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Batteries-included test isolation for Elixir and Phoenix.

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sandbox_case lib sandbox_case sandbox mimic.ex
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lib/sandbox_case/sandbox/mimic.ex 

defmodule SandboxCase.Sandbox.Mimic do

  @moduledoc false

  @behaviour SandboxCase.Sandbox.Adapter



  @cache_key {__MODULE__, :copied_modules}



  @impl true

  def available? do

    Code.ensure_loaded?(Mimic)

  end



  @impl true

  def setup(config) do

    mimic = Module.concat([Mimic])

    modules = config[:modules] || config



    for mod <- modules do

      mimic.copy(mod)

    end



    :persistent_term.put(@cache_key, modules)



    :ok

  end



  @impl true

  def checkout(_config), do: nil



  @impl true

  def checkin(_token), do: :ok



  @doc """

  Returns the list of modules registered at setup time. Used by the

  Propagator to avoid an expensive `:sys.get_state(Mimic.Server)` call

  on every HTTP request — under concurrent load Mimic.Server's mailbox

  can be contended enough that serializing its full state times out or

  stalls, causing silent Mimic-stub propagation failures.

  """

  def copied_modules do

    :persistent_term.get(@cache_key, [])

  end

end