After writing tests for the service, we'll then set up the service with the WeatherForecastController to test that data is returned properly from the API. Here are some of the reasons why you would need to use xUnit over other Unit testing frameworks. 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. Let’s add directories for any controller and service classes: Then we’ll add the test classes. If you’re just here for a walkthrough of testing with xUnit, then you can: … and in another terminal, make a request to make sure a result comes out: If you get what looks like an array of weather forecasts, then you are good to go. Unit tests do not detect issues in the interaction between components—that is the purpose of integration testing. 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. Test1(). xUnit is a free, open-source, testing tool for .NET which developers use to write tests for their applications. It configures a one-project API solution with IdentityServer for auth. If your application supports health checks, which I recommend, your first test can simply target the health check endpoint. What is xUnit. The protocol and domain and base route of the API are not hard-coded. However, that's not how xUnit works. I am used to using xUnit as testing tool, so this article uses xUnit. We will write at least 3 different Unit Test Cases for 3 different scenarios. These aren't always easy tasks in all environments, especially during automated builds, but unfortunately they're outside the scope of this article. Here are the methods: Note that the [Fact] annotation allows a test explorer to find and run any test methods. Comparing xUnit.net to other frameworks. 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. In the test class, we inject the factory into the constructor. Most of their tests show as run, but this one never does. 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. 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. $ git clone -b 2_adding-async --single-branch git@github.com:jsheridanwells/WeatherWalkingSkeleton.git, $ dotnet user-secrets set "OpenWeather:ApiKey" "" --project ./Api/WeatherWalkingSkeleton.csproj, $ dotnet new xunit -o Tests -n WeatherWalkingSkeleton.Tests, $ dotnet sln WeatherWalkingSkeleton.sln add ./Tests/WeatherWalkingSkeleton.Tests.csproj, $ dotnet add Tests/WeatherWalkingSkeleton.Tests.csproj reference Api/WeatherWalkingSkeleton.csproj, $ mkdir ./Tests/Controllers_Tests ./Tests/Services_Tests, $ touch ./Tests/{/Controllers_Tests/WeatherForecastController_Tests.cs,/Services_Tests/OpenWeatherService_Tests.cs}, namespace WeatherWalkingSkeleton.Tests.Infrastructure, $ dotnet add Tests/WeatherWalkingSkeleton.Tests.csproj package Moq. Net core. In this post I will focus on unit testing business logic for ASP.Net Core Web API application. This article will teach you how to use xUnit to ASP.NET The core application does unit 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. If you found this helpful, consider helping others find it by retweeting it using the tweet below, along with your own comment. 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. 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. 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. The dotnet CLI contains a template for adding a xUnit test project, as well as templates for the nUnit and MSTest libraries. When you add a new xUnit test project, you should get a simple test class (UnitTest1) with an empty test method (Test1). Build inputs 4. However, sometimes it's worthwhile to be able to test actual, live API endpoints. Line 14 calls the Add method in our repository passing in the person. It is essentially a testing framework which provides a set of attributes and methods we can use to write the test code for our applications. Override done to close the stream (if it's a file). It's important that the test be able to have the API's location passed into it. Right click the solution and select Add then New project. Before we do anything else, we need to make sure that we reference any projects that we are testing in our xUnit project. To assist in mocking the objects, we’ll add a very common Nuget package called Moq: In Infrastructure, create a ClientBuilder.cs class, also a static class. 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. Create an xUnit project in Visual Studio 2019. By now, our application is a minimally functional web API that organizes and returns weather data from a location. 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. When running the tests, the access token needs to be requested, and used to access the APIs. We want to test how it handles different kinds of responses from the API, but we don't want to actually make those requests. Unit testing ASP.Net Core Web API using XUnit for testing framework and Moq for mocking objects. I recently received a tweet from an xUnit.net user wondering why their theory tests using DateTime.Nowdon't run in Visual Studio. So far, the class contains one method: GetFiveDayForecastAsync. Unit testing involves testing a part of an application in isolation from its infrastructure and dependencies. It might be running locally, or it could be in a local container or Kubernetes cluster with its own IP address or local domain. xUnit.net works with ReSharper, CodeRush, TestDriven.NET and Xamarin. In next post I will be covering integration testing of the ASP.Ner Core Web API Controllers using XUnit. This is to establish a pattern of tests that describe the code, and as the application grows in complexity, we'll be sure new changes won't break prior functionality. With the service instantiated, we'll call GetFiveDayForecastAsync. xUnit is an open-source unit testing tool for the.Net Framework and offers.NET Core support. The code to do so might look like this: We might be targeting an API that could be running in any number of locations. [Fact] – attribute states that the method should be executed by the test runner 2. Since it's a private method, we can't test it in isolation, but since we know that GetFiveDayForecastAsync depends on it, any failures from the private method will be indicated when testing the public method. I will be using TestServer from the ASP.Net Core Web API testing infrastructure and XUnit for testing framework. This article will demonstrate how to write Unit Test Cases for CRUD operations in Asp.Net Core Web API with xUnit project. Create the Test project. This allows us to write xUnit tests, focusing on endpoints in a ASP.NET Core Web API application. In the future, we'll need to update this method to handle any errors that get returned from the API, but for now the test will just describe what the method is supposed to do. It is a repetitive task, and w… xUnit is the name of a collection of testing frameworks that became very popular among software developers. Parameters: Name Type Description; failures: fn: function xunit - 2.2.0-beta2-build3300; dotnet-test-xunit - 2.2.0-preview2-build1029; Microsoft.NETCore.App and Microsoft.AspNetCore.TestHost - 1.0.0; Creating an integration test project. In this blog post, I will be covering integration testing of ASP.Net Core Web API application. But if I want to run the script from the root of my GitHub repository, or from my test project folder, that's obviously a problem. 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. We will write at least 3 different Unit Test Cases for 3 … Fortunately, .NET core has excellent support for MS Test. 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. The test is straight forward. In the next tutorial, we’ll start a TDD process for adding exception handling functionality to the controller and service methods. 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. We used this to evaluate successful responses from our service, then to evaluate the same responses in the controller that consumes the service. After this a new pane will open on the left side which will contain all the test cases found by the test … Compared to other unit testing frameworks, it stands out with its ease of development and its approach to behaviors like SetUp, TearDown, OneTimeSetup. In this demonstration, we will write the Unit Test Cases for CRUD (CREATE, READ, UPDATE and DELETE) operations. xUnit is an open-source unit testing tool for the .Net Framework and offers .NET Core support. xUnit.net is a free, open source, community-focused unit testing tool for the.NET Framework. Otherwise, running $ dotnet test from the command line will suffice for this tutorial. This strategy is a workaround because we cannot mock an HttpClient directly. Ok, so testing a public health check API is pretty simple - what about a secured API endpoint, where you first need to get a token and then you need to present the token during subsequent API calls? 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. I also authored the original docs on writing integration tests in ASP.NET Core using TestHost and related types. 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). 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. var result = await sut.GetFiveDayForecastAsync("Chicago"); Assert.IsType>(result); Assert.Equal(new DateTime(1594155600), result[0].Date); $ touch ./Tests/Services_Tests/WeatherForecastController_Tests.cs. 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. To that end, I started from an IdentityServer sample that Brock built which you can find here. The Moq framework provides an easy mechanism to mock the dependencies which makes it easier to test classes having constructor injection. Git and Github: A Love Story or Something Like That. What is xUnit. xUnit. 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. Set up data through the front door 3. This article will demonstrate how to write Unit Test Cases for CRUD operations in Asp.Net Core Web API with xUnit project. However, with every application development, it is important to unit test your code. In this demonstration, we will not implement CRUD operation in Asp.Net Core Web API … 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: This article will demonstrate how to write Unit Test Cases for CRUD operations in Asp.Net Core Web API with xUnit project. Preparing the Testing Project. 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. the XUnit is an open souce test framework and main focus of this framework are extensibility and flexibility. 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. So in our tests, we'll build an OpenWeatherService with the API response that we expect, then build the controller with that. That's the xUnit project set up. 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. 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. So, if you want to make a flexible, environment-specific test that you can run locally and then your CI server can run within its environment and your deployment can run a post-deployment check to ensure everything works in production, you need to find a different way. You can get a similar set of functionality with VS Code using the .NET Core Test Explorer plugin. 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 API is protected using JWT Bearer token authorization, and the API uses a secure token server to validate the API requests. Net core. 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. Our service gets instantiated with an IHttpClientFactory and we call a CreateClient method from the object to get an HttpClient. 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. 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 … Also, our service class uses an IOptions object in order to extract a secret API key to use. It could be deployed in Azure or AWS or anywhere else for that matter. 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. 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. In order to run your integration tests, you will need to add a test project to your solution. [Theory] – attribute implies that we are going to send some parameters to our testing code. We expect it to return a list of WeatherForecast objects. 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. .NET Core is now the default standard for any web application development in the .NET world. 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. 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. I use it to unit test my Document Controller WPF application (.NET Framework 4.6.1) and in this project, the AutoMapper is heavily used to map domain models to view models. Written by the original inventor of NUnit v2, xUnit.net is the latest technology for unit testing C#, F#, VB.NET and other.NET languages. xUnit is a free, open source Unit testing framework for .Net developed by Brad Wilson and Jim Newkirk, inventor of NUnit. In this post I will focus on unit testing business logic for ASP.Net Core Web API application. Also, note that the class contains a private method called BuildOpenWeatherUrl. Finally, we come to the point when we need to create a new project where our tests are going to be. But, let’s test those validation rules and make sure that everything works as expected. If the resource is called without a valid city name, we get a 404 status with “city not found”. If you are unfamiliar with test concepts and/or xUnit, check the Unit testing C# in .NET Core using dotnet test and xUnit. Subscribe: http://bit.ly/ChapsasSubSupport me on GitHub: http://bit.ly/ChapsSupportThe giveaway is now over. 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. Create sample project. Our WeatherForecastController requires an ILogger in the constructor. A controller unit test avoids things like filters, routing, or mo… xUnit is a unit testing framework which supports .NET Core . In this demonstration, we will write the Unit Test Cases for CRUD (CREATE, READ, UPDATE and DELETE) operations. 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. 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. 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. Send inputs to system 5. Testing ensures that your application is doing what it's meant to do. It just has an out of the box Web API project I called Test.API. Since these are "real" tests, they also need to be able to deal with real authorization. This article will lay out a relatively simple way to do this in a configurable manner using xUnit. First use ASP.NET Core API template to build an application. The packages includes a WebApplicationFactory class which is used to bootstrap the API in memory. Since we do not want to call the actual OpenWeatherMap API, we will set up a substitute class where we can simulate the responses. As someone who has been unit testing for more than 20 years now, I feel your fixation on XUnit is unwarranted. In this demonstration, we will write the Unit Test Cases for CRUD (CREATE, READ, UPDATE and DELETE) operations. The strategy I’ve decided on is to test how the OpenWeatherService responds to different possible responses from the third-party API. 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. 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. These posts proved especially helpful in figuring out how to use HttpClient in 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. In this video, I will be doing integration testing for the ASP.Net Core Web API application. 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. You then need to add a dependency to the project und… From this tutorial, we were able to install a test library for an ASP.NET Core WebApi project. If you are using Visual Studio, there is a built-in test explorer that will provide a UI for running and debugging tests. In this article, I will explain about the xUnit framework. Testing Secure Live API Endpoints with xUnit and IdentityServer Ok, so testing a public health check API is pretty simple - what about a secured API endpoint, where you first need to get a token and then you need to present the token during subsequent API calls? By convention your test projects should reside in a subfolder, test, of the root folder. I'm new to unit testing, so my problem is probably with my code and not the Moq framework, but here goes. 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. This is a nice xUnit feature and one that makes it much nicer to work with async code like. If you would like to start from the beginning, this post will introduce the project and walk you up to this point. 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. Testing Production API Endpoints with xUnithttps://t.co/xsFoZWIHHg. 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. In this video, I will be doing integration testing for the ASP.Net Core Web API application. So, it is similar to the [Fact] attribute, be… Verify direct outputs 6. This article describes how you can use MS Test to write unit test cases for your API. 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