Do not add testing environment variables in prod code.

src/syn_consistency.erl

@@ -139,13 +139,6 @@ handle_info({purge_double_processes, DoubleProcessesInfo}, #state{
     conflicting_process_callback_module = ConflictingProcessCallbackModule,
     conflicting_process_callback_function = ConflictingProcessCallbackFunction
 } = State) ->
-    %% is in a test environment, wait to ensure we can get the process exit callback messages
-    case application:get_env(is_test) of
-        undefined -> ok;
-        {ok, true} -> timer:sleep(2000);
-        _ -> ok
-    end,
-
     error_logger:warning_msg("About to purge double processes after netsplit"),
     purge_double_processes(ConflictingProcessCallbackModule, ConflictingProcessCallbackFunction, DoubleProcessesInfo),
     {noreply, State};