integration tests

tests/integration/onboarding/complete-onboarding/complete-onboarding-validation.test.ts

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+import { describe, it, expect, beforeEach } from 'vitest';
+import { OnboardingTestContext } from '../OnboardingTestContext';
+
+describe('CompleteDriverOnboardingUseCase - Validation & Errors', () => {
+  let context: OnboardingTestContext;
+
+  beforeEach(async () => {
+    context = OnboardingTestContext.create();
+    await context.clear();
+  });
+
+  it('should reject onboarding if driver already exists', async () => {
+    // Scenario: Already onboarded user
+    // Given: A driver already exists for the user
+    const userId = 'existing-user';
+    const existingInput = {
+      userId,
+      firstName: 'Old',
+      lastName: 'Name',
+      displayName: 'OldRacer',
+      country: 'DE',
+    };
+    await context.completeDriverOnboardingUseCase.execute(existingInput);
+
+    // When: CompleteDriverOnboardingUseCase.execute() is called again for same user
+    const result = await context.completeDriverOnboardingUseCase.execute({
+      userId,
+      firstName: 'New',
+      lastName: 'Name',
+      displayName: 'NewRacer',
+      country: 'FR',
+    });
+
+    // Then: Should return DRIVER_ALREADY_EXISTS error
+    expect(result.isErr()).toBe(true);
+    const error = result.unwrapErr();
+    expect(error.code).toBe('DRIVER_ALREADY_EXISTS');
+  });
+
+  it('should handle repository errors gracefully', async () => {
+    // Scenario: Repository error
+    // Given: Repository throws an error
+    const userId = 'error-user';
+    const originalCreate = context.driverRepository.create.bind(context.driverRepository);
+    context.driverRepository.create = async () => {
+      throw new Error('Database failure');
+    };
+
+    // When: CompleteDriverOnboardingUseCase.execute() is called
+    const result = await context.completeDriverOnboardingUseCase.execute({
+      userId,
+      firstName: 'John',
+      lastName: 'Doe',
+      displayName: 'RacerJohn',
+      country: 'US',
+    });
+
+    // Then: Should return REPOSITORY_ERROR
+    expect(result.isErr()).toBe(true);
+    const error = result.unwrapErr();
+    expect(error.code).toBe('REPOSITORY_ERROR');
+    expect(error.details.message).toBe('Database failure');
+
+    // Restore
+    context.driverRepository.create = originalCreate;
+  });
+});