{
  "fixtures": [
    {
      "name": "transform_returns_non_dict",
      "description": "Wrapped transform function returns a string instead of a dict",
      "input": {
        "transform_name": "normalize_output",
        "input_schema": {"type": "object", "properties": {"name": {"type": "string"}}},
        "transform_result": "not_a_dict"
      },
      "expected_error": "transform 'normalize_output' returned invalid schema: expected dict, got str"
    },
    {
      "name": "transform_returns_missing_type",
      "description": "Transform result is missing the required 'type' field in schema",
      "input": {
        "transform_name": "enrich_schema",
        "input_schema": {"type": "object", "properties": {"id": {"type": "integer"}}},
        "transform_result": {"properties": {"id": {"type": "integer"}}}
      },
      "expected_error": "transform 'enrich_schema' returned schema without 'type' field"
    },
    {
      "name": "transform_returns_invalid_type_value",
      "description": "Transform result has an unrecognized JSON schema type",
      "input": {
        "transform_name": "custom_transform",
        "input_schema": {"type": "object"},
        "transform_result": {"type": "hashmap", "properties": {}}
      },
      "expected_error": "transform 'custom_transform' returned unknown schema type: hashmap"
    },
    {
      "name": "transform_adds_circular_ref",
      "description": "Transform introduces a circular $ref in the schema",
      "input": {
        "transform_name": "ref_injector",
        "input_schema": {"type": "object", "properties": {"data": {"type": "string"}}},
        "transform_result": {
          "type": "object",
          "properties": {
            "data": {"$ref": "#/properties/data"}
          }
        }
      },
      "expected_error": "transform 'ref_injector' introduced circular reference in schema"
    },
    {
      "name": "transform_returns_null_schema",
      "description": "Transform returns null/None instead of a valid schema",
      "input": {
        "transform_name": "null_transform",
        "input_schema": {"type": "object"},
        "transform_result": null
      },
      "expected_error": "transform 'null_transform' returned null schema"
    },
    {
      "name": "transform_corrupts_required_array",
      "description": "Transform returns schema with non-string elements in 'required' array",
      "input": {
        "transform_name": "bad_required_transform",
        "input_schema": {"type": "object", "required": ["name"]},
        "transform_result": {
          "type": "object",
          "required": [1, null, true],
          "properties": {"name": {"type": "string"}}
        }
      },
      "expected_error": "transform 'bad_required_transform' corrupted 'required' array: elements must be strings"
    }
  ]
}