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Ergonomic Mocking for Elixir Unit Testing

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patch lib patch reflection.ex
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lib/patch/reflection.ex 

defmodule Patch.Reflection do

  @spec find_functions(module :: module()) :: Keyword.t(arity())

  def find_functions(module) do

    Code.ensure_loaded(module)



    cond do

      function_exported?(module, :__info__, 1) ->

        module.__info__(:functions)



      function_exported?(module, :module_info, 1) ->

        module.module_info(:exports)



      true ->

        []

    end

  end



  @spec find_arities(module :: module(), function :: function()) :: [arity()]

  def find_arities(module, function) do

    module

    |> find_functions()

    |> Keyword.get_values(function)

  end

end