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double_down

0.50.1
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Builds on the Mox pattern — generates behaviours and dispatch facades from `defcallback` declarations — and adds stateful test doubles powerful enough to test Ecto.Repo operations without a database.

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double_down lib double_down facade compile_helper.ex
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lib/double_down/facade/compile_helper.ex 

defmodule DoubleDown.Facade.CompileHelper do

  @moduledoc false



  # Helper for ensuring behaviour modules are compiled and their .beam

  # files are on disk before BehaviourFacade facades that depend on them.

  #

  # This is only needed when the behaviour and facade are compiled in the

  # same batch (e.g. both in test/support/). In normal usage the behaviour

  # would be in lib/ or a dependency, compiled in a prior batch.



  @doc false

  @spec ensure_compiled!(Path.t()) :: :ok

  def ensure_compiled!(source_path) do

    # Compile the file — returns [{module, binary}, ...]

    compiled = Code.compile_file(source_path)



    # Write each beam binary to the build output directory so

    # Code.Typespec.fetch_callbacks/1 can find them.

    for {module, binary} <- compiled do

      beam_path = beam_output_path(module)

      File.mkdir_p!(Path.dirname(beam_path))

      File.write!(beam_path, binary)

      # Load the binary so the code server also has it

      :code.load_binary(module, String.to_charlist(beam_path), binary)

    end



    :ok

  end



  defp beam_output_path(module) do

    # Use the first code path entry that looks like a build directory

    ebin_dir =

      :code.get_path()

      |> Enum.map(&to_string/1)

      |> Enum.find(&String.contains?(&1, "_build"))



    if ebin_dir do

      Path.join(ebin_dir, "#{module}.beam")

    else

      # Fallback: write to a temp directory and add it to the code path

      tmp = Path.join(System.tmp_dir!(), "double_down_beams")

      File.mkdir_p!(tmp)

      :code.add_patha(String.to_charlist(tmp))

      Path.join(tmp, "#{module}.beam")

    end

  end

end