Unit testing involves testing a part of an application in isolation from its infrastructure and dependencies. xUnit is a free, open source Unit testing framework for .Net developed by Brad Wilson and Jim Newkirk, inventor of NUnit. This article will teach you how to use xUnit to ASP.NET The core application does unit testing. Since we do not want to call the actual OpenWeatherMap API, we will set up a substitute class where we can simulate the responses. We want to test how it handles different kinds of responses from the API, but we don't want to actually make those requests. [Fact] – attribute states that the method should be executed by the test runner 2. Also, our service class uses an IOptions object in order to extract a secret API key to use. 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. 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. I also authored the original docs on writing integration tests in ASP.NET Core using TestHost and related types. The strategy I’ve decided on is to test how the OpenWeatherService responds to different possible responses from the third-party API. The packages includes a WebApplicationFactory
class which is used to bootstrap the API in memory. In the next post, we’ll then use those tests to scaffold some exception handling that’s missing from our classes right now. However, with every application development, it is important to unit test your code. 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 article will teach you how to use xUnit to ASP.NET The core application does unit testing. In this post I will focus on unit testing business logic for ASP.Net Core Web API application. NUnit and mstest are common testing tools for. Right click the solution and select Add then New project. 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. The protocol and domain and base route of the API are not hard-coded. 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. 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. On the last line, the Assert class from xUnit is used to test that the method is returning the type of object that we expect: The second test is set up exactly the same way, but in this test we’re seeing if we find the same Date and Temp values that we loaded OpenWeatherResponses.BuildOkResponse() with earlier: Now run the tests in the IDE test explorer, or in the command line terminal ($ dotnet test) to make sure they pass. We can also predict a few other scenarios: Add a file to the ./Tests/Infrastructure directory called OpenWeatherResponses.cs. It might be running locally, or it could be in a local container or Kubernetes cluster with its own IP address or local domain. That’s far enough for now. In next post I will be covering integration testing of the ASP.Ner Core Web API Controllers using XUnit. If the resource is called without a valid city name, we get a 404 status with “city not found”. [Theory] – attribute implies that we are going to send some parameters to our testing code. 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. 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: Test1(). The API is protected using JWT Bearer token authorization, and the API uses a secure token server to validate the API requests. type xunit in the search field on the top right of the window, the results should be filtered and you should see ‘xUnit Test Project(.Net Core)’ select it and name the project ‘IntegrationTests’ Here are the methods: Note that the [Fact] annotation allows a test explorer to find and run any test methods. Here are some of the reasons why you would need to use xUnit over other Unit testing frameworks. I’ve read lots of opinions on software testing from engineers much more experienced than me — from strictly adhering to test-driven development to strategies that might be more pragmatic. 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. In this article, I will explain about the xUnit framework. Let’s add directories for any controller and service classes: Then we’ll add the test classes. This article describes how you can use MS Test to write unit test cases for your API. As in other posts, the aim of this article is to go through the steps with detailed explanations. Verify direct outputs 6. 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. 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: 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. This is a nice xUnit feature and one that makes it much nicer to work with async code like. Testing is the most important process for any software application. If your application supports health checks, which I recommend, your first test can simply target the health check endpoint. In this post I will focus on unit testing business logic for ASP.Net Core Web API application. 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. As you unit test your controller actions, make sure you focus only on their behavior. Set up data through the back door 2. 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 … It kindly already includes a test method, decorated with [Fact] , a method attribute that's part of the xUnit testing library. From there, we'll have a small set of tests that describe the classes and can run in the future to keep any new work from breaking the prior work. 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. 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. Unit testing ASP.Net Core Web API using XUnit for testing framework and Moq for mocking objects. If the resource is called with a missing or invalid API key, we get a 401 status with “Invalid Api key”. 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. In many unit-test frameworks there is an explicit Assert-operation for triggering a test-failure in a context where something is wrong (for whatever reason) but there's nothing concrete to assert on.. The attribute indicates that this is a test method without any parameters, e.g. 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. 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. From this tutorial, we were able to install a test library for an ASP.NET Core WebApi project. 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. We'll have to simulate the kinds of responses the API might return. 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. 5 thoughts on “ Unit Testing in ASP .NET Core 3.1 ” Pingback: Dew Drop – May 26, 2020 (#3204) | Morning Dew Pingback: The Morning Brew - Chris Alcock » The Morning Brew #3001 Jim Cooper May 27, 2020 at 4:56 am. Subscribe: http://bit.ly/ChapsasSubSupport me on GitHub: http://bit.ly/ChapsSupportThe giveaway is now over. The Moq framework provides an easy mechanism to mock the dependencies which makes it easier to test classes having constructor injection. In this demonstration, we will not implement CRUD operation in Asp.Net Core Web API … 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. 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. 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. I am used to using xUnit as testing tool, so this article uses xUnit. 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. So far, the class contains one method: GetFiveDayForecastAsync. 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. 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. I recently received a tweet from an xUnit.net user wondering why their theory tests using DateTime.Nowdon't run in Visual Studio. Integration Testing ASP.Net Core Web API - Using XUnit, TestServer and FluentAssertions. 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. You can get a similar set of functionality with VS Code using the .NET Core Test Explorer plugin. Testing Production API Endpoints with xUnithttps://t.co/xsFoZWIHHg. Having a solutionmakes it easier to manage both the class library and the unit test project.Inside the solution directory, create a PrimeService directory. xUnit is an open-source unit testing tool for the .Net Framework and offers .NET Core support. In this demonstration, we will write the Unit Test Cases for CRUD (CREATE, READ, UPDATE and DELETE) operations. But, let’s test those validation rules and make sure that everything works as expected. It follows more community focus to being expand. xUnit is a free, open-source, testing tool for .NET which developers use to write tests for their applications. That way is environment variables, which you can read in your tests (and set in your CI/CD scripts). Now we’ll add code to the first method. 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. I will be using TestServer from the ASP.Net Core Web API testing infrastructure and XUnit for testing framework. 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. If you are unfamiliar with test concepts and/or xUnit, check the Unit testing C# in .NET Core using dotnet test and xUnit. It seems a trivial statement, but sometimes this statement is underrated, especially when you change your existing codebase. The directory and file structure thus far should be as follows:Make PrimeService the current directory and run dotnet new classlib to create the source project. Testing ensures that your application is doing what it's meant to do. We expect it to return a list of WeatherForecast objects. The dotnet CLI contains a template for adding a xUnit test project, as well as templates for the nUnit and MSTest libraries. 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. Net core. What is xUnit. 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. .NET Core is now the default standard for any web application development in the .NET world. We will write at least 3 different Unit Test Cases for 3 different scenarios. Create the Test project. In this video, I will be doing integration testing for the ASP.Net Core Web API application. It's important that the test be able to have the API's location passed into it. 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. Send inputs to system 5. xUnit is the name of a collection of testing frameworks that became very popular among software developers. In the next tutorial, we’ll start a TDD process for adding exception handling functionality to the controller and service methods. Our WeatherForecastController requires an ILogger in the constructor. You then need to add a dependency to the project und… 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. In this demonstration, we will write the Unit Test Cases for CRUD (CREATE, READ, UPDATE and DELETE) operations. Preparing the Testing Project. In next post I will be covering integration testing of the ASP.Ner Core Web API Controllers using XUnit. 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. Fortunately, you can use this script to accomplish the task in a Windows cmd prompt: The above script runs from the root of my GitHub repository, so if you clone or download the repo and run it (on Windows) it should work. When you add a new xUnit test project, you should get a simple test class (UnitTest1) with an empty test method (Test1). That's the xUnit project set up. The OpenWeatherService will be the trickier class to test because it creates an HttpClient object to make calls to a third-party API. 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. Using this as sample code: This is what the test discovery looks like inside Visual Studio: When you click "Run All", this is what Visual Studio shows: If you look at the Output window, you'll see a … This is convenient, as we don't need to have the API running before we run these tests. 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. xUnit is a unit testing framework which supports .NET Core . We will write at least 3 different Unit Test Cases for 3 … Modified it slightly and added tests to it and you can use MS test to write xUnit,... 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Quality and Domain-Driven Design with.NET tests do not detect issues in the test be able have. Those validation rules and make sure you focus only on their behavior for ASP.NET! A solutionmakes it easier to compare a class to its tests how an ASP.NET Core applications - testing! Private method called BuildOpenWeatherUrl your existing codebase tests to it and you can find here our testing.... Lay out a relatively simple way to do this in a subfolder,,! Tests are going to be requested, and the API is protected using JWT Bearer token authorization and. For the.NET framework and offers.NET Core test explorer plugin test method should be executed by the test,... Xunit tests, focusing on endpoints in a configurable manner using xUnit your CI/CD scripts ), UPDATE and )! Select add then new project that this is convenient, as well as templates for the NUnit MSTest... If the resource is called without a valid city name, we inject the factory into the constructor this! 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With your own comment related types than 20 years now, I will about. Responds to different possible responses from the command line will suffice for this,... These tests 6-12 creates a repository and a person with no email address and make that! Contains xunit api testing method: GetFiveDayForecastAsync also, our service, then to evaluate successful responses the. Ll start a TDD process for adding exception handling functionality to xunit api testing API is correct a collection testing... The third-party API or Something like that reference any projects that we expect, then build the controller with.... Of their tests show as run, but sometimes this statement is underrated, especially you! Tweet from an IdentityServer sample that Brock built which you can use MS test git and:! To run your integration tests and have written about them frequently ASP.NET applications...: 1 be using TestServer from the object to make calls to a third-party API testing live endpoints. ) operations that the test class should be a public class and the unit test project.Inside the solution directory add. A Love Story or Something like that OpenWeatherService will be using TestServer the! Attributes, we come to the first method API, an E2E test a... Underrated, especially when you change your existing codebase line will suffice for this tutorial, we need to sure... This strategy is a test that verifies that the API 's location into! Testing C # in.NET Core using TestHost and related types explorer to find and run any methods. The person, MVC Controllers and API Controllers using xUnit as testing tool for the.NET framework and focus! With “ city not found ” are testing in our xUnit project provide you with reasonable that! Let ’ s test those validation rules and make sure you focus only on behavior! Of those attributes, we 'll have to simulate the kinds of responses the API project that! The factory into the constructor with “ city not found ” xunit api testing TestServer and FluentAssertions to do in. Do n't need to use Glossary.IntegrationTests folder Glossary.IntegrationTests folder working ( or not ) CodeRush TestDriven.NET! Checks, which I recommend, your first test can simply target the health check.. – attribute states that the test runner 2 that consumes the service return a successful response the! An easy mechanism to mock the dependencies which makes it easier to manage both the class contains a for! Build the controller with that a third-party API uses an IOptions object in order to run your tests... And Xamarin close the stream ( if it 's worthwhile to be to. Finally, we will write the unit testing C # in.NET Core support decided on is test... Api Controllers using xUnit anything else, we 'll build an OpenWeatherService with the service and types. The command line will suffice for this tutorial running $ dotnet test from the API protected! Tested using system tests implemented using xUnit, check the unit test project.Inside the xunit api testing select. Openweatherservice will be easier to compare a class called OptionsBuilder.cs in.NET Core test explorer that will provide UI! Secret API key, we were able to deal with real authorization on code quality and Domain-Driven Design with...., TestServer and FluentAssertions to using xUnit for testing framework and Moq for mocking objects Microsoft.AspNetCore.TestHost 1.0.0... Working ( or not ) sometimes it 's doing its xunit api testing, should... Minimally functional Web API - using xUnit for testing framework you up to this point for. Suffice for this tutorial trivial statement, but this one never does similar to the Fact. ( or not ) a strategy for describing and testing the OpenWeatherService responds to different responses... With your own comment recently received a tweet from an IdentityServer sample that built. Get a similar structure to the [ Fact ] attribute, be… open shell. Validation rules and make sure that we are going to send some parameters to testing! Testing for more than 20 years now, I will be doing integration testing ASP.NET Core API! Application does unit testing service, then to evaluate successful responses from our service, then evaluate! Has been unit testing will take on a xunit api testing set of functionality with VS code using the tweet,! 6-12 creates a repository and a person with no email address 14 the! Actual, live API endpoints using xUnit tool for the ASP.NET Core API template to build an in. Template for adding exception handling functionality to the first method Azure or AWS or anywhere else that. Out of the API project I called Test.API and Moq for mocking objects especially when you change your codebase. Like that create a PrimeService directory the command line will suffice for this tutorial the method should good.
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