{
  "name": "verify-form-submit",
  "nodes": [
    {"id": "n1", "name": "Form", "type": "form-trigger", "position": {"x": 0, "y": 0},
     "config": {"title": "Upload", "responseMode": "wait",
                "fields": [
                  {"name": "caption", "label": "Caption", "type": "text"},
                  {"name": "image", "label": "Image", "type": "file", "required": true}
                ]}},
    {"id": "n2", "name": "Respond", "type": "respond-to-webhook", "position": {"x": 0, "y": 100},
     "config": {"status": 200, "bodySource": "json",
                "body": "{\"caption\": \"{{$node['Form'].form.caption}}\", \"mime\": \"{{$node['Form'].form.image.mimeType}}\", \"kind\": \"{{$node['Form'].form.image.type}}\", \"size\": {{$node['Form'].form.image.size}}}",
                "contentType": "application/json"}}
  ],
  "connections": [
    {"sourceNodeId": "n1", "sourceOutput": "main", "targetNodeId": "n2", "targetInput": "data"}
  ],
  "http": {
    "method": "POST",
    "path": "/webhook/{workflowId}",
    "multipart": {"fields": {"caption": "a small square"},
                  "files": {"image": {"filename": "square.png", "contentType": "image/png"}}},
    "expectStatus": 200,
    "expectBodyContains": ["\"caption\":\"a small square\"", "\"mime\":\"image/png\"", "\"kind\":\"binary\""],
    "expectBodyExcludes": ["\"size\":0"]
  }
}