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NUnit Tutorial

NUnit is a popular open-source unit testing framework for C#. It is ported from the JUnit framework. It is used for the development and execution of tests with the .NET language. It also facilitates batch execution of tests through console runner (nunit-console.exe). The console runner helps in loading, exploring, and executing tests with the help of NUnit Test Engine.

Why Is NUnit A Popular Test Automation Framework?

Here are some of the reasons why testers prefer NUnit framework over other C# test automation frameworks:

  • NUnit eases automation testing with C#, as it is compatible with popular test automation frameworks like Selenium.
  • NUnit Annotations helps in speeding up test development & execution, as tests can be executed with different input values.
  • TDD (Test Driven Development) is used for locating issues (or bugs) during the early stages of product development. NUnit test framework can be used with Selenium if you plan to use TDD (Test Driven Development) for the test activity.
  • NUnit supports parallel test execution.
  • Using NUnit, you can execute test cases from console runner through a third-party automation testing tool or NUnit Test Adapter inside Visual Studio.

Most of the .NET developers use Visual Studio for writing code as it eases the process of test case development, debugging, testing, and maintenance. NUnit Visual Studio Adapter is used to execute NUnit tests as it works with all the current editions of Visual Studio.

This is how to set up an NUnit Environment with Visual Studio.

Selenium is an open-source test automation framework used for automated cross browser testing. It supports popular web browsers – Firefox, Chrome, Microsoft Edge, Internet Explorer, Safari, etc. To interact with the underlying web browser, a collection of language specific bindings to drive the browser called Selenium WebDriver is used.

Check out our blog to run your first test automation script for Selenium C# framework.

Selenium Framework interacts with the web browser through Selenium WebDriver commands that let you automate actions like open, close, maximise the browser window, etc. Selenium Webdriver commands are the methods used to run your Selenium test automation scripts.

Deep dive into various Selenium WebDriver Commands for automating interactions with web browsers, DOM elements (or WebElements) and more.

NUnit has been supporting parameterized tests since the release of NUnit 2.5. Test methods can have parameters, and various attributes are available that indicate what arguments should be supplied by the NUnit framework. Using special attributes in NUnit, you can develop foolproof tests by verifying them on different browsers, browser versions, and platforms, which can be passed as parameters to the test.

Our detailed blog on NUnit Parameterized test examples can help in creating scalable tests for the purpose of cross browser testing.

When you are working on unit tests, there are scenarios where you wished that the execution should have stopped but ‘the Assertion,’ was missed. While developing tests using different test frameworks, my fellow developers frequently asked one question: ‘Should I use an assert or an exception in my test code’?

Let's answer this question with these in-depth insights about NUnit Asserts.

Annotations tell the underlying framework about how the code needs to be interpreted. Annotations in NUnit are added between [ ]. NUnit framework makes use of annotations since it helps in building a more robust framework. It also improves the clarity of the test code since the implementation is under different annotations.

Read all about NUnit Annotations and their execution sequence for Selenium.

Test reports are an integral part of any testing activity, whether it is automation testing or manual testing. They help track how the activities related to automation testing have evolved over a period of time. The same principle also applies when using NUnit framework for automated browser testing.

Take a look at NUnit Report Generation on how to integrate the NUnit reporting tool seamlessly with test implementation.

Automation tests can be executed at an optimal pace by leveraging parallel execution. This can be achieved if the implemented tests (or test suites) effectively utilize the capabilities offered by automation testing framework (like Selenium) and the testing infrastructure where the tests are run. Parallel execution in Selenium is the starting point for speeding up the test execution, as tests can be run simultaneously across different ‘environments.’

Parallel execution with NUnit can be achieved by using it with popular BDD (Behavior-Driven Development) frameworks like SpecFlow. This SpecFlow NUnit tutorial looks at how you can achieve NUnit Parallel Execution in SpecFlow.

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