{
  "synthetic": true,
  "function": "cubic",
  "scope": "Finite offline teaching cases only; no live account/platform access.",
  "cases": [
    {
      "id": 1,
      "args": [
        [
          40,
          30,
          20
        ],
        250,
        2
      ],
      "expected": {
        "volume": 0.024,
        "cubic": 6,
        "modelMass": 6
      }
    },
    {
      "id": 2,
      "args": [
        [
          40,
          30,
          20
        ],
        null,
        2
      ],
      "expected": null
    }
  ]
}