minecraft-assets/assets/minecraft/items/test_block.json

{
  "model": {
    "type": "minecraft:select",
    "block_state_property": "mode",
    "cases": [
      {
        "model": {
          "type": "minecraft:model",
          "model": "minecraft:block/test_block_log"
        },
        "when": "log"
      },
      {
        "model": {
          "type": "minecraft:model",
          "model": "minecraft:block/test_block_fail"
        },
        "when": "fail"
      },
      {
        "model": {
          "type": "minecraft:model",
          "model": "minecraft:block/test_block_accept"
        },
        "when": "accept"
      }
    ],
    "fallback": {
      "type": "minecraft:model",
      "model": "minecraft:block/test_block_start"
    },
    "property": "minecraft:block_state"
  }
}