Parallel Execution in Selenium with Visual Studio

Question

How to run test scripts in parallel for Selenium WebDriver with Visual Studio and C# ?

Answer 1

Disclaimer: the answer is assuming you're using the MsTest unit test framework.

Solution 1

The easiest way to run parallel tests is simply to activate this flag here:

An important note here: this only works for tests in different assemblies (projects). So tests in the same test project will still run sequentially. Of course, with large test suites for several modules, proper structuring of code should almost automatically result in several projects.

Solution 2

Another way to run in parallel is described here, in short: add the <parallelTestCount> node to the <Execution> node in your TestSettings.xml. This allows parallelism within an assembly. However, I have noticed that you'll probably need to deploy resource files using the DeploymentItem attribute.

Solution 3

Using SeleniumGrid as described here. I imagine this option is beyond the intent of your question?

Answer 2

Add attribute [Parallelizable] to your classes or methods which you wanna to execute parallel and try to tun. Be careful because if you add [Parallelizable] attribute to all test methods in the class with the attribute [TestFixture] - will use only 1 copy of driver in all tests. The sample below works for me fine.

[TestFixture]
public class AllTestByID
{
    IWebDriver _currentBrowser = new ChromeDriver(@"C:\Docs\QA\TestFrame\TestFrame\bin\Debug");

    [TestFixture]
    [Parallelizable]
    public class CheckSearch
    {
        AllTestByID newCopy = new AllTestByID();

        [Test]
        public void DownloadReport()
        {
            newCopy._currentBrowser.Navigate().GoToUrl("https://www.google.com/");
            newCopy._currentBrowser.FindElement(By.XPath("//input[@id='lst-ib']")).SendKeys("Find something");
        }
    }

    [TestFixture]
    [Parallelizable]
    public class CheckSearch2
    {
        AllTestByID newCopy = new AllTestByID();

        [Test]
        public void DownloadReport()
        {
            newCopy._currentBrowser.Navigate().GoToUrl("https://www.google.com/");
            newCopy._currentBrowser.FindElement(By.XPath("//input[@id='lst-ib']")).SendKeys("Find something");
        }
    }
}