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Ergonomic Mocking for Elixir Unit Testing

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patch lib patch mock values callable.ex
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lib/patch/mock/values/callable.ex 

defmodule Patch.Mock.Values.Callable do

  @type dispatch_mode :: :apply | :list



  @type t :: %__MODULE__{

          dispatch: dispatch_mode(),

          target: function()

        }

  defstruct [:dispatch, :target]



  @spec advance(callable :: t()) :: t()

  def advance(callable) do

    callable

  end



  @spec new(target :: function(), dispatch :: dispatch_mode()) :: t()

  def new(target, dispatch \\ :apply) do

    %__MODULE__{dispatch: dispatch, target: target}

  end



  @spec next(callable :: t(), arguments :: [term()]) :: {t(), term()}

  def next(%__MODULE__{dispatch: :apply} = callable, arguments) do

    {callable, apply(callable.target, arguments)}

  end



  def next(%__MODULE__{dispatch: :list} = callable, arguments) do

    {callable, apply(callable.target, [arguments])}

  end

end