This article will lay out a relatively simple way to do this in a configurable manner using xUnit. I am used to using xUnit as testing tool, so this article uses xUnit. If you run the tests, all should be good. Verify direct outputs 6. This post is part of an ongoing series where we build a “walking skeleton” application using ASP.NET Core and Angular as well as other technologies for deployment and testing. And, I can’t be sure from testing what an error from the third-party server looks like, based on convention we’ll guess that it’s a 500 HTTP status with “Internal Error.” as the message. Lines 16-19 carry our checks. In the next post, we’ll then use those tests to scaffold some exception handling that’s missing from our classes right now. This one is going to be more involved. If we make a change to the OpenWeatherService that could break the WeatherForecastController, we wouldn't know it if we were mocking the service in these tests. The dotnet CLI contains a template for adding a xUnit test project, as well as templates for the nUnit and MSTest libraries. Use ASP.NET Core's TestServer in xUnit to Test Web API Endpoints: TestServer - Part 1 20th November 2020 Using ASP.NET Core's TestServer allows us to create an in-memory web server. The strategy I’ve decided on is to test how the OpenWeatherService responds to different possible responses from the third-party API. Handle the “happy path” scenario — how does the service return a successful response from the API? NUnit and mstest are common testing tools for. The test is straight forward. The last piece of infrastructure we’ll need is a static class that can return some canned responses that sort of look like the responses that would come back from the OpenWeatherMap API. Conveniently for us, there is a xUnit testing project template out-of-the-box when using visual studio 2017, so we are going to make use of that.The xUnit is an open-source unit testing tool for the .NET framework that simplifies the testing process and allows us to spend more time focusing on writing our tests:Now we have a new project in our solution named web-api-tests. We will write at least 3 different Unit Test Cases for 3 different scenarios. I'm new to unit testing, so my problem is probably with my code and not the Moq framework, but here goes. Unit testing involves testing a part of an application in isolation from its infrastructure and dependencies. .NET Core is now the default standard for any web application development in the .NET world. I modified it slightly and added tests to it and you can find my code for testing live API endpoints using xUnit here. Here's some sample code to get an auth token from an STS given a known username/password (note this is using the IdentityBaseUrl configured above): You can build this into its own test to verify it works. The attribute indicates that this is a test method without any parameters, e.g. This is convenient, as we don't need to have the API running before we run these tests. In addition to the API base URL, once you add auth into the mix you're likely to also need to pass in the base URL for your identity server or STS instance. Preparing the Testing Project. Running the RunAndTest.bat file should produce something like this: That's all you need to write tests that consume live API endpoints, wherever they're running. Conveniently for us, there is a xUnit testing project template out-of-the-box when using visual studio 2019, so we are going to make use of that. Compared to other unit testing frameworks, it stands out with its ease of development and its approach to behaviors like SetUp, TearDown, OneTimeSetup. We don't want any API keys to appear in our code, and in fact it's not really important whether we have a real API key or not, so we'll have to create a service to test with an alternate IOptions object. In the past, I might have used a Visual Studio Web Test for this purpose, but Microsoft is dropping support for these (particularly in the cloud) so I needed a new solution. Testing ensures that your application is doing what it's meant to do. Send inputs to system 5. Line 14 calls the Add method in our repository passing in the person. As you unit test your controller actions, make sure you focus only on their behavior. We will write at least 3 different Unit Test Cases for 3 different scenarios. We will write at least 3 different Unit Test Cases for 3 … The API is protected using JWT Bearer token authorization, and the API uses a secure token server to validate the API requests. In this blog post, I will be covering integration testing of ASP.Net Core Web API application. Integration tests are a great way to test infrastructure connectivity of various components of a solution such as testing request/response to your Web API, against external systems such as databases file systems etc.. Why am I choosing to use xUnit.net as my test framework ASP.NET Core uses it internally to test the product. It will take on a similar structure to the API project so that it will be easier to compare a class to its tests. In this post I will focus on unit testing business logic for ASP.Net Core Web API application. In this demonstration, we will write the Unit Test Cases for CRUD (CREATE, READ, UPDATE and DELETE) operations. If it's doing its job, it should provide you with reasonable confidence that the API is working (or not). While our previous tests were strictly isolated unit tests - the API and the HTTP client were mocked - I'd like the controller tests to be more of an integration test: I'd like to know how it responds to different results from the OpenWeatherService that it depends on. the XUnit is an open souce test framework and main focus of this framework are extensibility and flexibility. If your application supports health checks, which I recommend, your first test can simply target the health check endpoint. Thanks! var handler = new Mock(); var client = new HttpClient(handler.Object); private static StringContent BuildOkResponse(), private static StringContent BuildUnauthorizedResponse(), private static StringContent BuildNotFoundResponse(), private static StringContent BuildInternalErrorResponse(), $ touch ./Tests/Services_Tests/OpenWeatherService_Tests.cs, namespace WeatherWalkingSkeleton.Services. One challenge with scripting the running of ASP.NET Core apps is that by default they expect you to call dotnet run from the project root. In this article, I will explain about the xUnit framework. So, it is similar to the [Fact] attribute, be… This article shows how an ASP.NET Core API could be tested using system tests implemented using XUnit. These posts proved especially helpful in figuring out how to use HttpClient in tests. You then need to add a dependency to the project und… authored the original docs on writing integration tests in ASP.NET Core, an IdentityServer sample that Brock built which you can find here, my code for testing live API endpoints using xUnit here, runs from the root of my GitHub repository, Download the GitHub sample associated with this article here, Avoid Wrapping DbContext in Using (and other gotchas), The test is async. We need to add a reference to our test project so that it can access the classes from the API library under test: Lastly, we’ll add a few directories and test classes to the testing library. You may also need to update your global.jsonto account for this: There are multiple ways to create a new project but all that is required is a project.json in your project folder, which you can create using dotnet new. It might be running locally, or it could be in a local container or Kubernetes cluster with its own IP address or local domain. In a r… It kindly already includes a test method, decorated with [Fact] , a method attribute that's part of the xUnit testing library. If the resource is called without a valid city name, we get a 404 status with “city not found”. Net core. Having a solutionmakes it easier to manage both the class library and the unit test project.Inside the solution directory, create a PrimeService directory. However, sometimes it's worthwhile to be able to test actual, live API endpoints. From testing the API in Postman, we can see that a successful response returns an array of objects that resemble the project’s WeatherForecast class with an HTTP status of 200. A controller unit test avoids things like filters, routing, or mo… Now we’ll add a file for running some controller tests: Just like the service, so far our WeatherForecastController that consumes the OpenWeatherService just has one method called Get for returning the result of the service. If you do some research into this, you'll find that xUnit specifically doesn't allow things like passing inputs in via command line arguments. xUnit.net works with ReSharper, CodeRush, TestDriven.NET and Xamarin. So in our tests, we'll build an OpenWeatherService with the API response that we expect, then build the controller with that. Testing an API endpoint is itself a pretty simple thing to do assuming the API you're testing is running and you can get to it. var result = await sut.GetFiveDayForecastAsync("Chicago"); Assert.IsType>(result); Assert.Equal(new DateTime(1594155600), result[0].Date); $ touch ./Tests/Services_Tests/WeatherForecastController_Tests.cs. Step-5: Build and execute the test project Step-6: There are 2 ways of running Unit test: 1)Through Test Explorer in Visual Studio: Click on Test tab → Select Windows tab → Click on Test Explorer. I'm a big fan of unit tests and integration tests and have written about them frequently. This article will teach you how to use xUnit to ASP.NET The core application does unit testing. First use ASP.NET Core API template to build an application. Net core. This will be a static class, and so far all we need it to do is to return an Options object with one of the OpenWeatherMap configuration objects as its value: Not much happening here, but we’ve got a passable object to build a test OpenWeatherService. Also, our service class uses an IOptions object in order to extract a secret API key to use. The setup for creating the controller as our system under test is as follows (Note, I'll copy in the full method further down): After the controller is created we will await the result and convert it to an OkObjectResult that will contain the API response to evaluate: Lastly, we’ll make sure that a successful response from the OpenWeatherService results in a "success" response from the controller, along with the List object that we're expecting: Altogether, the WeatherForecastController_Tests class should look like this: Run the tests again, and we should have three total successful tests. Here are a couple of responses that we can expect from GetFiveDayForecastAsync: Add a test file in the .Tests/Services_Tests directory: The class, with all of the using statements should start like this: Inside the service, let’s add two methods for each of the descriptions we want to provide. Test1(). When you add a new xUnit test project, you should get a simple test class (UnitTest1) with an empty test method (Test1). Unit testing ASP.Net Core Web API using XUnit for testing framework and Moq for mocking objects. Steve is an experienced software architect and trainer, focusing on code quality and Domain-Driven Design with .NET. Right click on Solution > Add > New Project Go to Installed > Visual C# > Test > xUnit Test Project (.NET Core) Set the name for project as WideWorldImporters.API.UnitTests Click OK Manage references for WideWorldImporters.API.UnitTests project: Now add a reference for WideWorldImporters.API project: The protocol and domain and base route of the API are not hard-coded. Manual testing is a very demanding task, not only for performing the tests themselves but because you have to execute them a huge number of times. Let’s create that project: Next, we add the test project to the WeatherWalkingSkeleton solution: Then, to see that the tests are discoverable, run: If everything is working alright, you’ll see the results of one passing fake test. I also authored the original docs on writing integration tests in ASP.NET Core using TestHost and related types. Most of their tests show as run, but this one never does. We expect it to return a list of WeatherForecast objects. With the service instantiated, we'll call GetFiveDayForecastAsync. In this demonstration, we will not implement CRUD operation in Asp.Net Core Web API … xUnit.net is a free, open source, community-focused unit testing tool for the.NET Framework. Our WeatherForecastController requires an ILogger in the constructor. 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. In this demonstration, we will not implement CRUD operation in Asp.Net Core Web API … To that end, I started from an IdentityServer sample that Brock built which you can find here. It just has an out of the box Web API project I called Test.API. Then, paste the following code which will create the canned responses for our mock HTTP factory to return: Now that we can control the response we get when pretending to call the OpenWeatherMap API, we’ll set up some tests to describe the OpenWeatherService. Create sample project. Right click the solution and select Add then New project. By now, our application is a minimally functional web API that organizes and returns weather data from a location. You can either add the files via command line or scaffold a class with the IDE you’re using: We’ll also create an Infrastructure directory for any fixtures or utilities needed to support the test classes: Lastly, the fake example test can be removed: The OpenWeatherService will be the trickier class to test because it creates an HttpClient object to make calls to a third-party API. Luckily, the Microsoft.Extensions.Logging library that it the interface comes from also has a class called NullLogger that lets us just pass in an empty logger since logging has nothing to do with the functionality that we're testing. xUnit is an open-source unit testing tool for the .Net Framework and offers .NET Core support. It will have a static method called OpenWeatherClientFactory. If you just want to test this out locally, you just need to make sure you launch the web app before you run the tests (if you expect them to pass). xUnit is an open-source unit testing tool for the.Net Framework and offers.NET Core support. Thus, your test might have these properties and set them accordingly: You can configure your default (dev local, perhaps) URLs as constants in another file so you're able to run the tests without having to set the environment variables every time. Open a shell window. I will be using TestServer from the ASP.Net Core Web API testing infrastructure and XUnit for testing framework. [Fact] – attribute states that the method should be executed by the test runner 2. After this a new pane will open on the left side which will contain all the test cases found by the test … In next post I will be covering integration testing of the ASP.Ner Core Web API Controllers using XUnit. Subscribe: http://bit.ly/ChapsasSubSupport me on GitHub: http://bit.ly/ChapsSupportThe giveaway is now over. I am used to using xUnit as testing tool, so this article uses xUnit. [Theory] – attribute implies that we are going to send some parameters to our testing code. In the next tutorial, we’ll start a TDD process for adding exception handling functionality to the controller and service methods. Let’s start by creating a new xUnit Test Project and naming it EmployeesApp.Tests: A new project will prepare a single test class for use, named UnitTest1.cs and will have installed xUnit library and xUnit runner as well: It configures a one-project API solution with IdentityServer for auth. The packages includes a WebApplicationFactory class which is used to bootstrap the API in memory. Testing is the most important process for any software application. It seems a trivial statement, but sometimes this statement is underrated, especially when you change your existing codebase. It could be deployed in Azure or AWS or anywhere else for that matter. Even stranger, if they run the test individually, it runs fine; it's only when they use "Run All" that the test does not appear to run. For this stage of the project, we will add some tests for two of the classes that we’ve built so far: the OpenWeatherService and the WeatherForecastController. This is a nice xUnit feature and one that makes it much nicer to work with async code like. However, with every application development, it is important to unit test your code. In order to run your integration tests, you will need to add a test project to your solution. Since in each test, we’ll need to create a OpenWeatherService, we'll generate IOptions and IHttpClientFactory objects using the fixtures created above, then create an OpenWeatherService named sut for "system under test". It's important that the test be able to have the API's location passed into it. 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. In the test class, we inject the factory into the constructor. Also, note that the class contains a private method called BuildOpenWeatherUrl. xUnit is a free, open-source, testing tool for .NET which developers use to write tests for their applications. Some of those attributes, we are going to use are: 1. Again, this requires the auth server endpoint to be running when you run the test: Now that you have the code to get a token using a known good user/password, building a real API endpoint test is pretty straightforward: You may want to be able to launch the web server and run the tests from a command prompt without having to do any manual work. Kotlin killer features for programmers and software engineers (part 2), Building a realtime multiplayer browser game in less than a day — Part 2/4, Opinionated programming language choice (only 3 languages, not 10, not 20) in 2020, Begin by cloning the project up to this point and. We will mock it using the Moq library: The handler has a method called SendAsync that is called to send the request, so we will use Moq to set up the response that we want: With our fake message handler, we’ll create a real HttpClient object: And then we’ll create a mock IHttpClientFactory that returns our HttpClient. By convention your test projects should reside in a subfolder, test, of the root folder. 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. Lines 6-12 creates a repository and a person with no email address. First use ASP.NET Core API template to build an application. I recently received a tweet from an xUnit.net user wondering why their theory tests using DateTime.Nowdon't run in Visual Studio. This article will demonstrate how to write Unit Test Cases for CRUD operations in Asp.Net Core Web API with xUnit project.In this demonstration, we will write the Unit Test Cases for CRUD(CREATE, READ, UPDATE and DELETE) operations.We will write at least 3 different Unit Test Cases for … Create the Test project. We used this to evaluate successful responses from our service, then to evaluate the same responses in the controller that consumes the service. There are three different test frameworks for Unit Testing supported by ASP.NET Core: MSTest, xUnit, and NUnit; that allow us to test our code in a consistent way. Here are some of the reasons why you would need to use xUnit over other Unit testing frameworks. xUnit is the name of a collection of testing frameworks that became very popular among software developers. We also created some initial infrastructure to control the dependencies that we are not testing as well as create a mock version of a third-party API so that we can control the different responses it might give. And add the API key to the secrets store for this project: Test that the web API is working properly up to now: Write tests to describe the classes’ current functionality. Now we’ll add code to the first method. If you found this helpful, consider helping others find it by retweeting it using the tweet below, along with your own comment. This article will demonstrate how to write Unit Test Cases for CRUD operations in Asp.Net Core Web API with xUnit project. It is a repetitive task, and w… Let’s add directories for any controller and service classes: Then we’ll add the test classes. 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. In this post, we will use xUnit to test how a service handles calls to a third-party API, then how a controller responds to a successful response. The code to do so might look like this: We might be targeting an API that could be running in any number of locations. In this demonstration, we will write the Unit Test Cases for CRUD (CREATE, READ, UPDATE and DELETE) operations. In order to run your integration tests, you will need to add a test project to your solution. var opts = OptionsBuilder.OpenWeatherConfig(); var result = await sut.Get("Chicago") as OkObjectResult; Assert.IsType>(result.Value); namespace WeatherWalkingSkeleton.Tests.Controllers_Tests, https://localhost:5001/weatherforecast?location=detroit, How to mock HttpClient in your .NET / C# unit tests, Choosing the right diagrams to tell your story, Flutter: Internationalization & Switching Locales Manually, DeepLab Image Segmentation on Android with Tf Lite — part 2. However, that's not how xUnit works. Integration Testing ASP.Net Core Web API - Using XUnit, TestServer and FluentAssertions. This article will demonstrate how to write Unit Test Cases for CRUD operations in Asp.Net Core Web API with xUnit project. In order to make the method more versatile, we'll give it two arguments: StringContent content will be the simulated response from the API and HttpStatusCode statusCode will be HTTP response code, e.g. , you will need to add a class called OptionsBuilder.cs the kinds of responses the API is (... You with reasonable confidence that the class contains a private method called BuildOpenWeatherUrl search. Predict a few other scenarios: add a file to the point when we need create. The xUnit is an open-source unit testing framework for.NET developed by Brad Wilson and Jim Newkirk, inventor NUnit... Story or Something like that and dependencies will introduce the project and walk you up to this.. 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Shell window attribute implies that we expect it to return a list of WeatherForecast objects OpenWeatherService xunit api testing API! Xunit.Net is a nice xUnit feature and one that makes it much nicer to work async. A few other scenarios: add a class called OptionsBuilder.cs xUnit, check the unit test Cases for CRUD create. That verifies that the API 's location passed into it testing in our tests, all should decorated. And integration tests, we inject the factory into the constructor you would need make... ] annotation allows a test method should be a public class and the test!