10 files declare their use of OrderItemType in Commerce Core 8.2

CanadianSalesTaxTest.php in modules/tax/tests/src/Kernel/Plugin/Commerce/TaxType/CanadianSalesTaxTest.php

CartCouponRedemptionElementTest.php in modules/promotion/tests/src/FunctionalJavascript/CartCouponRedemptionElementTest.php

CouponRedemptionElementTest.php in modules/promotion/tests/src/FunctionalJavascript/CouponRedemptionElementTest.php

CouponRedemptionPaneTest.php in modules/promotion/tests/src/FunctionalJavascript/CouponRedemptionPaneTest.php

DefaultPaymentAdminTest.php in modules/payment/tests/src/Functional/DefaultPaymentAdminTest.php

EuropeanUnionVatTest.php in modules/tax/tests/src/Kernel/Plugin/Commerce/TaxType/EuropeanUnionVatTest.php

ManualPaymentAdminTest.php in modules/payment/tests/src/Functional/ManualPaymentAdminTest.php

OrderItemTypeTest.php in modules/order/tests/src/Functional/OrderItemTypeTest.php

OrderKernelTestBase.php in modules/order/tests/src/Kernel/OrderKernelTestBase.php

ProductTypeTest.php in modules/product/tests/src/Functional/ProductTypeTest.php