Refactor infra tests, clean E2E step suites, and fix TS in tests

tests/unit/application/use-cases/ConfirmCheckoutUseCase.test.ts

@@ -23,7 +23,7 @@ describe('ConfirmCheckoutUseCase', () => {
     requestCheckoutConfirmation: Mock;
   };
   let mockPrice: CheckoutPrice;
-
+ 
   beforeEach(() => {
     mockCheckoutService = {
       extractCheckoutInfo: vi.fn(),
@@ -33,12 +33,12 @@ describe('ConfirmCheckoutUseCase', () => {
     mockConfirmationPort = {
       requestCheckoutConfirmation: vi.fn(),
     };
-
+ 
     mockPrice = {
       getAmount: vi.fn(() => 0.50),
       toDisplayString: vi.fn(() => '$0.50'),
       isZero: vi.fn(() => false),
-    };
+    } as unknown as CheckoutPrice;
   });
 
   describe('Success flow', () => {
@@ -230,11 +230,11 @@ describe('ConfirmCheckoutUseCase', () => {
 
   describe('Zero price warning', () => {
     it('should still require confirmation for $0.00 price', async () => {
-      const zeroPriceMock: CheckoutPrice = {
+      const zeroPriceMock = {
         getAmount: vi.fn(() => 0.00),
         toDisplayString: vi.fn(() => '$0.00'),
         isZero: vi.fn(() => true),
-      };
+      } as unknown as CheckoutPrice;
 
       const useCase = new ConfirmCheckoutUseCase(
         mockCheckoutService as unknown as ICheckoutService,
@@ -263,11 +263,11 @@ describe('ConfirmCheckoutUseCase', () => {
     });
 
     it('should proceed with checkout for zero price after confirmation', async () => {
-      const zeroPriceMock: CheckoutPrice = {
+      const zeroPriceMock = {
         getAmount: vi.fn(() => 0.00),
         toDisplayString: vi.fn(() => '$0.00'),
         isZero: vi.fn(() => true),
-      };
+      } as unknown as CheckoutPrice;
 
       const useCase = new ConfirmCheckoutUseCase(
         mockCheckoutService as unknown as ICheckoutService,