How do I test multiple browsers with selenium and a single NUnit suite and keep it DRY?

Question

I\'m looking for a way to reuse one NUnit test suite without duplicating the entire suite for each browser. It seems like I would need a new fixture for each browser. Can I send

Answer 1

I recommend an important variation on Lucifer's solution. Have the attribute supply a factory, not a driver, to Fact/Theory methods. Why? Well, when you see all those browser windows pop-up (n x m, where n = number of tests, m = browsers per test), you'll decide you only want them created when the test is actually going to run.

So with updates from prior solution, including some name changes...

using OpenQA.Selenium;
using SeleniumPageObjectsPatternExample.Attributes;
using SeleniumPageObjectsPatternExample.PageObjects;
using Xunit;
using Xunit.Extensions;

namespace SeleniumHelpers
{    
    public class HomepageTests 
    {
        [Theory]
        [WebDriver(DriverType.Firefox)]
        [WebDriver(DriverType.GoogleChrome)]
        public void HomepageLinksToBlogPage(WebDriverFactory factory)
        {
            // arrange 
            IWebDriver webDriver = factory.Create(); // Browser starts here.
            var expected = "some expected value";

            // act
            var homepage = new HomePage(webDriver, true);

            // assert
            Assert.True(homepage.BlogLink.Displayed);
            Assert.Equal(expected, homepage.Header.Text);

            // Optional cleanup (better wrapped in try/finally for entire method).
            webDriver.Quit();
            webDriver.Dispose();
        }
    }
}

Updated DataAttribute... (Note, I corrected the signature of the GetData() method to work with the latest xUnit.)

using System.Reflection;
using OpenQA.Selenium;
using Xunit.Extensions;

namespace SeleniumHelpers
{    
    public class WebDriverAttribute : DataAttribute
    {
        private WebDriverFactory WebDriverFactory { get; set; }

        public WebDriverAttribute(Type browser)
        {
            this.WebDriver = WebDriverFactory.Create(browser);
        }

        public override IEnumerable GetData(MethodInfo methodUnderTest)
        {
            return new[] { new[] { this.WebDriverFactory } };
        }
    }
}

The new WebDriverFactory

using OpenQA.Selenium;
using OpenQA.Selenium.Chrome;
using OpenQA.Selenium.Firefox;

namespace SeleniumHelpers
{    
    public enum DriverType
    {
        Firefox,
        GoogleChrome
    }

    public class WebDriverFactory
    {
        private DriverType _driverType;
        public WebDriverFactory(DriverType driverType)
        {
            _driverType = driverType;
        }

        public static IWebDriver Create(Type browser)
        {
            IWebDriver webDriver;

            switch (browser)
            {
                case Type.Firefox:
                    webDriver = new FirefoxDriver();
                    break;
                case Type.GoogleChrome:
                    webDriver = new ChromeDriver();
                    break;
                default:
                    webDriver = new ChromeDriver();
                    break;
            }

            webDriver.Manage().Window.Maximize();

            return webDriver;
        }
    }
}