{
  "version": 8,
  "sources": {
    "source1": {
      "type": "geojson",
      "data": {
        "type": "Point",
        "coordinates": [
          0,
          0
        ]
      }
    },
    "source2": {
      "type": "geojson",
      "data": {
        "type": "Point",
        "coordinates": [
          0,
          0
        ]
      }
    },
    "source3": {
      "type": "geojson",
      "data": {
        "type": "Point",
        "coordinates": [
          0,
          0
        ]
      }
    }
  },
  "layers": [
    {
      "id": "layer1",
      "type": "symbol",
      "source": "source1",
      "layout": {
        "icon-image": "test-icon"
      }
    },
    {
      "id": "layer2",
      "type": "symbol",
      "source": "source2",
      "layout": {
        "icon-image": "test-icon"
      }
    },
    {
      "id": "layer3",
      "type": "symbol",
      "source": "source3",
      "layout": {
        "icon-image": "test-icon"
      }
    }
  ]
}