13.33Testing Scatter-Gather

Production:

Scatter-Gather
 ┌─────┼─────┐
 ↓     ↓     ↓
SF  Billing Loyalty

MUnit:

mock all three downstream boundaries

Test success:

SF      → Acme
Billing → 100
Loyalty → Gold

Verify aggregated response:

{
  "name": "Acme",
  "balance": 100,
  "loyaltyLevel": "Gold"
}