Potentially same question has been asked but differently.

You are testing something in isolation and assume no access to generated folder.

Helper method

class HelperClass extends AbstractHelper

    public function __construct(
        Context $context,
        CurrencyFactory $currencyFactory
    ) {
        $this->currencyFactory = $currencyFactory;


     * Format price with symbol
     * @param float $price
     * @param string $symbol
     * @return string
    public function formatPrice(float $price, string $symbol): string
        return $this->currencyFactory
                ['symbol' => $symbol],

Unit test

    public function setUp(): void
        $this->currencyMock = $this->createMock(Currency::class);

        $this->currencyFactoryMock = $this->getMockBuilder(CurrencyFactory::class)


        $this->helper = new HelperClass(

    public function testFormatPrice()
        $this->assertEquals('£2.23', $this->helper->formatPrice((float) 2.2294, '£'));

Error: HelperClass::formatPrice() must be of the type string, null returned

Is there just no way of testing generated classes without them existing?

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