when:
        def runningBuild = startBuild()

        then:
        conditions.eventually {
            waitingForChangesMessageAppears()
        }

        when:
        changeListeners.broadcastChange(FileWatcherRegistry.Type.MODIFIED, file.toPath())

        then:
        conditions.eventually {
            rebuiltBecauseOfChange()
        }

        cleanup:
        cancellationToken.cancel()

     */
    void addListener(FileChangeListener listener);

    void removeListener(FileChangeListener listener);

    void broadcastChange(FileWatcherRegistry.Type type, Path path);

    void broadcastWatchingError();

        broadcaster.add(listener);
    }

    @Override
    public void removeListener(FileChangeListener listener) {
        broadcaster.remove(listener);
    }

    @Override
    public void broadcastChange(FileWatcherRegistry.Type type, Path path) {
        broadcaster.getSource().handleChange(type, path);
    }

    @Override
    public void broadcastWatchingError() {

    private class BroadcastingChangeHandler implements FileWatcherRegistry.ChangeHandler {
        @Override
        public void handleChange(FileWatcherRegistry.Type type, Path path) {
            fileChangeListeners.broadcastChange(type, path);
        }

        @Override
        public void stopWatchingAfterError() {
            fileChangeListeners.broadcastWatchingError();
        }
    }