Fix tests

lib/extension/networkMap.js

@@ -48,7 +48,8 @@ class NetworkMap extends Extension {
                 this.supportedFormats.hasOwnProperty(message)) {
                 const includeRoutes = topic === this.legacyTopicRoutes;
                 const topology = await this.networkScan(includeRoutes);
-                const converted = this.supportedFormats[message](topology);
+                let converted = this.supportedFormats[message](topology);
+                converted = message === 'raw' ? stringify(converted) : converted;
                 this.mqtt.publish(`bridge/networkmap/${message}`, converted, {});
             }
         }