diff --git a/cloudron.js b/cloudron.js
index f70c833..3d0cfa6 100644
--- a/cloudron.js
+++ b/cloudron.js
@@ -458,3 +458,4 @@ Cloudron.prototype.setDnsConfig = function (dnsConfig) {
     var res = request.post(this._origin + '/api/v1/settings/dns_config').query({ access_token: this._credentials.accessToken }).send(dnsConfig).end();
     common.verifyResponse2xx(res, 'Could not set dns config');
 };
+
diff --git a/test/app-flow-test.js b/test/app-flow-test.js
index 590db3c..1068b26 100644
--- a/test/app-flow-test.js
+++ b/test/app-flow-test.js
@@ -9,7 +9,7 @@ var AppStore = require('../appstore.js'),
     assert = require('assert'),
     Cloudron = require('../cloudron.js'),
     common = require('../common.js'),
-    request = require('superagent-sync');
+    net = require('net');
 
 require('colors');
 
@@ -56,7 +56,7 @@ describe('Application flow test', function () {
     var location = 'test' + (Math.random() * 10000).toFixed();
     it('can install app', function () {
         var manifest = appStore.getManifest(common.TESTAPP_ID, common.TESTAPP_VERSION);
-        appId = cloudron.installApp(location, manifest);
+        appId = cloudron.installApp(location, manifest, { ECHO_SERVER_PORT: 5151 );
     });
 
     it('can populate the addons', function () {
@@ -67,6 +67,22 @@ describe('Application flow test', function () {
         cloudron.checkAddons(cloudron.appFqdn(location), owner);
     });
 
+    it('can access exposed port', function (done) {
+        var client = new net.Socket();
+        var data = [ ];
+        client.connect(5151, cloudron.appFqdn(location), function() {
+            console.log('connected to 5151');
+        });
+        client.on('data', function (chunk) { data.push(chunk); });
+        client.on('close', function () {
+            var response = Buffer.concat(data).toString('utf8');
+            if (response === 'ECHO_SERVER_PORT=5151') return done();
+            console.log('unexpected response:', response);
+            done(new Error('bad response'));
+        });
+        client.on('error', done);
+    });
+
     it('displays app graphs', function () {
         cloudron.checkAppGraphs(appId);
     });