Browser attribute for xUnit and WatiN. 
 
The aim is to make your cross browser tests more reusable by moving the logic of creating the browser object into an attribute. 
 
You can define multiple Browser attributes, each one which start an instance of the browser and execute the test. 
 
For example, the code below will start three different tests - one for each browser which can pass\fail indepently to provide you with accurate results.
 
    public class Example
    {
        [Theory]
        [Browser("IE")]
        [Browser("FireFox")]
        [Browser("Chrome")]
        public void Should_Click_Search_On_Google_And_Return_Results_For_AspNet(Browser browser)
        {
            browser.GoTo("http://www.google.co.uk");
            browser.TextField(Find.ByName("q")).Value = "asp.net";
            browser.Button(Find.ByName("btnG")).Click();
            Assert.True(browser.ContainsText("The Official Microsoft ASP.NET Site"));
        }
    }
 
NOTE: This will only work with the WatiN library.