13.9Complete mental example

TEST
│
├── Behavior
│     └── Mock Salesforce Upsert
│             → id=001ABC
│
├── Execution
│     ├── Set request payload
│     └── Call process-customer-flow
│
└── Validation
      ├── customerId == C001
      ├── salesforceId == 001ABC
      └── success == true

That's MUnit in one picture.