TaxProviderProcessor example

new Criteria(),
            Context::createDefaultContext()
        );

        $taxProviderRegistry = new TaxProviderRegistry([
            new TestConstantTaxRateProvider(),
        ]);

        $repo = static::createMock(EntityRepository::class);
        $repo->method('search')->willReturn($result);

        $processor = new TaxProviderProcessor(
            $repo,
            static::createMock(LoggerInterface::class),
            $this->adjustment,
            $taxProviderRegistry,
            static::createMock(TaxProviderPayloadService::class)
        );

        $processor->process($cart, $salesChannelContext);

        $lineItem = $cart->getLineItems()->get($this->ids->get('line-item-1'));
        $delivery = $cart->getDeliveries()->first();