diff --git a/web/gui/src/test/_karma/mockserver.js b/web/gui/src/test/_karma/mockserver.js
new file mode 100644
index 0000000..319c4c8
--- /dev/null
+++ b/web/gui/src/test/_karma/mockserver.js
@@ -0,0 +1,248 @@
+#!/usr/bin/env node
+
+// === Mock Web Socket Server - for testing the topology view
+
+var fs = require('fs'),
+    readline = require('readline'),
+    http = require('http'),
+    WebSocketServer = require('websocket').server,
+    port = 8123;
+
+var lastcmd,        // last command executed
+    lastargs,       // arguments to last command
+    connection,     // ws connection
+    origin,         // origin of connection
+    scid,           // scenario ID
+    scdata,         // scenario data
+    scdone,         // shows when scenario is over
+    evno,           // next event number
+    evdata;         // event data
+
+
+
+var rl = readline.createInterface(process.stdin, process.stdout);
+rl.setPrompt('ws> ');
+
+
+var server = http.createServer(function(request, response) {
+    console.log((new Date()) + ' Received request for ' + request.url);
+    response.writeHead(404);
+    response.end();
+});
+
+server.listen(port, function() {
+    console.log((new Date()) + ' Server is listening on port ' + port);
+});
+
+server.on('listening', function () {
+    console.log('OK, server is running');
+    console.log('(? for help)');
+});
+
+var wsServer = new WebSocketServer({
+    httpServer: server,
+    // You should not use autoAcceptConnections for production
+    // applications, as it defeats all standard cross-origin protection
+    // facilities built into the protocol and the browser.  You should
+    // *always* verify the connection's origin and decide whether or not
+    // to accept it.
+    autoAcceptConnections: false
+});
+
+function originIsAllowed(origin) {
+    // put logic here to detect whether the specified origin is allowed.
+    return true;
+}
+
+wsServer.on('request', function(request) {
+    console.log(); // newline after prompt
+    console.log("Origin: ", request.origin);
+
+    if (!originIsAllowed(request.origin)) {
+        // Make sure we only accept requests from an allowed origin
+        request.reject();
+        console.log((new Date()) + ' Connection from origin ' + request.origin + ' rejected.');
+        return;
+    }
+
+    origin = request.origin;
+    connection = request.accept(null, origin);
+
+
+    console.log((new Date()) + ' Connection accepted.');
+    rl.prompt();
+
+    connection.on('message', function(message) {
+        if (message.type === 'utf8') {
+            console.log(); // newline after prompt
+            console.log('Received Message: ' + message.utf8Data);
+            //connection.sendUTF(message.utf8Data);
+            rl.prompt();
+        }
+        else if (message.type === 'binary') {
+            console.log('Received Binary Message of ' + message.binaryData.length + ' bytes');
+            //connection.sendBytes(message.binaryData);
+        }
+    });
+    connection.on('close', function(reasonCode, description) {
+        console.log((new Date()) + ' Peer ' + connection.remoteAddress + ' disconnected.');
+        connection = null;
+        origin = null;
+    });
+});
+
+
+setTimeout(doCli, 10); // allow async processes to write to stdout first
+
+function doCli() {
+    rl.prompt();
+    rl.on('line', function (line) {
+        var words = line.trim().split(' '),
+            cmd = words.shift(),
+            str = words.join(' ');
+
+        if (!cmd) {
+            // repeat last command
+            cmd = lastcmd;
+            str = lastargs;
+        }
+
+        switch(cmd) {
+            case 'c': connStatus(); break;
+            case 'm': customMessage(str); break;
+            case 's': setScenario(str); break;
+            case 'n': nextEvent(); break;
+            case 'r': restartScenario(); break;
+            case 'q': quit(); break;
+            case '?': showHelp(); break;
+            default: console.log('Say what?!  (? for help)'); break;
+        }
+        lastcmd = cmd;
+        lastargs = str;
+        rl.prompt();
+
+    }).on('close', function () {
+        quit();
+    });
+}
+
+var helptext = '\n' +
+        'c        - show connection status\n' +
+        'm {text} - send custom message to client\n' +
+        's {id}   - load scenario {id}\n' +
+        's        - show scenario staus\n' +
+        //'a        - auto-send events\n' +
+        'n        - send next event\n' +
+        'r        - restart the scenario\n' +
+        'q        - exit the server\n' +
+        '?        - display this help text\n';
+
+function showHelp() {
+    console.log(helptext);
+}
+
+function connStatus() {
+    if (connection) {
+        console.log('Connection from ' + origin + ' established.');
+    } else {
+        console.log('No connection.');
+    }
+}
+
+function quit() {
+    console.log('Quitting...');
+    process.exit(0);
+}
+
+function customMessage(m) {
+    if (connection) {
+        console.log('Sending message: ' + m);
+        connection.sendUTF(m);
+    } else {
+        console.warn('No current connection.');
+    }
+}
+
+function showScenarioStatus() {
+    var msg;
+    if (!scid) {
+        console.log('No scenario loaded.');
+    } else {
+        msg = 'Scenario: "' + scid + '", ' +
+                (scdone ? 'DONE' : 'next event: ' + evno);
+        console.log(msg);
+    }
+}
+
+function scenarioPath(evno) {
+    var file = evno ? ('/ev_' + evno + '_onos.json') : '/scenario.json';
+    return 'ev/' + scid + file;
+}
+
+
+function initScenario(verb) {
+    console.log(); // get past prompt
+    console.log(verb + ' scenario "' + scid + '"');
+    console.log(scdata.title);
+    scdata.description.forEach(function (d) {
+        console.log('  ' + d);
+    });
+    evno = 1;
+    scdone = false;
+}
+
+function setScenario(id) {
+    if (!id) {
+        return showScenarioStatus();
+    }
+
+    evdata = null;
+    scid = id;
+    fs.readFile(scenarioPath(), 'utf8', function (err, data) {
+        if (err) {
+            console.warn('No scenario named "' + id + '"', err);
+            scid = null;
+        } else {
+            scdata = JSON.parse(data);
+            initScenario('Loading');
+        }
+        rl.prompt();
+    });
+}
+
+function restartScenario() {
+    if (!scid) {
+        console.log('No scenario loaded.');
+    } else {
+        initScenario('Restarting');
+    }
+    rl.prompt();
+}
+
+function nextEvent() {
+    var path;
+
+    if (!scid) {
+        console.log('No scenario loaded.');
+        rl.prompt();
+    } else if (!connection) {
+        console.warn('No current connection.');
+        rl.prompt();
+    } else {
+        path = scenarioPath(evno);
+        fs.readFile(path, 'utf8', function (err, data) {
+            if (err) {
+                console.log('No event #' + evno);
+                scdone = true;
+                console.log('Scenario DONE');
+            } else {
+                evdata = JSON.parse(data);
+                console.log(); // get past prompt
+                console.log('Sending event #' + evno + ' [' + evdata.event + ']');
+                connection.sendUTF(data);
+                evno++;
+            }
+            rl.prompt();
+        });
+    }
+}