defmodule CharsetDetectTest do
  use ExUnit.Case
  doctest CharsetDetect

  list = %{
    big5: "Big5",
    cp932: "Shift_JIS",
    eucjp: "EUC-JP",
    gbk: "GBK",
    jis: "ISO-2022-JP",
    sjis: "Shift_JIS",
    utf8: "UTF-8"
  }

  describe "guess/1" do
    list
    |> Enum.each(fn {input, result} ->
      @input input
      @result result

      test "#{input} encoding" do
        assert {:ok, @result} = CharsetDetect.guess(File.read!("test/assets/#{@input}.txt"))
      end
    end)

    test "empty string" do
      assert {:ok, "UTF-8"} = CharsetDetect.guess("")
    end

    test "nil" do
      assert {:error, "invalid argument"} = CharsetDetect.guess(nil)
    end
  end

  describe "guess!/1" do
    list
    |> Enum.each(fn {input, result} ->
      @input input
      @result result

      test "#{input} encoding" do
        assert @result = CharsetDetect.guess!(File.read!("test/assets/#{@input}.txt"))
      end
    end)

    test "empty string" do
      assert "UTF-8" = CharsetDetect.guess!("")
    end

    test "nil" do
      assert_raise ArgumentError, "argument error", fn ->
        CharsetDetect.guess!(nil)
      end
    end
  end
end