diff --git a/packages/test-in-browser/driver.html b/packages/test-in-browser/driver.html
index 1877d24a1b..452d3bd539 100644
--- a/packages/test-in-browser/driver.html
+++ b/packages/test-in-browser/driver.html
@@ -35,6 +35,7 @@
       </div>
     </div>
   </div>
+  {{> groupNav}}
   <div class="row-fluid"><div class="span11 offset1">
   <ul class="failedTests">
     {{#each failedTests}}
@@ -51,15 +52,27 @@
 </template>
 
 <template name="progressBar">
-  <div id="testProgressBar" class="progress {{#if running}}progress-striped active{{/if}}">
+  <div id="testProgressBar" class="progress {{#if running}}progress-striped{{/if}}">
     <div class="bar bar-danger" style="width: {{percentFail}}%;"></div>
     <div class="bar {{#if anyFail}}bar-warning{{else}}bar-success{{/if}}" style="width: {{percentPass}}%;"></div>
   </div>
 </template>
 
+<template name="groupNav">
+  <div class="navbar navbar-fixed-bottom navbar-inverse">
+    <div class="navbar-inner">
+      <ul class="nav">
+      {{#each groupPaths}}
+        <li><a class="group" href="#">{{name}}</a></li>
+      {{/each}}
+      </ul>
+    </div>
+  </div>
+</template>
+
 <template name="test_group">
   <div class="group">
-    <div class="groupname">{{name}}</div>
+    <div class="groupname"><a>{{name}}</a></div>
     {{#each tests}}
       {{> test}}
     {{/each}}
diff --git a/packages/test-in-browser/driver.js b/packages/test-in-browser/driver.js
index e26ac68661..82aa3c6323 100644
--- a/packages/test-in-browser/driver.js
+++ b/packages/test-in-browser/driver.js
@@ -1,15 +1,42 @@
-var running = true;
+var running;
 
+var groupPathDeps;
+var groupPath;
+var resultTree;
+var failedTests;
+var resultDeps;
+var countDeps;
+var totalCount;
+var passedCount;
+var failedCount;
+var resetTests = function () {
+  if (!Session.get("groupPath"))
+    Session.set("groupPath", []);
+  resultTree =  [];
+  failedTests = [];
+  resultDeps = new Meteor.deps._ContextSet;
+  countDeps = new Meteor.deps._ContextSet;
+  totalCount = 0;
+  passedCount = 0;
+  failedCount = 0;
+
+  running = true;
+};
+resetTests();
 Meteor.startup(function () {
+  rerunTests();
+});
+
+var rerunTests = function () {
+  countDeps.invalidateAll();
+  _resultsChanged();
   Meteor._runTestsEverywhere(reportResults, function () {
     running = false;
     Meteor.onTestsComplete && Meteor.onTestsComplete();
     _resultsChanged();
     Meteor.flush();
-    // scroll to top so we can see global pass/fail
-    $("html, body").scrollTop(0);
-  });
-});
+  }, Session.get("groupPath"));
+};
 
 Template.progressBar.running = function () {
   countDeps.addCurrentContext();
@@ -20,14 +47,14 @@ Template.progressBar.percentPass = function () {
   countDeps.addCurrentContext();
   if (totalCount === 0)
     return 0;
-  return Math.floor(100*passedCount/totalCount);
+  return 100*passedCount/totalCount;
 };
 
 Template.progressBar.percentFail = function () {
   countDeps.addCurrentContext();
   if (totalCount === 0)
     return 0;
-  return Math.ceil(100*failedCount/totalCount);
+  return 100*failedCount/totalCount;
 };
 
 Template.progressBar.anyFail = function () {
@@ -35,6 +62,28 @@ Template.progressBar.anyFail = function () {
   return failedCount > 0;
 };
 
+Template.groupNav.groupPaths = function () {
+  var groupPath = Session.get("groupPath");
+  var ret = [];
+  for (var i = 1; i <= groupPath.length; i++) {
+    ret.push({path: groupPath.slice(0,i), name: groupPath[i-1]});
+  }
+  return ret;
+};
+
+Template.groupNav.events({
+  "click .group": function () {
+    console.log("clicked", this);
+    Session.set("groupPath", this.path);
+  }
+});
+
+Template.test_group.events({
+  "click .groupname": function () {
+    Session.set("groupPath", this.path);
+  }
+});
+
 Template.test_table.running = function() {
   resultDeps.addCurrentContext();
   return running;
@@ -227,14 +276,6 @@ Template.event.is_debuggable = function() {
 };
 
 
-var resultTree = [];
-var failedTests = [];
-var resultDeps = new Meteor.deps._ContextSet;
-var countDeps = new Meteor.deps._ContextSet;
-var totalCount = 0;
-var passedCount = 0;
-var failedCount = 0;
-
 var _resultsChanged = function() {
   resultDeps.invalidateAll();
 };
@@ -275,7 +316,6 @@ var _testStatus = function(t) {
 // possibly 'events'.
 var _findTestForResults = function (results) {
   var groupPath = results.groupPath; // array
-
   if ((! _.isArray(groupPath)) || (groupPath.length < 1)) {
     throw new Error("Test must be part of a group");
   }
@@ -286,7 +326,7 @@ var _findTestForResults = function (results) {
                  : resultTree);
     var newGroup = _.find(array, function(g) { return g.name === gname; });
     if (! newGroup) {
-      newGroup = {name: gname, parent: (group || null)}; // create group
+      newGroup = {name: gname, parent: (group || null), path: groupPath}; // create group
       array.push(newGroup);
     }
     group = newGroup;
diff --git a/packages/test-in-browser/package.js b/packages/test-in-browser/package.js
index eba86e93d2..0493ab73de 100644
--- a/packages/test-in-browser/package.js
+++ b/packages/test-in-browser/package.js
@@ -10,6 +10,8 @@ Package.on_use(function (api) {
   api.use('tinytest');
   api.use('bootstrap');
 
+  api.use('session');
+
   api.use(['spark', 'livedata', 'templating'], 'client');
 
   api.add_files([
diff --git a/packages/tinytest/tinytest.js b/packages/tinytest/tinytest.js
index f10fbc6fd7..f0a4081ab7 100644
--- a/packages/tinytest/tinytest.js
+++ b/packages/tinytest/tinytest.js
@@ -331,9 +331,9 @@ _.extend(TestManager.prototype, {
     self.ordered_tests.push(test);
   },
 
-  createRun: function (onReport) {
+  createRun: function (onReport, pathPrefix) {
     var self = this;
-    return new TestRun(self, onReport);
+    return new TestRun(self, onReport, pathPrefix);
   }
 });
 
@@ -344,46 +344,60 @@ TestManager = new TestManager;
 /* TestRun                                                                    */
 /******************************************************************************/
 
-TestRun = function (manager, onReport) {
+TestRun = function (manager, onReport, pathPrefix) {
   var self = this;
   self.manager = manager;
   self.onReport = onReport;
   self.next_sequence_number = 0;
-
+  self._pathPrefix = pathPrefix || [];
   _.each(self.manager.ordered_tests, function (test) {
-    self._report(test);
+    if (self._prefixMatch(test.groupPath))
+      self._report(test);
   });
 };
 
 _.extend(TestRun.prototype, {
+
+  _prefixMatch: function (testPath) {
+    var self = this;
+    for (var i = 0; i < self._pathPrefix.length; i++) {
+      if (!testPath[i] || self._pathPrefix[i] !== testPath[i]) {
+        return false;
+      }
+    }
+    return true;
+  },
+
   _runOne: function (test, onComplete, stop_at_offset) {
     var self = this;
-
     var startTime = (+new Date);
+    if (self._prefixMatch(test.groupPath)) {
+      test.run(function (event) {
+        /* onEvent */
+        self._report(test, event);
+      }, function () {
+        /* onComplete */
+        var totalTime = (+new Date) - startTime;
+        self._report(test, {type: "finish", timeMs: totalTime});
+        onComplete && onComplete();
+      }, function (exception) {
+        /* onException */
 
-    test.run(function (event) {
-      /* onEvent */
-      self._report(test, event);
-    }, function () {
-      /* onComplete */
-      var totalTime = (+new Date) - startTime;
-      self._report(test, {type: "finish", timeMs: totalTime});
+        // XXX you want the "name" and "message" fields on the
+        // exception, to start with..
+        self._report(test, {
+          type: "exception",
+          details: {
+            message: exception.message, // XXX empty???
+            stack: exception.stack // XXX portability
+          }
+        });
+
+        onComplete && onComplete();
+      }, stop_at_offset);
+    } else {
       onComplete && onComplete();
-    }, function (exception) {
-      /* onException */
-
-      // XXX you want the "name" and "message" fields on the
-      // exception, to start with..
-      self._report(test, {
-        type: "exception",
-        details: {
-          message: exception.message, // XXX empty???
-          stack: exception.stack // XXX portability
-        }
-      });
-
-      onComplete && onComplete();
-    }, stop_at_offset);
+    }
   },
 
   run: function (onComplete) {
@@ -467,8 +481,8 @@ globals.Tinytest = {
 // process only (if called on the server, runs the tests on the
 // server, and likewise for the client.) Report results via
 // onReport. Call onComplete when it's done.
-Meteor._runTests = function (onReport, onComplete) {
-  var testRun = TestManager.createRun(onReport);
+Meteor._runTests = function (onReport, onComplete, pathPrefix) {
+  var testRun = TestManager.createRun(onReport, pathPrefix);
   testRun.run(onComplete);
 };
 
diff --git a/packages/tinytest/tinytest_client.js b/packages/tinytest/tinytest_client.js
index cdb317c73b..b86cbbb83e 100644
--- a/packages/tinytest/tinytest_client.js
+++ b/packages/tinytest/tinytest_client.js
@@ -1,7 +1,7 @@
 // Like Meteor._runTests, but runs the tests on both the client and
 // the server. Sets a 'server' flag on test results that came from the
 // server.
-Meteor._runTestsEverywhere = function (onReport, onComplete) {
+Meteor._runTestsEverywhere = function (onReport, onComplete, pathPrefix) {
   var runId = Random.id();
   var localComplete = false;
   var remoteComplete = false;
@@ -17,7 +17,7 @@ Meteor._runTestsEverywhere = function (onReport, onComplete) {
   Meteor._runTests(onReport, function () {
     localComplete = true;
     maybeDone();
-  });
+  }, pathPrefix);
 
   Meteor.default_connection.registerStore(Meteor._ServerTestResultsCollection, {
     update: function (msg) {
@@ -34,12 +34,12 @@ Meteor._runTestsEverywhere = function (onReport, onComplete) {
         report.server = true;
         onReport(report);
       });
-    }  
+    }
   });
 
   var handle = Meteor.subscribe(Meteor._ServerTestResultsSubscription, runId);
 
-  Meteor.call('tinytest/run', runId, function (error, result) {
+  Meteor.call('tinytest/run', runId, pathPrefix, function (error, result) {
     if (error)
       // XXX better report error
       throw new Error("Test server returned an error");
diff --git a/packages/tinytest/tinytest_server.js b/packages/tinytest/tinytest_server.js
index 7350a2daa0..176ee07b60 100644
--- a/packages/tinytest/tinytest_server.js
+++ b/packages/tinytest/tinytest_server.js
@@ -22,7 +22,7 @@
   });
 
   Meteor.methods({
-    'tinytest/run': function (runId) {
+    'tinytest/run': function (runId, pathPrefix) {
       this.unblock();
 
       // XXX using private API === lame
@@ -52,7 +52,7 @@
         future.ret();
       };
 
-      Meteor._runTests(onReport, onComplete);
+      Meteor._runTests(onReport, onComplete, pathPrefix);
 
       future.wait();
     },