defmodule MinmaxlistTest do
  use ExUnit.Case
  doctest Minmaxlist

  test "the truth" do
    import Minmaxlist
    dataset = [
      %{name: "A", age: 24, income: 4000},
      %{name: "B", age: 22, income: 3300},
      %{name: "C", age: 22, income: 2800},
      %{name: "D", age: 25, income: 5000},
      %{name: "E", age: 22, income: 3300},
      %{name: "F", age: 25, income: 5500},
      %{name: "G", age: 24, income: 4500},
    ]

    result = dataset |> min_list_by(&(&1.age)) |> max_list_by(&(&1.income))
    assert result == [%{name: "B", age: 22, income: 3300}, %{name: "E", age: 22, income: 3300}]

    result = dataset |> min_max_list_by(&(&1.age))
    assert result == {
      [%{name: "B", age: 22, income: 3300}, %{name: "C", age: 22, income: 2800}, %{name: "E", age: 22, income: 3300}],
      [%{name: "D", age: 25, income: 5000}, %{name: "F", age: 25, income: 5500}]
    }
  end
end