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Clarify Mox.allow/3 usage with deferred functions #166

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Aug 27, 2025
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Clarify Mox.allow/3 usage with deferred functions #166

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7 changes: 7 additions & 0 deletions lib/mox.ex
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Expand Up @@ -760,6 +760,13 @@ defmodule Mox do

allow(MyMock, self(), fn -> GenServer.whereis(Deferred) end)

This means that if the process isn’t started yet, you can pass a function
that resolves to the pid later. When the mock is invoked,
Mox will call this function. If it returns a pid, the call is allowed.
If it doesn’t, the expectation fails.

This is especially useful when testing a `GenServer` that calls the mock during `init/1`,
since the server’s pid is not available until after `start_link/1`.
"""
@spec allow(mock, pid(), term()) :: mock when mock: t()
def allow(mock, owner_pid, allowed_via) when is_atom(mock) and is_pid(owner_pid) do
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