[
  {
    "description": "properties: async + sync",
    "schema": {
      "$async": true,
      "properties": {
        "foo": {
          "type": "integer",
          "idExists": { "table": "users" }
        },
        "bar": {
          "type": "integer"
        }
      }
    },
    "tests": [
      {
        "description": "valid object",
        "data": { "foo": 1, "bar": 2 },
        "valid": true
      },
      {
        "description": "another valid object",
        "data": { "foo": 5, "bar": 2 },
        "valid": true
      },
      {
        "description": "invalid sync property",
        "data": { "foo": 1, "bar": "abc" },
        "valid": false
      },
      {
        "description": "invalid async property",
        "data": { "foo": 9, "bar": 2 },
        "valid": false
      }
    ]
  }
]