[
  {
    "name": "85 t of wheat from 10 ha is 8.5 t/ha and 3.44 t/acre",
    "args": [
      "85",
      "10",
      "ha",
      2
    ],
    "expect": {
      "perHectare": "8.5",
      "perAcre": "3.44",
      "hectares": "10",
      "acres": "24.71"
    }
  },
  {
    "name": "250 t from 100 acres is 2.5 t/acre and 6.18 t/ha",
    "args": [
      "250",
      "100",
      "acre",
      2
    ],
    "expect": {
      "perHectare": "6.18",
      "perAcre": "2.5",
      "hectares": "40.47",
      "acres": "100"
    }
  },
  {
    "name": "a fractional harvest from a fractional area, to three places",
    "args": [
      "12.345",
      "1.5",
      "ha",
      3
    ],
    "expect": {
      "perHectare": "8.23",
      "perAcre": "3.331",
      "hectares": "1.5",
      "acres": "3.707"
    }
  },
  {
    "name": "a trial plot in square metres",
    "args": [
      "500",
      "2500",
      "m2",
      2
    ],
    "expect": {
      "perHectare": "2000",
      "perAcre": "809.37",
      "hectares": "0.25",
      "acres": "0.62"
    }
  },
  {
    "name": "1.005 t/ha rounds half up to 1.01, where a float says 1.00",
    "args": [
      "1.005",
      "1",
      "ha",
      2
    ],
    "expect": {
      "perHectare": "1.01",
      "perAcre": "0.41",
      "hectares": "1",
      "acres": "2.47"
    }
  },
  {
    "name": "nothing harvested is zero per hectare",
    "args": [
      "0",
      "3.2",
      "ha",
      2
    ],
    "expect": {
      "perHectare": "0",
      "perAcre": "0",
      "hectares": "3.2",
      "acres": "7.91"
    }
  },
  {
    "name": "zero decimals rounds to whole numbers, half up",
    "args": [
      "7",
      "3",
      "ha",
      0
    ],
    "expect": {
      "perHectare": "2",
      "perAcre": "1",
      "hectares": "3",
      "acres": "7"
    }
  },
  {
    "name": "a garden plot in square feet: 9.7 kg from 30.25 ft² is exactly 13968 kg/acre",
    "args": [
      "9.7",
      "30.25",
      "ft2",
      4
    ],
    "expect": {
      "perHectare": "34515.6797",
      "perAcre": "13968",
      "hectares": "0.0003",
      "acres": "0.0007"
    }
  },
  {
    "name": "trailing zeros are trimmed and leading zeros accepted",
    "args": [
      "085.000",
      "010",
      "ha",
      3
    ],
    "expect": {
      "perHectare": "8.5",
      "perAcre": "3.44",
      "hectares": "10",
      "acres": "24.711"
    }
  },
  {
    "name": "zero area is an error",
    "args": [
      "85",
      "0",
      "ha",
      2
    ],
    "expectError": "area must be greater than zero"
  },
  {
    "name": "a unit that is not an area is an error",
    "args": [
      "85",
      "10",
      "kg",
      2
    ],
    "expectError": "cannot convert kg (mass) to m2 (area)"
  },
  {
    "name": "an unknown unit is an error",
    "args": [
      "85",
      "10",
      "hectare",
      2
    ],
    "expectError": "unknown unit \"hectare\""
  },
  {
    "name": "a negative quantity is an error",
    "args": [
      "-5",
      "10",
      "ha",
      2
    ],
    "expectError": "quantity must be plain non-negative decimal text"
  },
  {
    "name": "exponent notation is an error",
    "args": [
      "1e3",
      "10",
      "ha",
      2
    ],
    "expectError": "quantity must be plain non-negative decimal text"
  },
  {
    "name": "more than 12 significant digits is an error",
    "args": [
      "1234567890123",
      "10",
      "ha",
      2
    ],
    "expectError": "has too many digits"
  },
  {
    "name": "more than 6 decimal places is an error",
    "args": [
      "85",
      "10.1234567",
      "ha",
      2
    ],
    "expectError": "has too many digits"
  },
  {
    "name": "decimals above 12 is an error",
    "args": [
      "85",
      "10",
      "ha",
      13
    ],
    "expectError": "decimals must be a whole number from 0 to 12"
  },
  {
    "name": "a trailing newline after quantity is not plain decimal text",
    "args": [
      "12.5\n",
      "10",
      "ha",
      2
    ],
    "expectError": "quantity must be plain non-negative decimal text"
  },
  {
    "name": "a trailing newline after area is not plain decimal text",
    "args": [
      "5",
      "10\n",
      "ha",
      2
    ],
    "expectError": "area must be plain non-negative decimal text"
  }
]