canonical-data.json

{
  "exercise": "palindrome-products",
  "cases": [
    {
      "uuid": "5cff78fe-cf02-459d-85c2-ce584679f887",
      "description": "find the smallest palindrome from single digit factors",
      "property": "smallest",
      "input": {
        "min": 1,
        "max": 9
      },
      "expected": {
        "value": 1,
        "factors": [[1, 1]]
      }
    },
    {
      "uuid": "0853f82c-5fc4-44ae-be38-fadb2cced92d",
      "description": "find the largest palindrome from single digit factors",
      "property": "largest",
      "input": {
        "min": 1,
        "max": 9
      },
      "expected": {
        "value": 9,
        "factors": [
          [1, 9],
          [3, 3]
        ]
      }
    },
    {
      "uuid": "66c3b496-bdec-4103-9129-3fcb5a9063e1",
      "description": "find the smallest palindrome from double digit factors",
      "property": "smallest",
      "input": {
        "min": 10,
        "max": 99
      },
      "expected": {
        "value": 121,
        "factors": [[11, 11]]
      }
    },
    {
      "uuid": "a10682ae-530a-4e56-b89d-69664feafe53",
      "description": "find the largest palindrome from double digit factors",
      "property": "largest",
      "input": {
        "min": 10,
        "max": 99
      },
      "expected": {
        "value": 9009,
        "factors": [[91, 99]]
      }
    },
    {
      "uuid": "cecb5a35-46d1-4666-9719-fa2c3af7499d",
      "description": "find the smallest palindrome from triple digit factors",
      "property": "smallest",
      "input": {
        "min": 100,
        "max": 999
      },
      "expected": {
        "value": 10201,
        "factors": [[101, 101]]
      }
    },
    {
      "uuid": "edab43e1-c35f-4ea3-8c55-2f31dddd92e5",
      "description": "find the largest palindrome from triple digit factors",
      "property": "largest",
      "input": {
        "min": 100,
        "max": 999
      },
      "expected": {
        "value": 906609,
        "factors": [[913, 993]]
      }
    },
    {
      "uuid": "4f802b5a-9d74-4026-a70f-b53ff9234e4e",
      "description": "find the smallest palindrome from four digit factors",
      "property": "smallest",
      "input": {
        "min": 1000,
        "max": 9999
      },
      "expected": {
        "value": 1002001,
        "factors": [[1001, 1001]]
      }
    },
    {
      "uuid": "787525e0-a5f9-40f3-8cb2-23b52cf5d0be",
      "description": "find the largest palindrome from four digit factors",
      "property": "largest",
      "input": {
        "min": 1000,
        "max": 9999
      },
      "expected": {
        "value": 99000099,
        "factors": [[9901, 9999]]
      }
    },
    {
      "uuid": "58fb1d63-fddb-4409-ab84-a7a8e58d9ea0",
      "description": "empty result for smallest if no palindrome in the range",
      "property": "smallest",
      "input": {
        "min": 1002,
        "max": 1003
      },
      "expected": {
        "value": null,
        "factors": []
      }
    },
    {
      "uuid": "9de9e9da-f1d9-49a5-8bfc-3d322efbdd02",
      "description": "empty result for largest if no palindrome in the range",
      "property": "largest",
      "input": {
        "min": 15,
        "max": 15
      },
      "expected": {
        "value": null,
        "factors": []
      }
    },
    {
      "uuid": "12e73aac-d7ee-4877-b8aa-2aa3dcdb9f8a",
      "description": "error result for smallest if min is more than max",
      "property": "smallest",
      "input": {
        "min": 10000,
        "max": 1
      },
      "expected": {
        "error": "min must be <= max"
      }
    },
    {
      "uuid": "eeeb5bff-3f47-4b1e-892f-05829277bd74",
      "description": "error result for largest if min is more than max",
      "property": "largest",
      "input": {
        "min": 2,
        "max": 1
      },
      "expected": {
        "error": "min must be <= max"
      }
    },
    {
      "uuid": "16481711-26c4-42e0-9180-e2e4e8b29c23",
      "description": "smallest product does not use the smallest factor",
      "comments": [
        "This test catches code which assumes the smallest product is the product which uses the smallest factor.",
        "e.g. `for x in (min_factor .. max_factor) for y in (min_factor .. max_factor) if palindrome(x, y) return [x * y, [x, y]]`",
        "All the other tests pass when using logic like that, i.e. the other tests check for palindrome product but do not always test for the _smallest_ product"
      ],
      "property": "smallest",
      "input": {
        "min": 3215,
        "max": 4000
      },
      "expected": {
        "value": 10988901,
        "factors": [[3297, 3333]]
      }
    }
  ]
}