remove companion tests

apps/api/src/domain/sponsor/SponsorService.test.ts

@@ -528,22 +528,21 @@ describe('SponsorService', () => {
 
   describe('getSponsorBilling', () => {
     it('returns billing data', async () => {
-      // Mock the use case to set up the presenter
-      getSponsorBillingUseCase.execute.mockImplementation(async () => {
-        sponsorBillingPresenter.present({
+      // Mock the use case to return billing data directly
+      getSponsorBillingUseCase.execute.mockResolvedValue(
+        Result.ok({
           paymentMethods: [],
           invoices: [],
           stats: {
             totalSpent: 0,
             pendingAmount: 0,
-            nextPaymentDate: '',
-            nextPaymentAmount: 0,
+            nextPaymentDate: null,
+            nextPaymentAmount: null,
             activeSponsorships: 0,
             averageMonthlySpend: 0,
           },
-        });
-        return Result.ok(undefined);
-      });
+        })
+      );
 
       const result = await service.getSponsorBilling('s1');