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double_down

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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 contract dispatch defer.ex
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lib/double_down/contract/dispatch/defer.ex 

defmodule DoubleDown.Contract.Dispatch.Defer do

  @moduledoc """

  A deferred execution marker.



  When a handler or test double returns `%DoubleDown.Contract.Dispatch.Defer{fun: fun}`,

  the dispatch system releases the NimbleOwnership lock before calling

  `fun.()`. This avoids deadlocks when the deferred function makes

  further dispatched calls (e.g. `transact` calling `insert` inside

  its body).



  **For users of the Double API**, prefer `DoubleDown.Double.defer/1`

  over constructing this struct directly.



  Used internally by `Repo.Stub`, `Repo.OpenInMemory`, and

  `DoubleDown.Double`'s canonical handler.

  """



  @enforce_keys [:fun]

  defstruct [:fun]



  @type t :: %__MODULE__{fun: (-> term())}



  @doc "Create a new Defer marker. Validates that `fun` is a 0-arity function."

  @spec new((-> term())) :: t()

  def new(fun) when is_function(fun, 0), do: %__MODULE__{fun: fun}

end