test: add another session duration test

We test that the session is cleared after it expires, but we don't
check that it's still there just before it expires, at least not in
the same way.

test/all-test.js

@@ -415,6 +415,43 @@ suite.addBatch({
   }
 });
 
+suite.addBatch({
+  "querying twice, each at 1/4 duration time": {
+    topic: function() {
+      var self = this;
+
+      var app = create_app_with_duration();
+      app.get("/bar", function(req, res) {
+        req.session.baz = Math.random();
+        res.send("bar");
+      });
+
+      app.get("/bar2", function(req, res) {
+        self.callback(null, req);
+        res.send("bar2");
+      });
+
+      var browser = tobi.createBrowser(app);
+      // first query resets the session to full duration
+      browser.get("/foo", function(res, $) {
+        setTimeout(function () {
+          // this query should NOT reset the session
+          browser.get("/bar", function(res, $) {
+            setTimeout(function () {
+              // so the session should still be valid
+              browser.get("/bar2", function(res, $) {
+              });
+            }, 200);
+          });
+        }, 200);
+      });
+    },
+    "session still has state": function(err, req) {
+      assert.isDefined(req.session.baz);
+    }
+  }
+});
+
 suite.addBatch({
   "querying twice, each at 3/4 duration time": {
     topic: function() {