After navigating to URL, why don't the browsers let go?

[djangofan]

After navigating to URL, why don't the browsers let go? My tests start on Saucelabs (QUnit tests) and the browsers sit there doing nothing until the 3 minute (no activity) timeout is reached and then they finally give up. What am I doing wrong? I am expecting that immediately after the browser navigates to the initial URL, the test should end successfully right there BUT this is not what I see.

I configured my Gruntfile.js like this:

'saucelabs-qunit': {
            all: {
                options: {
                    username: uname,
                    key: ukey,
                    urls: ['http://the-internet.herokuapp.com', 'http://the-internet.herokuapp.com/context_menu'],
                    tunnelTimeout: 5,
                    tunneled: true,
                    build: 'grunt-qunit-1',
                    concurrency: 3,
                    browsers: browsers,
                    testname: 'nav to the-internet',
                    tags: ['master']
                }
            },

And the error I get looks like this, complaining about a 'length' parameter that I presume to be the 180 second timeout value?

>> Local Npm module "grunt-cli" not found. Is it installed?

Running "connect:server" (connect) task
Starting connect web server on localhost:9999.

Running "saucelabs-qunit:all" (saucelabs-qunit) task
=> Starting Tunnel to Sauce Labs
>> Connected to Saucelabs

 1 / 6 tests started

 2 / 6 tests started

 3 / 6 tests started

 4 / 6 tests started

 5 / 6 tests started

 6 / 6 tests started


Tested http://the-internet.herokuapp.com/context_menu
Platform: linux,chrome,latest
Passed: true
Url https://saucelabs.com/jobs/619553d-----------cb94f1052cf69bbc7


Tested http://the-internet.herokuapp.com
Platform: linux,chrome,latest
Passed: true
Url https://saucelabs.com/jobs/306a3f1341f-----------60ddba570dc4


Tested http://the-internet.herokuapp.com
Platform: WIN10,chrome,latest
Passed: true
Url https://saucelabs.com/jobs/8ef4fc368d-----------b22213f04ad8


Tested http://the-internet.herokuapp.com/context_menu
Platform: WIN10,firefox,latest
Passed: true
Url https://saucelabs.com/jobs/cece63c10914-----------08c015fb


Tested http://the-internet.herokuapp.com/context_menu
Platform: WIN10,chrome,latest
Passed: true
Url https://saucelabs.com/jobs/6957ffb353-----------d574fb0716


Tested http://the-internet.herokuapp.com
Platform: WIN10,firefox,latest
Passed: true
Url https://saucelabs.com/jobs/74e747613db-----------050d074fe3e
>> All tests completed with status true
=> Stopping Tunnel to Sauce Labs

Running "saucelabs-qunit:onTestComplete" (saucelabs-qunit) task
=> Starting Tunnel to Sauce Labs
>> Connected to Saucelabs
=> Stopping Tunnel to Sauce Labs
>> TypeError: Cannot read property 'length' of undefined
Warning: Task "saucelabs-qunit:onTestComplete" failed. Use --force to continue.

Aborted due to warnings.