test(sso): default-mock discovery fetch so intent is explicit

Author: waleedlatif1

apps/sim/app/api/auth/sso/register/route.test.ts

@@ -114,6 +114,7 @@ describe('POST /api/auth/sso/register', () => {
     mockGetSession.mockResolvedValue({ user: { id: 'u1' } })
     mockHasSSOAccess.mockResolvedValue(true)
     mockValidateUrlWithDNS.mockResolvedValue({ isValid: true, resolvedIP: '1.2.3.4' })
+    mockSecureFetchWithPinnedIP.mockRejectedValue(new Error('discovery not mocked for this test'))
     mockRegisterSSOProvider.mockResolvedValue({ providerId: 'acme-oidc' })
   })