{
  "description": "Confirm error thrown when options.length is not a number",
  "expr": "$truncate('1234567890123456789012345678901234567890', { 'length' : 'test'} )",
  "dataset": "empty",
  "bindings": {},
  "error": {
    "message": "Expected a number. Received options.length=test Type: string"
  }
}