I\'m getting this error:
tests.IntegrationTests.Selenium.RegisterAndLogin (TestFixtureSetUp):
SetUp : OpenQA.Selenium.WebDriverException : Failed to start up
I also faced the problem while running the the test in NUnit. I found many solution to remove or degrade your Firefox.But i solved this in another way i remove all the references related to web drivers and add the upgrade web driver to the Solution.
In my application the webdriver version was 2.24 so i replaced with 2.43 and now my test are running fine.