[

{
  "description": "validation of null and format",
  "schema": {"type": ["null", "string"], "format": "date-time"},
  "tests": [
    {
      "description": "a valid date-time string",
      "data": "1963-06-19T08:30:06.283185Z",
      "valid": true
    },
    {
      "description": "allow null",
      "data": null,
      "valid": true
    }
  ]
}

]