::class);
        $this->calculatorMock = $this->createMock(\Magento\Framework\Pricing\Adjustment\Calculator::class);

        $this->saleableItemMock->expects($this->once())
            ->method('getPriceInfo')
            ->will($this->returnValue($this->priceInfoMock));

        $this->priceCurrencyMock = $this->createMock(\Magento\Framework\Pricing\PriceCurrencyInterface::class);

        $this->regularPrice = new RegularPrice(
            $this->saleableItemMock,
            $qty,
            $this->calculatorMock,
            $this->priceCurrencyMock
        );
    }

    public function testGetValue($price)
    {
        $convertedPrice = 85;
        $this->saleableItemMock->expects($this->once())
            ->method('getPrice')
            ->will($this->returnValue($price));
        $this->priceCurrencyMock->expects($this->any())
            ->method('convertAndRound')
            ->with($price)
            ->will($this->returnValue($convertedPrice));
        $this->assertEquals($convertedPrice, $this->regularPrice->getValue());
        //The second call will use cached value
        $this->assertEquals($convertedPrice, $this->regularPrice->getValue());
    }

    public function testGetValueDataProvider()
    {
        return [
            'With price' => [100.00],
            'Without price' => [false]
        ];
    }

    public function testGetAmount()
    {
        $priceValue = 77;
        $convertedPrice = 56.32;
        $amountValue = 88;

        $this->saleableItemMock->expects($this->once())
            ->method('getPrice')
            ->will($this->returnValue($priceValue));
        $this->priceCurrencyMock->expects($this->any())
            ->method('convertAndRound')
            ->with($priceValue)
            ->will($this->returnValue($convertedPrice));
        $this->calculatorMock->expects($this->once())
            ->method('getAmount')
            ->with($this->equalTo($convertedPrice))
            ->will($this->returnValue($amountValue));
        $this->assertEquals($amountValue, $this->regularPrice->getAmount());
    }

    public function testGetPriceCode()
    {
        $this->assertEquals(RegularPrice::PRICE_CODE, $this->regularPrice->getPriceCode());
    }
}