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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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lib/double_down/contract/dispatch/keys.ex
defmodule DoubleDown.Contract.Dispatch.Keys do
@moduledoc """
Centralised NimbleOwnership key helpers for DoubleDown dispatch.
All test-time state is stored in a single `NimbleOwnership` GenServer
keyed by atoms derived from the contract module. This module provides
the canonical key-generation functions so that `Dispatch`, `Double`,
and `Testing` all agree on the key scheme.
## Key scheme
| Key | Function | Purpose |
|-----|----------|---------|
| `ownership_server/0` | Server name | The `NimbleOwnership` GenServer registered name |
| contract module atom | (no function) | Handler meta + inline state for stateful handlers |
| `log_key/1` | Per-contract | Accumulated `{contract, op, args, result}` call log |
| `contracts_key/0` | Global | Set of contracts with active `Double` expects |
"""
@doc """
The registered name of the NimbleOwnership GenServer.
"""
@spec ownership_server() :: atom()
def ownership_server, do: DoubleDown.Contract.Dispatch.Ownership
@doc """
NimbleOwnership key for a contract's dispatch call log.
"""
@spec log_key(module()) :: atom()
def log_key(contract), do: Module.concat(DoubleDown.Log, contract)
@doc """
NimbleOwnership key for the set of contracts with active `Double` expects/stubs.
"""
@spec contracts_key() :: atom()
def contracts_key, do: DoubleDown.Double.Contracts
end