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NUnit with Selenium: Tutorial to run your first test on Lambdatest

In this topic, you will learn how to configure and run your C# automation testing scripts on LambdaTest Selenium Grid using C# framework NUnit.


By the end of this topic, you will be able to:

  1. Set up an environment for testing your hosted web pages using NUnit framework with Selenium.
  2. Understand and configure the core capabilities required for your Selenium test suite.
  3. Run test cases in parallel using NUnit with Selenium to reduce build times.
  4. Test your locally hosted pages on LambdaTest platform.
  5. Explore advanced features of LambdaTest.

Note: All the code samples in this documentation can be found in the LambdaTest's Repository on GitHub. You can either download or clone the repository to quickly run your tests.

Prerequisites For Running NUnit Selenium Tests

Note: This tutorial is specifically for Windows users using Microsoft Visual Studio.

Before you can start performing C# automation testing with Selenium, you would need to:

  • Download and install Selenium WebDriver from the official website.
  • Make sure you work with latest version of C#.
  • .Net framework to deliver guidelines while developing a range of application using C#.
  • Download Selenium WebDriver Language Binding for C# and extract them to appropriate folder. A .NET Core SDK of 2.1 or greater version.
  • You would also need LambdaTest tunnel binary file for testing your locally hosted or privately hosted projects.

Installing Selenium Dependencies and Tutorial Repo

Step 1: Clone the LambdaTest’s CSharp-NUnit-Selenium repository and navigate to the code directory as shown below:

git clone
cd CSharp-NUnit-Selenium

Setting up Your Authentication

Make sure you have your LambdaTest credentials with you to run test automation scripts with C# on LambdaTest Selenium Grid. You can obtain these credentials from the LambdaTest Automation Dashboard or through LambdaTest Profile.

Step 2: Set LambdaTest Username and Access Key in environment variables.


Run Your First Test

Sample Test Case

Step 3: Navigate to NUnitSeleniumTests.cs using VSCode. Here is a sample code base for a single C# automated test using NUnit Framework. Copy and replace this code in the NUnitSeleniumTests.cs file in the project you opened in the previous step.

using System;
using OpenQA.Selenium;
using OpenQA.Selenium.Remote;
using NUnit.Framework;
using System.Threading;
using System.Collections.Generic;

namespace NUnitSelenium

public class NUnitSeleniumSample1
public static string LT_USERNAME = Environment.GetEnvironmentVariable("LT_USERNAME") == null ? "YOUR LT_USERNAME" : Environment.GetEnvironmentVariable("LT_USERNAME");
public static string LT_ACCESS_KEY = Environment.GetEnvironmentVariable("LT_ACCESS_KEY") == null ? "YOUR LT ACCESS KEY" : Environment.GetEnvironmentVariable("LT_ACCESS_KEY");
public static bool tunnel = Boolean.Parse(Environment.GetEnvironmentVariable("LT_TUNNEL") == null ? "false" : Environment.GetEnvironmentVariable("LT_TUNNEL"));
public static string build = Environment.GetEnvironmentVariable("LT_BUILD") == null ? "YOUR BUILD NAME" : Environment.GetEnvironmentVariable("LT_BUILD");
public static string seleniumUri = "";

ThreadLocal<IWebDriver> driver = new ThreadLocal<IWebDriver>();
private String browser;
private String version;
private String os;

public void Init()

DesiredCapabilities capabilities = new DesiredCapabilities();
capabilities.SetCapability(CapabilityType.BrowserName, "Chrome");
capabilities.SetCapability(CapabilityType.Version, "96");
capabilities.SetCapability(CapabilityType.Platform, "Windows 10");

//Requires a named tunnel.
if (tunnel)
capabilities.SetCapability("tunnel", tunnel);
if (build != null)
capabilities.SetCapability("build", build);

capabilities.SetCapability("user", LT_USERNAME);
capabilities.SetCapability("accessKey", LT_ACCESS_KEY);

driver.Value = new RemoteWebDriver(new Uri(seleniumUri), capabilities, TimeSpan.FromSeconds(600));

public void Todotest()
Console.WriteLine("Navigating to todos app.");

Console.WriteLine("Clicking Checkbox");

// If both clicks worked, then te following List should have length 2
IList<IWebElement> elems = driver.Value.FindElements(By.ClassName("done-true"));
// so we'll assert that this is correct.
Assert.AreEqual(2, elems.Count);

Console.WriteLine("Entering Text");
driver.Value.FindElement(By.Id("sampletodotext")).SendKeys("Yey, Let's add it to list");

// lets also assert that the new todo we added is in the list
string spanText = driver.Value.FindElement(By.XPath("/html/body/div/div/div/ul/li[6]/span")).Text;
Assert.AreEqual("Yey, Let's add it to list", spanText);


public void Cleanup()
bool passed = TestContext.CurrentContext.Result.Outcome.Status == NUnit.Framework.Interfaces.TestStatus.Passed;
// Logs the result to LambdaTest
((IJavaScriptExecutor)driver.Value).ExecuteScript("lambda-status=" + (passed ? "passed" : "failed"));

// Terminates the remote webdriver session

Configuration of Your Test Capabilities

Step 4: In the test script, you need to update your test capabilities. In this code, we are passing browser, browser version, and operating system information, along with LambdaTest Selenium grid capabilities via capabilities object. The capabilities object in the above code are defined as:

DesiredCapabilities capabilities = new DesiredCapabilities();
capabilities.SetCapability(CapabilityType.BrowserName, "Chrome");
capabilities.SetCapability(CapabilityType.Version, "96");
capabilities.SetCapability(CapabilityType.Platform, "Windows 10");

Note: You can generate capabilities for your test requirements with the help of our inbuilt Capabilities Generator tool.

Executing the Test

Step 5: Build the solution by clicking on Build > Build Solution.

Step 6: As shown below click on Test Explorer on your MS Visual Studio:


Step 7: Click on Run from the Test Explorer to run the sample test as shown below:


Executing in Linux/macOS:

  • Install NuGet Packages for the project.
cd Packages
nuget.exe install ..\NUnitSelenium\packages.config
  • Clean and rebuild project.
nmake clean build

Your results would be displayed on the test console and on the LambdaTest dashboard. LambdaTest Dashboard will help you view all your text logs, screenshots and video recording for your entire Selenium tests.

Running Your Parallel Tests Using NUnit Testing Framework

Executing the Parallel Tests

  • Executing parallel tests in Windows:

    To run parallel tests, you may go to Test Explorer on Visual Studio as mentioned above and click on Run All tests to execute the tests.

  • Executing parallel tests in Linux/MacOS:

nmake test OR nmake all

Your results would be displayed on the test console and on the LambdaTest dashboard. LambdaTest Dashboard will help you view all your text logs, screenshots and video recording for your entire Selenium tests.

Testing Locally Hosted Projects Using NUnit Selenium

You can test your locally hosted or privately hosted projects with LambdaTest Selenium grid cloud using LambdaTest Tunnel app. All you would have to do is set up an SSH tunnel using LambdaTest Tunnel app and pass toggle tunnel = True via desired capabilities. LambdaTest Tunnel establishes a secure SSH protocol based tunnel that allows you in testing your locally hosted or privately hosted pages, even before they are made live.

Refer our LambdaTest Tunnel documentation for more information.

Here’s how you can establish LambdaTest Tunnel.

Download the binary file of:

Open command prompt and navigate to the binary folder.

Run the following command:

LT -user {user’s login email} -key {user’s access key}

So if your user name is and key is 123456, the command would be:

LT -user -key 123456

Once you are able to connect LambdaTest Tunnel successfully, you would just have to pass on tunnel capabilities in the code shown below :

Tunnel Capability

DesiredCapabilities capabilities = new DesiredCapabilities();
capabilities.SetCapability("tunnel", true);