{
  "name": "verify-merge-errors",
  "nodes": [
    {"id": "n1", "name": "Trigger", "type": "click-trigger", "position": {"x": 0, "y": 0}, "config": {}},
    {"id": "a", "name": "BranchA", "type": "code", "position": {"x": -100, "y": 100},
     "config": {"code": "return [{name: 'no-id-one'}, {name: 'no-id-two'}];"}},
    {"id": "b", "name": "BranchB", "type": "code", "position": {"x": 100, "y": 100},
     "config": {"code": "return [{id: 1, name: 'one'}];"}},
    {"id": "m", "name": "Merge", "type": "merge", "position": {"x": 0, "y": 220},
     "config": {"mode": "combine-by-key", "key": "id", "path1": "result", "path2": "result"}}
  ],
  "connections": [
    {"sourceNodeId": "n1", "sourceOutput": "main", "targetNodeId": "a", "targetInput": "data"},
    {"sourceNodeId": "n1", "sourceOutput": "main", "targetNodeId": "b", "targetInput": "data"},
    {"sourceNodeId": "a", "sourceOutput": "main", "targetNodeId": "m", "targetInput": "input1"},
    {"sourceNodeId": "b", "sourceOutput": "main", "targetNodeId": "m", "targetInput": "input2"}
  ],
  "expect": {
    "m": {"status": "failed", "errorContains": "an item in input1 has no \"id\" to combine on"}
  }
}