diff --git a/core/admin/domain/errors/AdminDomainError.ts b/core/admin/domain/errors/AdminDomainError.ts
index 00046fe4b..12cba6f0f 100644
--- a/core/admin/domain/errors/AdminDomainError.ts
+++ b/core/admin/domain/errors/AdminDomainError.ts
@@ -7,6 +7,7 @@ export abstract class AdminDomainError extends Error implements DomainError<Comm
 
   constructor(message: string) {
     super(message);
+    this.name = 'AdminDomainError';
     Object.setPrototypeOf(this, new.target.prototype);
   }
 }
@@ -19,6 +20,7 @@ export class AdminDomainValidationError
 
   constructor(message: string) {
     super(message);
+    this.name = 'AdminDomainValidationError';
   }
 }
 
@@ -30,6 +32,7 @@ export class AdminDomainInvariantError
 
   constructor(message: string) {
     super(message);
+    this.name = 'AdminDomainInvariantError';
   }
 }
 
@@ -41,5 +44,6 @@ export class AuthorizationError
 
   constructor(message: string) {
     super(message);
+    this.name = 'AuthorizationError';
   }
 }
\ No newline at end of file
diff --git a/core/dashboard/application/use-cases/GetDashboardUseCase.test.ts b/core/dashboard/application/use-cases/GetDashboardUseCase.test.ts
index 18918aa40..af803b2a1 100644
--- a/core/dashboard/application/use-cases/GetDashboardUseCase.test.ts
+++ b/core/dashboard/application/use-cases/GetDashboardUseCase.test.ts
@@ -209,7 +209,7 @@ describe('GetDashboardUseCase', () => {
           id: 'race-2',
           trackName: 'Track B',
           carType: 'GT3',
-          scheduledDate: new Date('2026-01-25T10:00:00.000Z'), // Future
+          scheduledDate: new Date('2026-01-26T10:00:00.000Z'), // Future
         },
       ] as RaceData[]);
 
@@ -295,13 +295,13 @@ describe('GetDashboardUseCase', () => {
           id: 'race-1',
           trackName: 'Track A',
           carType: 'GT3',
-          scheduledDate: new Date('2026-01-25T10:00:00.000Z'),
+          scheduledDate: new Date('2026-01-26T10:00:00.000Z'),
         },
         {
           id: 'race-2',
           trackName: 'Track B',
           carType: 'GT4',
-          scheduledDate: new Date('2026-01-26T10:00:00.000Z'),
+          scheduledDate: new Date('2026-01-27T10:00:00.000Z'),
         },
       ] as RaceData[]);
 
diff --git a/core/health/use-cases/CheckApiHealthUseCase.ts b/core/health/use-cases/CheckApiHealthUseCase.ts
index e48e1d49e..b2b6743ea 100644
--- a/core/health/use-cases/CheckApiHealthUseCase.ts
+++ b/core/health/use-cases/CheckApiHealthUseCase.ts
@@ -34,15 +34,21 @@ export class CheckApiHealthUseCase {
           timestamp: result.timestamp,
         });
       } else {
+        const error = result.error || 'Unknown error';
         await eventPublisher.publishHealthCheckFailed({
-          error: result.error || 'Unknown error',
+          error,
           timestamp: result.timestamp,
         });
+        // Return result with error property
+        return {
+          ...result,
+          error,
+        };
       }
 
       return result;
     } catch (error) {
-      const errorMessage = error instanceof Error ? error.message : 'Unknown error';
+      const errorMessage = error instanceof Error ? error.message : (error ? String(error) : 'Unknown error');
       const timestamp = new Date();
 
       // Emit failed event
diff --git a/core/payments/application/use-cases/GetSponsorBillingUseCase.test.ts b/core/payments/application/use-cases/GetSponsorBillingUseCase.test.ts
index a2d843273..b1513ca1e 100644
--- a/core/payments/application/use-cases/GetSponsorBillingUseCase.test.ts
+++ b/core/payments/application/use-cases/GetSponsorBillingUseCase.test.ts
@@ -5,11 +5,13 @@ import { describe, expect, it, vi, type Mock } from 'vitest';
 import type { Payment } from '../../domain/entities/Payment';
 import { PayerType, PaymentStatus, PaymentType } from '../../domain/entities/Payment';
 import type { PaymentRepository } from '../../domain/repositories/PaymentRepository';
+import type { SponsorRepository } from '@core/racing/domain/repositories/SponsorRepository';
 import { GetSponsorBillingUseCase, type GetSponsorBillingInput } from './GetSponsorBillingUseCase';
 
 describe('GetSponsorBillingUseCase', () => {
   let paymentRepository: { findByFilters: Mock };
   let seasonSponsorshipRepository: { findBySponsorId: Mock };
+  let sponsorRepository: { findById: Mock };
   let useCase: GetSponsorBillingUseCase;
 
   beforeEach(() => {
@@ -21,15 +23,26 @@ describe('GetSponsorBillingUseCase', () => {
       findBySponsorId: vi.fn(),
     };
 
+    sponsorRepository = {
+      findById: vi.fn(),
+    };
+
     useCase = new GetSponsorBillingUseCase(
       paymentRepository as unknown as PaymentRepository,
       seasonSponsorshipRepository as unknown as SeasonSponsorshipRepository,
+      sponsorRepository as unknown as SponsorRepository,
     );
   });
 
   it('derives invoices and stats from payments and sponsorships', async () => {
     const sponsorId = 'sponsor-1';
 
+    // Mock sponsor exists
+    sponsorRepository.findById.mockResolvedValue({
+      id: sponsorId,
+      name: 'Test Sponsor',
+    });
+
     const payments: Payment[] = [
       {
         id: 'pay-1',
diff --git a/core/racing/domain/entities/result/Position.ts b/core/racing/domain/entities/result/Position.ts
index 9583f7e37..58d592ecb 100644
--- a/core/racing/domain/entities/result/Position.ts
+++ b/core/racing/domain/entities/result/Position.ts
@@ -4,8 +4,8 @@ export class Position {
   private constructor(private readonly value: number) {}
 
   static create(value: number): Position {
-    if (!Number.isInteger(value) || value < 0) {
-      throw new RacingDomainValidationError('Position must be a non-negative integer');
+    if (!Number.isInteger(value) || value <= 0) {
+      throw new RacingDomainValidationError('Position must be a positive integer');
     }
     return new Position(value);
   }
diff --git a/core/racing/domain/entities/result/Result.test.ts b/core/racing/domain/entities/result/Result.test.ts
index d2ad88f0f..ea0d1cc47 100644
--- a/core/racing/domain/entities/result/Result.test.ts
+++ b/core/racing/domain/entities/result/Result.test.ts
@@ -26,6 +26,7 @@ describe('Result', () => {
         fastestLap: validFastestLap,
         incidents: validIncidents,
         startPosition: validStartPosition,
+        points: 10,
       };
 
       const result = Result.create(props);
@@ -37,6 +38,7 @@ describe('Result', () => {
       expect(result.fastestLap.toNumber()).toBe(validFastestLap);
       expect(result.incidents.toNumber()).toBe(validIncidents);
       expect(result.startPosition.toNumber()).toBe(validStartPosition);
+      expect(result.points).toBe(10);
     });
 
     it('should throw error for empty id', () => {
@@ -48,6 +50,7 @@ describe('Result', () => {
         fastestLap: validFastestLap,
         incidents: validIncidents,
         startPosition: validStartPosition,
+        points: 10,
       };
 
       expect(() => Result.create(props)).toThrow(RacingDomainValidationError);
@@ -62,6 +65,7 @@ describe('Result', () => {
         fastestLap: validFastestLap,
         incidents: validIncidents,
         startPosition: validStartPosition,
+        points: 10,
       };
 
       expect(() => Result.create(props)).toThrow(RacingDomainValidationError);