Demo of how to use QUnit with NUnit

TestBase.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Web;
using NUnit.Framework;
using OpenQA.Selenium;
using OpenQA.Selenium.Chrome;
using OpenQA.Selenium.Firefox;
using OpenQA.Selenium.IE;
using OpenQA.Selenium.Support.UI;

namespace MyWebApp.Tests {
	public abstract class TestBase {
		public const string BaseAddress = "http://localhost:51379/";

		protected abstract string PageAddress { get; }

		protected void DoForAllBrowsers(Action<string, IWebDriver, WebDriverWait> action) {
			IWebDriver driver = null;
			try {
				driver = new ChromeDriver();
				var wait = new WebDriverWait(driver, TimeSpan.FromSeconds(30));
				action("Chrome", driver, wait);
			}
			finally {
				if (driver != null)
					driver.Quit();
				driver = null;
			}

			try {
				driver = new FirefoxDriver();
				var wait = new WebDriverWait(driver, TimeSpan.FromSeconds(30));
				action("Firefox", arg2: driver, arg3: wait);
			}
			finally {
				if (driver != null)
					driver.Quit();
				driver = null;
			}

			try {
				driver = new InternetExplorerDriver();
				var wait = new WebDriverWait(driver, TimeSpan.FromSeconds(30));
				action("IE", driver, wait);
			}
			finally {
				if (driver != null)
					driver.Quit();
				driver = null;
			}
		}

		[TestCaseSource("PerformTest")]
		public void Outcome(bool pass, string errorMessage) {
			if (!pass)
				Assert.Fail(errorMessage);
		}

		private string MakeFailureText(List<Tuple<string, string>> browserAndReasonCombinations) {
			if (browserAndReasonCombinations.All(c => c.Item2 == browserAndReasonCombinations[0].Item2))
				return "All Browsers: " + browserAndReasonCombinations[0].Item2;	// Same reason for failure in all browsers.

			var grouped = (  from c in browserAndReasonCombinations.Where(x => x.Item2 != null) group c by c.Item2 into g select new { Message = g.Key, Browsers = string.Join(", ", g.Select(x => x.Item1)) });
			return string.Join(Environment.NewLine, grouped.Select(g => g.Browsers + ": " + g.Message));
		}

		public IEnumerable<TestCaseData> PerformTest() {
			var result = Enumerable.Repeat(new { Index = 0, Text = "", Pass = false, Browser = "", ErrorMessage = "" }, 0).ToList();

			DoForAllBrowsers((browserName, driver, wait) => {
				driver.Url = BaseAddress + PageAddress;

				var all = driver.FindElements(By.CssSelector("ol#qunit-tests > li")).ToList();
				int index = 0;
				foreach (var elem in all) {
					bool pass = (" " + elem.GetAttribute("class") + " ").Contains(" pass ");
					var label = elem.FindElement(By.CssSelector(":first-child .test-name"));
					string errorMessage = null;
					if (!pass) {
						var failElem = elem.FindElements(By.CssSelector("ol > li.fail .test-message")).FirstOrDefault();
						errorMessage = (failElem != null ? failElem.Text : "Unknown error");
					}

					result.Add(new { Index = index, label.Text, Pass = pass, Browser = browserName, ErrorMessage = errorMessage });
					index++;
				}
			});

			var grouped = (  from r in result
			                group r by r.Index into g
			               select new { Text = g.First().Text, Pass = g.All(x => x.Pass), ErrorMessage = MakeFailureText(g.Select(x => Tuple.Create(x.Browser, x.ErrorMessage)).ToList()) }
			              ).ToList();

			return grouped.Select(item => new TestCaseData(item.Pass, item.ErrorMessage).SetName(item.Text));
		}
	}
}