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.
NUnit is a unit testing framework for all .NET languages. This open source platform was initially ported from JUnit. However, the current version, NUnit 3.0, is completely rewritten and supports a wide range of .NET platforms.
Developers can write and execute automated tests for their code using the NUnit framework. NUnit is written in C# and can test code in any.NET language, including C#, VB.NET, and F#. The framework includes several assert methods for ensuring that the code under test is working properly. It also has a number of attributes that can be used to control test execution and set up and tear down the test environment. NUnit is a popular tool among developers to ensure that their code is high quality and free of defects.
In this tutorial, you will learn extensively about the NUnit testing framework, its environment setup, and how to run unit testing for your webpage with NUnit testing.
Before starting to write the test script for NUnit testing, you have to establish an environment, download some libraries, and need to install some packages which will help you write and execute the NUnit test. Major testers and developers use VS codes for writing codes and scripts, so first download Visual Studio and follow these steps for setting up the environment:
Deep dive into the blog on NUnit environmental setup to get step-by-step guidance about creating a setup for the NUnit framework for automation testing.
NUnit framework is more recommended than other testing frameworks because of its suitability with Selenium. In NUnit testing, you can run test scripts from the console runner with a third-party automation testing tool or with the NUnit Test Adaptor inside Visual Studio. Follow these steps to install and run your first automation test in the Selenium C# framework.
After building a setup for running the test, make sure that you download some Selenium webDriver files for the browsers on which you want to execute the test. Programming languages use particular interfaces to interact with browsers such an interface is called IwebDriver.
Here are some browsers and their download locations.
This setup is required for running tests in sequence on the NUnit framework. However, Selenium WebDriver is not enough to run tests parallelly. To run tests parallelly over different browsers, OS, and device combinations, Selenium Grid is a better option.
However, you need to download lots of browsers and OS for running tests parallelly on Selenium Grid which is not pocket friendly; for that, you will require a Cloud-based browser compatibility tools such as LambdaTest, where you can perform NUnit tests over 3000+ browsers and OS combinations.
We have a dedicated blog on how to run automation testing with the NUnit framework.
To interact with different web browsers, Selenium uses WebDriver commands. With the help of WebDriver commands, it automates certain browser actions such as opening, closing, maximizing windows, and many more.
Different languages, such as Python, C#, etc., have their own interface to interact with web browsers; the NUnit framework uses the IWebDriver interface for browser interaction.
Selenium WebDriver commands are browser commands to automate actions on browsers to perform tests. In NUnit testing, there are three different types of Selenium WebDriver commands.
Web Browser Commands: Those are used for managing different actions on browsers such as window open, close, minimize, etc.
Here are some important Web Browser Commands:
Web Element Commands: Those are used to manage different actions on web elements such as clicking on buttons, texting on Inbox, etc.
Here are some most useful Web Element Commands:
Drop Down Commands: These commands use for performing actions over drop-down elements on the window. Such as selecting deselecting on the drop-down menu.
Here are some most useful Drop Down Commands:
We have a dedicated blog on WebDrivers Commands for NUnit test automation for your better learning.
NUnit testing framework supports parameterized unit tests since the NUnit 2.5 version, and it is extremely useful when it is used with Selenium WebDriver. You can use certain attributes in your NUnit test and can make reliable test scripts to validate them over different browsers, versions, and OS, which can be passed as test parameters.Here are attributes in NUnit framework for parameterized NUnit test:
This attribute also supports many additional named parameters such as Author, Category, Description, ExpectedResult, TestName, etc.
Another major advantage of these attributes is that It is also possible to reuse the object or data that is a component of the function using the TestCaseSource attribute.
In our blog about parameterized unit tests in NUnit testing, you can learn more about it.
Assertions in NUnit testing are being used to check conditions that never occurred. For example, You can raise an assertion when the page title does not match the expected title.
Some more use cases of Assertions:
The NUnit testing framework has numerous asserts. Many testers use multiple assertions in a single test which is not good practice. Before NUnit 2.4 classic model gets used for NUnit asserts. NUnit 2.4 introduced constrain method that uses a single Assert Class method.
Here are five different categories of constraints in NUnit assert:
We have a dedicated blog where you can learn in detail about all those constraints and How to use assert in the NUnit framework.
A tag that offers details about a class or method is called an annotation. Annotations instruct the underlying framework on how to read the code. In NUnit, annotations are inserted between [ ].
Annotations are used by the NUnit framework because they enable the construction of a more reliable framework. Additionally, because the implementation is covered by different annotations, the test code is now more understandable.
The main purpose of NUnit annotations is to provide guidance to the underlying framework for reading the source code. A DLL (Dynamic Link Library) is created once the code has been compiled and can be run through a GUI or on the console.
Here are some Annotations used in NUnit tests:
In our blog dedicated to NUnit annotation, you can learn about annotations with examples.
Whether it be manual or automated testing, test reports are a crucial component of all testing-related activities. Test results are used to track how automation testing efforts have changed over time. The same logic is true when automated browser testing is done with MSTest, xUNit, or NUnit.
In Selenium C#, Extend and Allure have preferred NUnit reporting tools. Both third-party tools must be installed from the NuGet gallery using the Package Manager Console instructions or the Visual Studio UI. Extend in most popular reporting tool so we will take deep dive to understand about it.
ExtentReport is a well-known multilingual test reporting tool that provides comprehensive details about the test status. You may produce interactive and thorough test reports using the Extent framework. ExtentReport is also available for the Java language in addition to the .NET framework.
The Extent framework uses an Observer design, in which the reporter (for example, ExtentHTMLReporter) attached to the framework acts as an "observer" and receives notifications of changes such as the creation of logs, etc. Some of the changes that were informed led to content updates in the report. Although the Extent framework has many features, we would only need a few classes for NUnit report production.
When using the Extent framework to create NUnit reports, the following are the main classes that are usually used:
We have a devoted blog for generating test reports in the NUnit testing framework, where we have provided an A to Z description of report generation.
One of the primary objectives of any automation tester is to guarantee that the tests are done at the optimal rate. As tests can be performed concurrently against many "environments," Selenium's parallel execution is the place to start for accelerating test execution.
Parallel execution in NUnit testing is supported by SpecFlow. SpecFlow is the .NET-based framework for BDD (Behavior Driven Development) and acceptance-driven test development used by Selenium C# Automation testers.
There are a few options available in SpecFlow for Specflow Parallel Execution in Selenium. However, the amount of work required to parallelize with SpecFlow depends on how many external dependencies there are in the tests. Parallel test execution is only "possible" at the features (or class) level, not at the "scenario method" level, with Specflow NUnit.
Here are some important concepts you need to keep in mind while executing parallel tests in the NUnit framework:
ScenarioContext: It gets created for executing an individual scenario and gets disposed of once execution is finished.
FeatureContext: It gets created for executing the first scenario from features and gets disposed of once the execution of the scenario for the feature is done.
Because hooks are global, it is possible to define scope binding, filtered by tags, to limit their use to only certain circumstances or features. Unless expressly indicated, the execution order of Hooks for the same event is indeterminate.
Those were essential concepts regarding Parallel test execution with Selenium and NUnit testing framework. You can learn more with an example of Parallel execution with NUnit framework from our dedicated blog on it.
NUnit framework is a unit testing framework for .NET language programming such as C#. It is an open source program developed by the .NET foundation, which provides tools for writing and executing the unit test.
One way to designate a method inside a TestFixture class as a test is by using the Test property. If the first four letters are 'test', regardless of the case, a test method may also be found for backward compatibility with earlier versions of NUnit testing. You can enable this option by changing a variable in the test's configuration file.
NUnit is a unit testing framework that is compatible with Visual Studio and Selenium WebDriver. The most popular unit testing framework for .NET applications is NUnit. A tester can debug the automated tests using NUnit, which also shows the test results in an understandable style.
For batch test execution, NUnit provides a console runner (nunit3-console.exe). The NUnit Test Engine, via which the console runner operates, allows it to load, browse, and run tests.