如何编写Elixir doctest以验证空的MapSet

时间:2019-04-17 10:24:20

标签: elixir doctest ex-unit

仅了解Elixir中的doctest,我正在尝试编写Elixir doctest以验证结构将包含两个空的MapSet。

defstruct [:coordinates, :hit_coordinates]

@doc """
  Creates a new Island structure

  ## Examples

    iex> IslandsEngine.Island.new()
    %IslandsEngine.Island { coordinates: #MapSet<[]>, hit_coordinates: #MapSet<[]> }

"""
def new(), do:
  %Island{ coordinates: MapSet.new(), hit_coordinates: MapSet.new() }

使用mix test运行此命令时,出现以下错误:

Compiling 1 file (.ex)

  1) doctest IslandsEngine.Island.new/0 (1) (IslandsEngine.IslandTest)
     test/islands_engine/island_test.exs:3
     Doctest did not compile, got: (TokenMissingError) lib/islands_engine/island.ex:19: missing terminator: } (for "{" starting at line 19)
     code: %IslandsEngine.Island { coordinates: #MapSet<[]>, hit_coordinates: #MapSet<[]> }
     stacktrace:
       lib/islands_engine/island.ex:19: IslandsEngine.Island (module)

.......

Finished in 0.1 seconds
6 doctests, 2 tests, 1 failure

但是在IEx会话中一切运行正常:

iex> IslandsEngine.Island.new()
%IslandsEngine.Island{coordinates: #MapSet<[]>, hit_coordinates: #MapSet<[]>}
iex>

感谢您的帮助!

1 个答案:

答案 0 :(得分:1)

您需要使代码构造有效的答案,而不是doctest中的文本表示形式。所以代替:

%IslandsEngine.Island{coordinates: #MapSet<[]>, hit_coordinates: #MapSet<[]>}

要做:

%IslandsEngine.Island{coordinates: %MapSet{}, hit_coordinates: %MapSet{}}

我想在这种情况下,该示例作为测试几乎没有价值,因为它只是复制代码,但作为文档可能仍然有效。