I'd like to load a browser page that is a static HTML test harness for a page running QUnit tests.
I'd like to get the values from the success/failure <span>
s and test with those.
How can I load a page and interrogate elements on it using MSTest/MSUnit?
If you don't mind starting actual browser, and you don't want to put dependency on SeleniumRC (which is required for C#), you can use WatiN. Below little example from WatiN.
Or if you don't want to start real browser on machine you can try Selenium, and HtmlUnit. With Selenium you start HtmlUnit, tell it to load given page, and you read what you need via xpath. For example this is example from Selenium documentation how to do something similar:
BTW with selenium you can use real browser also.
On the other hand if this page with results is local file, you just read the file and filter data you need.