public void reset() {
        fileSystem.writeFileBlocking(file.getAbsolutePath(), Buffer.buffer(""));
        super.getMap().clear();
        apis.clear();
        clients.clear();
        clientMap.clear();
        apiMap.clear();
        root.clear();
        linkRoot();
        resetCompleteSignal();
    }
@author Marc Savy {@literal <marc@rhymewithgravy.com>}
gateway/test/src/test/java/io/apiman/gateway/test/junit/vertx3/ApiToFileRegistry.java