Erlang macro to run some eunit test code inside its own process and wait for that process to complete before returning. This is useful when testing resources which get cleaned up when the current process completes like ets tables.

in_process_macro.erl

%%% MACRO

-define(in_process(TestCode),
    Self = self(),
    spawn_link(
        fun() ->
            TestCode,
            Self ! test_ok
        end),
    receive
        test_ok -> ok
    end
).

%%% USAGE

my_test() ->
    ?in_process(
        begin
            ?assertEqual(
                [3,2,1],
                lists:reverse([1,2,3])
            )
        end).