{
  "name": "verify-datetime-errors-amount",
  "nodes": [
    {"id": "n1", "name": "Trigger", "type": "click-trigger", "position": {"x": 0, "y": 0}, "config": {}},
    {"id": "n2", "name": "Fixture", "type": "code", "position": {"x": 0, "y": 100},
     "config": {"code": "return { when: '2026-01-15T10:30:00Z' };"}},
    {"id": "n3", "name": "DatetimeBadAmount", "type": "datetime", "position": {"x": 0, "y": 200},
     "config": {"operation": "add", "inputField": "data.result.when", "amount": "3d", "unit": "days", "outputField": "value"}}
  ],
  "connections": [
    {"sourceNodeId": "n1", "sourceOutput": "main", "targetNodeId": "n2", "targetInput": "data"},
    {"sourceNodeId": "n2", "sourceOutput": "main", "targetNodeId": "n3", "targetInput": "data"}
  ],
  "expect": {
    "n3": {"status": "failed", "errorContains": "amount must be a number"}
  }
}