Here's a simple diff that gets two people logged in at the same time. CC @Standard8

gistfile1.diff

diff --git a/test/functional/app_test.js b/test/functional/app_test.js
index 1e40641..57e4360 100644
--- a/test/functional/app_test.js
+++ b/test/functional/app_test.js
@@ -12,6 +12,7 @@ var webdriver = require('selenium-webdriver'),
     By = webdriver.By;
 
 var driver;
+var driver2;
 
 describe("browser tests", function() {
   this.timeout(60000);
@@ -22,12 +23,19 @@ describe("browser tests", function() {
         usingServer('http://localhost:4444/wd/hub').
         withCapabilities({'browserName': 'firefox'}).
         build();
+
+      driver2 = new webdriver.Builder().
+        usingServer('http://localhost:4444/wd/hub').
+        withCapabilities({'browserName': 'firefox'}).
+        build();
       done();
     });
   });
 
   after(function(done) {
+    driver2.quit()
     driver.quit();
+;
     app.shutdown(done);
   });
 
@@ -49,7 +57,15 @@ describe("browser tests", function() {
     driver.findElement(By.css("div.alert-info")).getText()
           .then(function(alert) {
       expect(alert).to.contain('only person');
-      done();
+
+      driver2.get(serverHttpBase);
+      driver2.findElement(By.name("nick")).sendKeys("larry");
+      driver2.findElement(By.id("submit")).click();
+      driver2.findElement(By.css("strong.nick")).getText().then(function(nick) {
+        expect(nick).to.equal('larry');
+
+        done();
+      });
     });
   });