Before NUnit 2.5 the previous answers were correct; you could only have a single [SetUp] attribute for a test.. With NUnit 2.5 onwards you can have multiple methods decorated with the [SetUp] attribute. The current version of NUnit is 3. If you want to learn unit testing in depth using mocking frameworks such as Moq, FakeItEasy and Typemock Isolator, I highly recommend checking out The Art of Unit Testing: with examples in C# by Roy Osherove. Before NUnit 2.5, you were permitted only one SetUp method. Setup and environment for NUnit. [SetUp] SetUp is generally used for initialization purposes. If you wanted to have some SetUp functionality in the base class and add more in the derived class you needed to call the base class method yourself. For download instructions, see Samples and Tutorials. In the above example, we have fixed the result to true that means we can only check the above test case with positive parameters. With NUnit 2.5, you can achieve the same result by defining a SetUp method in the base class and another in the derived class. NUnit also allows testers to use annotations such as SetUp, Test, and TearDown to perform actions before and after running the test. Test Runners are UI tool which actually run NUnit test cases and show the result of test cases whether they are passed or failed. Using NUnit, you can execute test cases from console runner by either a third-party automation testing tool or by the NUnit Test Adapter inside the Visual Studio. To run a test, select and click on Run. NUnit TestCase ExpectedResult. TL;DR. A file open dialog appears. About Moq; If the test passes, then the following test screen is displayed: Otherwise, the following screen displays: Important Attributes 1. If you prefer to follow the tutorial using a pre-built solution, view or download the sample code before you begin. The purpose of this blog post is to get you up and running writing your first unit tests with NUnit and Moq quickly. The following command is used to install NUnit using NuGet packages (Package Manager). It can be installed either from NuGet packages or from .NET Core CLI tool. NUnit TestFixture Inheritance A TestFixture attribute supports inheritance that means we can apply TestFixture attribute on base class and inherit from derived Test Classes. Now run the test. Once downloaded, install the NUnit GUI, and in the File menu, select the option of Open Project, then add DLL to the Calculator.Test project. For example in the above example, NUnit will create two separate test methods using each constructor parameters. Give the path of the NUunit test project DLL. Download TestRunners to check the test cases result: Passed or Failed. Now, in this Nunit testing tutorial, we will look into installation and set up required to run your first test automation script in Selenium C# framework. Therefore the below is perfectly valid in NUnit 2.5+: In the NUnit UI, you can clearly see the message for the failed test. As an alternate way, we can create class library project and add reference to NUnit. This tutorial takes you through an interactive experience building a sample solution step-by-step to learn unit testing concepts. In this example, we have use three TestCase attributes on same method with different parameters. In the NUnit API, click File > Open project. NUnit is very easy to use. After adding the DLL, you should able to see the tests loaded in the UI. Download package from Nuget or download directly from NUnit site. NUnit framework will create three different test cases using these three parameters. NUnit framework can be integrated with Selenium by creating a NUnit test class and running the test class using NUnit framework. It only provides some custom attributes and some static Assert classes. We'll learn about test runners in Environment Setup in next post. 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