[
  {
      "description": "validation of duration strings",
      "schema": {"format": "duration"},
      "tests": [
          {
              "description": "a valid duration string",
              "data": "P4DT12H30M5S",
              "valid": true
          },
          {
              "description": "an invalid duration string",
              "data": "PT1D",
              "valid": false
          },
          {
              "description": "no elements present",
              "data": "P",
              "valid": false
          },
          {
              "description": "no time elements present",
              "data": "P1YT",
              "valid": false
          },
          {
              "description": "no date or time elements present",
              "data": "PT",
              "valid": false
          },
          {
              "description": "elements out of order",
              "data": "P2D1Y",
              "valid": false
          },
          {
              "description": "missing time separator",
              "data": "P1D2H",
              "valid": false
          },
          {
              "description": "time element in the date position",
              "data": "P2S",
              "valid": false
          },
          {
              "description": "four years duration",
              "data": "P4Y",
              "valid": true
          },
          {
              "description": "zero time, in seconds",
              "data": "PT0S",
              "valid": true
          },
          {
              "description": "zero time, in days",
              "data": "P0D",
              "valid": true
          },
          {
              "description": "one month duration",
              "data": "P1M",
              "valid": true
          },
          {
              "description": "one minute duration",
              "data": "PT1M",
              "valid": true
          },
          {
              "description": "one and a half days, in hours",
              "data": "PT36H",
              "valid": true
          },
          {
              "description": "one and a half days, in days and hours",
              "data": "P1DT12H",
              "valid": true
          },
          {
              "description": "two weeks",
              "data": "P2W",
              "valid": true
          },
          {
              "description": "weeks cannot be combined with other units",
              "data": "P1Y2W",
              "valid": false
          }
      ]
  }
]