divkit/test_data/expression_test_data/operations_sum_string.json

{
  "cases": [
    {
      "name": "a + b => ab",
      "expression": "@{'a' + 'b'}",
      "expected": {
        "type": "string",
        "value": "ab"
      },
      "variables": [],
      "platforms": [
        "android",
        "ios",
        "web"
      ]
    }
  ]
}