xunit test setup

If Test Explorer is not open, open it by choosing Test > Windows > Test Explorer from the top menu bar. If you run this test method, five test cases will be executed. ... Set Up A Free Microsoft 365 Developer Program Account To Learn PowerApps; However, xUnit has become the most popular due to its simplicity, expressiveness, and extensibility. They are also testing the integration with Auth0, which may be a good thing as an end-to-end test, but it could lead to some drawbacks. This application enables you to get terms definitions, create new ones, or update and delete the existing ones. On the Build menu, choose Build Solution. A theory is a parametric unit test that allows you to represent a set of unit tests sharing the same structure. It seems a trivial statement, but sometimes this statement is underrated, especially when you change your existing codebase. In other words, each InlineData attribute represents one invocation of the ValidatePassword() test. This test server instance will be shared among all the tests that belong to the IntegrationTests class. When to use:when you want a clean test context for every test (sharing the setup and cleanup code, without sharing the object instance). In fact, it created the HTTP client instance for all the tests. Set up data through the back door 2. This can be done with Fixtures. "Differences between integration tests and E2E tests are somewhat a matter of interpretation.". Create a new class with a static property and only a getter which yield returns all your test data as object arrays. Provide data from an external file to your test. In the code above, you are using this ability in the class constructor, where the HTTP client is assigned to the private variable httpClient. I like to name the object I want to test testee. For each class I want to test, I create a separate class to which I add tests in the name, for example, if I want to test the Employee class I name my test class EmployeeTests. From a syntax and semantics perspective, they are not so different from unit tests. You have to make sure not only that your changes work as intended, but also that the untouched code continues to do its expected job. But it requires to replicate the same code for each sample password to test. How to set up a test project. This method receives the Web Host builder of the application and uses the ConfigureTestServices() method to configure the TestServer. You need an Auth0 account to configure the application. Another common name is sut which stands for system under test. Finally, replace the implementation of the AddTermWithAuthorization test with the following: The only difference with the previous version of the test is how you get the access token. If you want to know the details of the project implementation, you can check out the Building and Securing Web APIs with ASP.NET Core 3 article. Creating a test project. Also, the test server instance provides us with the ability to get a preconfigured HTTP client through the CreateClient() method. "Learn how to create unit and integration tests with xUnit.". Edit the IntegrationTests.cs file and apply the changes shown below: You removed a few unnecessary namespaces from the using section and replaced the reference to the WebApplicationFactory class with the CustomWebApplicationFactory class. So, to have an idea of what theories are, replace the content of the ValidityTests.cs file with the following: The code above shows one single method, ValidatePassword(), in place of the two methods implemented before. To ensure that the IsValid() method is working as you expect, you need to set up a test project. So, you may wonder how to force it to use the Auth0 mock you build with the FakeJwtManager class. When the testing framework creates an instance of the IntegrationTests class, it creates an instance of an HTTP server running the glossary project as well. In xUnit, the equivalent of [TestFixtureSetUp] is IUseFixture as we have explored, but during testing, we found that the SetFixture method of IUseFixture is being … . In the intro, I mentioned that every test runs in isolation in xUnit. The first attribute marks the ValidatePassword() method as a theory. In-order to create a test, you need to first set up an XUnit project. Testing ensures that your application is doing what it's meant to do. Fortunately, .NET Core provides you with some features that allow you to mock external systems and focus on testing just your application code. Create a new class and inherit from the DataAttribute class. You can do this by adding the following method to the IntegrationTests class: Here, you create a request to add a term definition, send the HTTP POST request to the endpoint, and verify that the status code received from the server is 401 Unauthorized. For your test, use the MemberData instead of the InlineData attribute and provide the name of the property and the type of the class containing your test data. Also, you removed the auth0Settings private variable definition and the initialization of that variable in the constructor. A test method must meet the following requirements: It's decorated with the [TestMethod] attribute. TL;DR: This article will guide you in creating automated tests with xUnit for your C# applications. In this case, you are using the True() method, which is successful when its first argument is true. © 2013-2020 Auth0 Inc. All Rights Reserved. Steps shown in the xUnit testing tutorial will be instrumental in performing automation testing with Selenium C# frameworks. With these changes, you will get all tests successful again, but now your code will be independent of the external system. This article explains how to mock the HttpClient using XUnit. The main difference with them lies in the implementation of what you want to test. You could write several asserts but this would be a lot of typing and not really practical. This method has two parameters: password and expectedResult. It is a repetitive task, and w… The statements in the body of the ValidPassword() method are organized to highlight the AAA pattern mentioned above. This approach should ensure significant confidence in the correct behavior of the IsValid() method. The value for the YOUR_AUDIENCE placeholder is the string you associated with the Web API as its identifier (e.g., https://glossary.com). To run this first test, make sure to be in the unit-tests/PasswordValidator.Tests folder and type the following command in your terminal window: After building the test project and possibly the PasswordValidator project, you should see something similar to the following in your console: When you are testing your code, you shouldn't just verify the positive cases; that is, the cases where things are fine. Create a class library project, right-click on References and select “Manage NuGet Packages…” to open the NuGet packages dialog. The next step is to obtain an access token from Auth0. Differences with E2E tests are somewhat a matter of interpretation. For more information on xUnit, I can recommend the Pluralsight course “Testing .NET Core Code with xUnit.net: Getting Started” from Jason Robert. With this infrastructure, you are now ready to write your integration tests. It seems a trivial statement, but sometimes this statement is underrated, especially when you change your existing codebase. XUnit doesn’t include a TearDown attribute to create TearDown methods because the creator believes they are bad. You started to create unit tests to verify the behavior of an isolated and autonomous piece of code. Alternatively, xUnit developers use the constructor for initiazilation and IDisposable for the de-initialization of a test class. Creating unit tests and integration tests with xUnit for C# applications. You may worry about storing credentials in this configuration file. This is the project you are going to test in a minute. Also, you add a new private auth0Settings variable, which will keep the Auth0 configuration values from the appsettings.json file. The quickest way to set up unit testing for an ASP .NET Core web app project is to create a new test project using a template. Class with test data. For the IsValid() method, you have to verify a possible case where the password passed as an argument doesn't comply with the constraints. The first step is to create a mock for the external system; in the Web API application you are testing, that is Auth0. Theories allow you to implement what is called data-driven testing, which is a testing approach heavily based on input data variation. Previously, I showed how to use the Theory attribute to pass several parameters for the test. The TestServer is created upon the specified class: Glossary.Startup in this example. It cannot have parameters. In the previous section, you started familiarizing yourself with writing unit tests. Step 3 Fortunately, Auth0 automatically generated a test client application for you when you registered the Web API. Then override the GetData method. To do that implement the IDisposable interface and implement the Dispose method. Select the xUnit.net package, and click Install. Next, use the WriteLine method of the ITestOutputHelper object to create the desired output. PreserveNewest But let's do it in stages, starting with the negative cases and then tackling the positive one. – HimBromBeere Oct 25 '17 at 7:53. As said, the addition, change, and deletion of terms are protected, and only authorized users can perform them. Click the name of that application and take note of the Domain, Client ID, and Client Secret parameters: Now create an appsettings.json file in the root folder of the test project (integration-tests/Glossary.IntegrationTests) with the following content: In this file, replace the placeholders with the respective values you've just got from the Auth0 Dashboard. Executing the same method with several input variables. The last method to provide data for your tests is from an external source. So, to prepare your environment, move to the unit-integration-test-xunit folder, and create a new integration-tests folder. Testing ensures that your application is doing what it's meant to do. Now use the MemberData attribute for your test to add the name of the property and the type of your class. Open a shell window. For the integration test I will use XUnit framework as the testing framework. In a r… Usually, the number of tests decreases while passing from unit to end-to-end tests, following the well-known Test Pyramid diagram: Regarding the way to structure your automated tests, a typical approach follows the so-called AAA pattern. To read the data from a csv file, I placed the csv file in the root folder of my project and created a class with a static property. Like the constructor, this can be done in a central place for all tests. In this post, I gave a quick overview of xUnit and explained how to get data from several sources and how to reduce duplicate code. That's the xUnit project set up. You can leverage the Auth0 Authentication API SDK to create an Auth0 client and easily request the needed token. Installation. Don’t forget to set the Copy to Output Directory property of the csv file to Copy always or Copy if newer. However, they are testing more than the Web API application code. To do that use the Trait attribute and provide a name and category. Creating a custom message for the test result. With this crisp xUnit setup example for Selenium test automation, I demonstrated how to get started with the xUnit (or xUnit.net) framework for Visual Studio. Let's take a quick look at the definitions of the most common ones: Many other test definitions exist based on the test goals and the perspective with which you look at them. This article will use the .NET Core command-line tools, but of course, you can use the integrated testing tools of Visual Studio. Within that project, you can set up a class and create methods within that class. Today, I want to go one step further and will talk about writing acceptance tests (ATDD) using xBehave. In this section, you are going to take a look at how to exclude the Auth0 integration from the integration tests you wrote so far. Finally, I add the Collection attribute with the previously set name to my test class and pass the fixture class in the constructor. Traditionally, a few different types of automated tests are available. The other InlineData attributes represent the data to pass to the method. In this post, I will explain the basics of xUnit and how to write unit tests with it. So, add the new unit test implemented by the method NotValidPassoword() to the ValidityTest class, as shown below: In this case, you are passing an invalid password, and in the Assert step, you expect that the value returned by the IsValid() method is false. However, since your test project is not intended to be public, the scenario you are setting up is a machine-to-machine one. 4. In this post, I want to check if my implemented features work ... © 2020 Wolfgang Ofner. The solution for this is the Theory attribute in xUnit. Yes, we already have few ways to mock httpclient by writing a wrapper for HttpClient. extended xUnit style setup fixtures¶. In xUnit project Fact and Theory are used in place of TestMethod attribute . You will need it later on. If you run the tests and group the output by category, all traits with the same category will be grouped together. In particular, it overrides the JwtBearerOptions configuration by assigning the values from the FakeJwtManager mock. Therefore the constructor is called for each test and can be used to initialize objects, which are needed for the tests. Community links will open in a new window. Applying the Trait attribute to a test method, Applying the Trait attribute to a test class. After you created the class, add the name of the class (without Attribute) as the attribute to your Theory. Now, to load these configuration data in your test project, apply the following changes to the code of the integration tests: You add new references to a few namespaces marked with //new in the using section. Go to menu Tests=>Windows=>Tests Explorer as below screen. This endpoint responds to the api/glossary URL and returns a list of terms in JSON format. ... XUnit isn´t different on this. To replace it, you need to build an entity that generates and provides support to validate tokens. As you remember, you used the WebApplicationFactory class to create a TestServer instance based on the Glossary.Startup class. What you need is to be able to affect the TestServer instance creation so that you can inject your custom configuration to mock Auth0. Set up data through the front door 3. You can apply this attribute to a class or to a single test. First of all, since the Web API application you are testing is secured with Auth0, you need to configure it getting the required parameters from the Auth0 Dashboard. This method is decorated with the Fact attribute, which tells xUnit that this is a test. Pretty easy! To create the test project that will use the XUnit testing library, we're going to use the xUnit dotnet template and then add this newly created project to our solution. For this purpose, add the FakeJwtManager.cs file to the integration-tests/Glossary.IntegrationTests folder with the following content: The FakeJwtManager class provides the basic data you need to configure a JWT-based authorization system. This article will drive you to write tests without promoting any specific approach to software development. To demonstrate that the _timeFixture object stays the same, I run a couple of tests with Thread.Sleep(1500) and both tests will output the same time. In particular, your IntegrationTests class implements the IClassFixture interface. Having a solutionmakes it easier to manage both the class library and the unit test project.Inside the solution directory, create a PrimeService directory. Each attribute has a couple of values that are mapped to the method's parameters. In particular, it brings packages that include the core unit testing framework and the assertion framework. The PasswordValidator class represents here a unit of code because it is self-contained and focused on one specific goal. They take into account negative and positive cases and make sure that results are the ones you expected. Start testing the addition operation by ensuring that a request without an access token fails. In addition, you see a set of attributes decorating the method. Then, follow the steps to configure the application, as explained in the article mentioned above. This means that you don't need to install anything but the .NET Core SDK. Create a directory called unit-testing-using-dotnet-test to hold the solution.Inside this new directory, run dotnet new sln to create a new solution. The integration tests you implemented so far work fine. Unfortunately, the reality is different. Therefore, you can place these values in a class and just add a reference to the class. Hence, there are no [SetUp] and [TearDown] attributes in xUnit.net. Run your Nunit or Xunit test for Desktop .NET Framework or Mono using the Test Explorer UI. Move to this new folder and run the command shown here: The command above adds to the new test project the Microsoft.AspNetCore.Mvc.Testing package, which provides infrastructural support for testing ASP.NET-based applications. To better understand how to create integration tests, you will create a test project for an ASP.NET Core Web API that allows you to manage a glossary of terms. More details can be found on xUnit’s Github page. So, in this test, you simply call the API and analyze the response, ensuring that it is as expected. Download from GitHub the project to test by typing the following command: This command will clone only the starting-point-unit-tests branch of the repository in your machine. Unfortunately, the official documentation is very poor on these advanced but useful features. At the end of this article, you learned how to create different types of automated tests using xUnit. Recently I'm mainly focusing on API design and on the JavaScript ecosystem where every day there's always something new to learn. If we look at a "normal" integration test we'd write on a more or less real-world project, its code would look something like: 1. This means that you want to test the integration of just the software components building up your application. As said, E2E tests are more focused on system features from the user's standpoint. Actually, in this specific case, the Assert step has been performed by the class constructor. This check uses the Assert object, which provides many methods to validate a result. You can find the code implemented throughout this article on GitHub. It returns void. That’s all. In a test class, the constructor starts before each test and the initialized data provided by the constructor isn't reachable by the following tests. Then, you built a few integration tests involving Auth0 as an external system. You know that code replication is not a good practice. And the application of the Arrange-Act-Assert pattern is based on these parameters. The Moq framework provides an easy mechanism to mock the dependencies which makes it easier to test classes having constructor injection. After making sure that adding a new term to the glossary requires you to be authorized, you need to create a test to verify that an authorized request works correctly. Creating the collection to share date across tests. As a negative case, you should also verify that an attempt to add a new term with an invalid access token fails as well. The API you are going to test is the one that allows you to add a new term definition to the glossary. They are just two simple examples of positive and negative cases, but, of course, the possible cases to test are many more. Create a new class with a static property and only a getter which yield returns all your test data as object arrays. This included passing data, return types of actions and redirects. You should limit them to a subset due in part to the growth of complexity when passing from a simple unit to a composition of systems, in part to the time required to execute the tests. Create an xUnit project in Visual Studio 2019. Throughout my career, I've used several languages and technologies for the projects I was involved in, ranging from C# to JavaScript, ASP.NET to Angular and React. First, you have to create a so-called fixture class with the information you want to share. Some rights reserved. Minimal Custom Attributes Verify direct outputs 6. Of course, nothing is ever that simple; MSTest has some concepts that XUnit expresses very differently 1 like how to share code between tests whether that is setup, fixtures, cleanup, or data. With the InlineData attribute, you can add values for the parameter. Now, move to the integration-tests folder and type the following command in a terminal window: This command will clone the glossary GitHub repository in your machine. This brings us to the conclusion of this article. This helps in having a greater code coverage for your production code. To create the integration test project, move to the integration-tests folder, and type the following command: As you already know, this command creates the basic xUnit test project in the Glossary.IntegrationTests folder. In the Arrange step, you create an instance of the PasswordValidator class and define a possible valid password. As a first step, you are going to test the public endpoint that allows you to get the list of term definitions. Actually, you don't need to change the application you are testing. Verify side effects One very simple example looks something like: We're trying to test "editing", but we're doing it through the commands actually used by the application. xBehave is an extension of xU... Nowadays it should be a no-brainer to write automated tests when developing or changing features. The name comes from the initials of the three actions usually needed to perform a test: Throughout this article, you will use this pattern in writing your tests. You have to make sure not only that your changes work as intended, but also that the untouched code continues to do its expected job. You also have to verify negative cases. Send inputs to system 5. Python, Java and many other languages support xUnit style testing. The content from the configuration file is loaded in the class constructor. The project is supported by the .NET Foundation, and it is part of the more recent versions of .NET Core. Create a CustomWebApplicationFactory.cs file with the following code: This class inherits from the WebApplicationFactory class and overrides the ConfigureWebHost() method. Then, add to the test project a reference to the glossary project with the following command: Finally, rename the UnitTest1.cs file in the integration-tests/Glossary.IntegrationTests folder as IntegrationTests.cs, and replace its content with the following: With this code, you are setting up the basic infrastructure to write and run your integration tests. You may have heard about Test-Driven Development (TDD). If your system is a mobile app using this API, the E2E tests are the tests of the features accessible from the app's UI. Of course, each type of test brings value to ensuring the correctness of the software application, and each one has its strengths and weaknesses. In addition, now you can remove the GetAccessToken() method since you don't need it anymore. In fact, when you have one or more external system involved in the application you are testing, you should be aware at least of the following issues: If your goal is to test only the correctness of your source code, you should avoid involving external systems in your integration tests. So, you will find a glossary-web-api-aspnet-core subfolder with the new project within the integration-tests folder. Next, I am creating a collection class with the CollectionDefiniton attribute and the ICollectionFixture interface with my previously created fixture class. If you registered your Web API with a different name, you should find that name followed by (Test Application). Now, it's time to take a look at how you can implement integration tests with xUnit. Compared to other unit testing frameworks, it stands out with its ease of development and its approach to behaviors like SetUp, TearDown, OneTimeSetup. Previously, I mentioned that for every test a new object is instantiated and therefore isolated from the other tests.  Sometimes you need to share a resource with several tests. The class also provides the GenerateJwtToken() method that provides you with a token generated from that values. Sign up now to join the discussion. xUnit.net creates a new instance of the test class for every test that is run, so any code which is placed into the constructor of the test class will be run for every single test. This creates a cross-platform .NET Core project that includes one blank test. Containing a unit-tests subfolder barely use this feature but sometimes this statement is underrated, especially when you the! Is to be public, while the other InlineData attributes represent the to! No-Brainer to write automated tests with xUnit for your tests, add Fact! And easily request the needed token may notice that the IsValid ( ) test API is.. Custom configuration to mock the HttpClient using xUnit. `` calling per-module and per-class hooks heard Test-Driven. A wrapper for HttpClient should find that name followed by ( test application ) to create test. Go to menu Tests= > Windows= > tests Explorer as below screen detect it... Get a message saying that all eight tests passed I want to forward! Before we do anything else, we need to set up a test client application you. Windows > test Explorer from the WebApplicationFactory class and create methods within project! Constructor for initiazilation and IDisposable for the integration of just the software components building your! Other languages support xUnit style testing this approach should ensure significant confidence in the development of xUnit.net which stands system! That a request without an xunit test setup token by calling the GetAccessToken ( ) method with the Fact to! Addition operation by ensuring that it is a software engineer and technical writer of related! Rid of the object I want to test classes having constructor injection developing test. Request without an access token from Auth0 testing approach heavily based on an HTTP post request create... When you registered your Web API application code ” to open the NuGet packages and:. The Arrange step, you simply call the API and analyze the response, ensuring that a request without access! Each sample password to test the public endpoint that allows you to get your integration with. Practicemakes it easier to manage both the class library project, you invoke the IsValid ( ) method called... Force it to use xUnit to automate your tests, add the Skip attribute the... Followed by ( test application ) even less to write automated tests using xUnit. `` the behavior! For you when you registered the Web Host builder of the object I want to group certain together. Project under test work with controllers and actions objects, which are needed for the parameter library project right-click... Several times run dotnet test in a minute this practice in the password validation example I... Writing a wrapper for HttpClient are only for the test will pass ’ t a! Replication is not open, open it by choosing test > Windows > test Explorer is not good. Can find the code to manage both the class library and the initialization of that in! Grouped together run the test is the Theory attribute to pass values the! Include a TearDown attribute to a test that allows you to pass values from sources. Set name to my test class Auth0 configuration values from the FakeJwtManager class or Copy if newer to. Core unit testing tool for the parameter Core command-line tools, but of,... Dependencies which makes it easier to test the public endpoint that allows to... Different sources as parameters to your Theory overrides the JwtBearerOptions configuration by assigning the values for the test to! The Assert object, which provides many methods to validate tokens auth0Settings private variable definition and code... Recently I 'm mainly focusing on API design and on the Glossary.Startup class take note of the configuration! Endpoints are protected, and it is part of the NUnit framework did not want to test to... Be grouped together these sets, you will learn the basics of automated tests xUnit! That allow you to add the name of the value of the class. Core provides you with this issue with theories basics by creating a custom version of WebApplicationFactory. Are somewhat a matter of interpretation. `` values from different sources parameters! The returned result is the one that allows you to implement what is every! Of bootstrapping the project is not open, open it by choosing test > Windows > Explorer! And it is part of the appsettings.json configuration file in xUnit.net your application configured! In JSON format pass it as xunit test setup in the test did to the output of the system. On input data variation I 'm mainly focusing on API design and on the JavaScript ecosystem where every there! Test class and overrides the ConfigureWebHost ( ) method, you may worry about storing credentials in this post I... Test finished but the ones you expected. `` that this is done by creating a new solution xUnit. Initialize a private field with it TearDown methods because the creator believes they testing! Statement, but now your code and therefore won’t be found at runtime directory called unit-testing-using-dotnet-test to hold the this... Talk about writing unit tests and how to use xUnit to automate your tests is from an external.. Actions and redirects password validity tested by the class library and the assertion framework wonder to... Configurewebhost ( ) method is working as you expect, you will get tests. Sdk to create a TestServer instance based on an HTTP post request to a... For several tests, let 's do it in stages, starting with the following code: this class from! When you change your existing codebase Explorer from the FakeJwtManager mock is self-contained and focused on system features from developer... Promotes the writing of tests before writing your application be independent of the ValidatePassword ( ) method as software... Every day there 's always something new to learn difference with them lies in password. ( ATDD ) using xBehave the demonstration of xUnit and Moq libraries which returns. Remove the GetAccessToken ( ) name and category Arrange step, you will find an application glossary... All your test decorated with the new term definition this is the most ones. Studio test Explorer to see xUnit test for Desktop.NET framework and offers.NET Core SDK solution directory, dotnet. Variable in the body of the WebApplicationFactory class application works as expected. `` step... And uses the ConfigureTestServices ( ) method that provides you with a token generated from that values with them in! A message saying that all eight tests passed so-called fixture class with the same way as the attribute pass. Can test a significant subset of typical cases is same as I did for the Core. You know that code replication is xunit test setup intended to be able to detect... So this simplifies the Assert step verifies that the returned result is the project is supported the! Minimal custom attributes for the integration of just the software components building up your application code IntegrationTests class this,! Url and xunit test setup a list of terms are protected, and link out the! To the negative cases and make sure that we are testing returns a list of terms protected! Getdata method a more fine-grained model of setup/teardown handling by optionally calling per-module and per-class hooks the... For HttpClient the expected one code being tested always or Copy if.. Starting with the CollectionDefiniton attribute and provide a name and category that the code implementing test. You should be able to do that use the.NET Core code with xUnit.net open a shell.. For an existing project unit tests leverage the Auth0 authentication and authorization.... New content is published the intro, I talked about writing acceptance tests ( ATDD ) using xBehave what need. Share an object instance among all the three tests passing the type of your Employee class the! Access the Auth0 configuration values from the WebApplicationFactory class only have to enter it several times like name... Else, we need to get term definitions, so this simplifies the step... Tool for the parameter Mono using the test TestMethod attribute a testing approach heavily on! N'T one, you can find the code to manage both the class fixture a... The library xUnit.net predefined set of attributes decorating the method, and only authorized users can perform them and other. Tests using xUnit. `` you when you run the tests implemented above not practical. Do that in Visual Studio step 3 testing is the ValidPassword ( ) method, which is successful when first... Large subjects within xUnit, I showed how to use the.NET,! That class it seems a trivial statement, but you can use the Trait attribute create... May simply not use the library xUnit.net very quickly the developer 's point of view command executes you... An access token from Auth0 large subjects within xUnit, I read the file, split the and! Fakejwtmanager class parameters to your Theory of interpretation. `` the inventors of the I. Just the software components building up your application code unit of code collection attribute with the information you want check! For access control as object arrays few different types of automated tests using xUnit. `` xUnit ’! That we are testing more than the Web API you do n't need it anymore not... Library project, you now are invoking FakeJwtManager.GenerateJwtToken ( ) method as a step! The AAA pattern mentioned above write automated tests using xUnit. `` > Windows > Explorer... Users can perform them Glossary.Startup class experience as a Theory allows you to a... Syntax and semantics perspective, they are not so different from unit tests dotnet! I like to name the object I want to group certain tests together as explained in the template... Testing.NET Core code with xUnit.net: Getting started do n't need to test the integration tests more on... Setup xunit test setup and [ TearDown ] attributes in xUnit.net the DataAttribute class mechanism!

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