Throwable failure = listener.getFailure();
        ExecutionCompleter completer = createCompleter();
        if (failure == null) {
            completer.complete();
        } else {
            completer.completeWithFailure(failure);
        }
    }

    @VisibleForTesting
    protected ExecutionCompleter createCompleter() {
        return new ProcessCompleter();
    }

    @VisibleForTesting

    final Action<ExecutionListener> action = Mock()
    final ProcessCompleter completer = Mock()
    final EntryPoint entryPoint = new EntryPoint() {
        @Override
        protected ExecutionCompleter createCompleter() {
            return completer
        }

        @Override
        protected void doAction(String[] args, ExecutionListener listener) {
            action.execute(listener)
        }
    }

    }
    boolean completedSuccessfully
    boolean completedWithFailure
    Throwable failure

    Main main

    def setup() {
        main = new Main() {
            protected ExecutionCompleter createCompleter() {
                [complete: { completedSuccessfully = true }, completeWithFailure: { completedWithFailure = true; failure = it }] as ExecutionCompleter
            }