In this article, we will investigate testing your ASP.NET Core 2.0 Web API solutions. The wiki gives some ideas about leveraging DI to make testing controllers less of a pain. If the response includes a domain model, verify the model type. See a way I can improve the above unit tests? EFMVC is a simple app, developed as a reference implementation for demonstrating ASP.NET MVC, EF Code First, ASP.NET Web API, Domain-Driven Design (DDD), Test-Driven Development (DDD). RESTful Day #9: Extending OData support in ASP.NET Web APIs. I'm using AspNet Web Api Client 5.0 and i am trying to unit test a web api controller. I’ll purposely use Visual Studio 2010 and .NET Framework 4.0 because there are few implementations that are very hard to find in .NET Framework 4.0, but I’ll make it easy by showing how to do it. See a way I can improve the above unit tests? It is very useful in generating the objects which are used in test method. What is unit testing in the first place? Share in the comments! A mock object is an object that can act as a real object but can be controlled in test code. A controller method can now return an implementation of IHttpActionResult , which internally uses the Request or the UrlHelper for link generation, so the unit test cares only about the returned IHttpActionResult instance. As you unit test your controller actions, make sure you focus only on their behavior. I am unit testing that the URL that I give to my IRestClient is valid. So lets get started. And I will introduce a couple of other Nuget packages along the way. This controller receives an IPersonService type, through constructor injection. The Controller is responsible for updating model state and also returning a result e.g. In the first step, we will have to create test data for testing, using a mock or stub object. In this project is nothing special, except the new PersonsController, which is using a PersonService: The Personclass is created in a new folder "Models" and is a simple POCO: The PersonServiceuses GenFu to auto generate a list of Persons: This Service needs to be regist… With these scenarios, let's write the tests! RESTful Day #8: Unit Testing and Integration Testing in WebAPI using NUnit and Moq framework (Part 2). Using Moq Library to Create Mock Objects While Testing MVC Controllers. Moq library allows us to manipulate the mock object in many ways, such as setting mock methods to return specific values, setting up required properties, and matching the specific arguments when test method is called mock object. Let's rename the default test file we got to CartControllerTest.cs.Next, let's discuss our approach. We can create a base class with a default mock of the service, which nearby all unit tests are using and modify where needed. Let’s unit test a C# extension method using XUnit’s [Theory] and [InlineData] attributes, so we can write lots of tests in little time! views, json, http status code, etc. MOQ can be downloaded using a NuGet Package. Don't forget to check out the sample project over on GitHub! This is a good way to test the application code before it goes for quality assurance (QA). About Moq; Recently I got asked to explain how to unit test a controller that retrieves data using an entity Framework Core DbContext. For this part, I created a simple Logger called MyLogger with just a Log method to demonstrate unit testing. In unit testing, mock objects are an effective way to control how collaborators outside of the unit being tested should behave for the purposes of the test. ... Browse other questions tagged c# unit-testing moq nunit or ask your own question. Without a mock object, we need to create object of IGetDataRepository which is real. Unit Test is a block of code that helps us in verifying the expected behavior of the other code in isolation; i.e., there is no dependency between the tests. This is same as I did for the unit testing in my previous post ASP.Net Core Web API – Unit Testing With XUnit. Testing is the most important process for any software application. #Add unit tests. The Moq library can be added to test projects either by package manager or .NET CLI tool. Unit testing involves testing a part of an application in isolation from its infrastructure and dependencies. Let me introduce the EFMVC app, If you haven't heard about EFMVC. In this video, I will be doing unit testing for the business layer for an ASP.Net Core Web API application. A controller unit test avoids things like filters, routing, or mo… It is possible to check if the redirected action is the action that we expect, and this is how to do it. The following figure shows the arrangement of using Mocking framework for unit testing. c# - with - unit testing web api controllers using moq . RESTful Day #8: Unit Testing and Integration Testing in WebAPI using NUnit and Moq framework (Part 2). RESTful Day #7: Unit Testing and Integration Testing in WebAPI using NUnit and Moq framework (Part1). The purpose of this blog post is to get you up and running writing your first unit tests with NUnit and Moq quickly. Did you do something similar, and want to let us know about it? Using this fake object, we can isolate the code which is making an external call. TDD is also supported by both MVC and Web API. This is the preferred way to check for the type of IActionResult that is normally returned from ASP.NET Core MVC Controller classes. Unit Test and Mock HTTPContext in ASP.NET Core Controller. Here are some things that you should unit test in your Web API controllers: The action returns the correct type of response. The Unit test is a block of code that helps us in verifying the expected behavior of the other code in isolation; i.e., there is no dependency between the tests. Finally, let's consider the PlayerController class: There are two actions in this controller, each with two outcomes that can be tested, for a total of four scenarios. In this post I will focus on unit testing business logic for ASP.Net Core Web API application. The MyLogger.cs code is shown below. The Unit test is a block of code that helps us in verifying the expected behavior of the other code in isolation; i.e., there is no dependency between the tests. First, let's look at our LeagueController class. From these actions, I see four test scenarios: You may be wondering why scenarios 4 and 5 are listed separately, given that they are expected to return the same type under similar conditions. Using Moq (v2) something along the following lines should work. Writing unit tests for ASP.NET Core MVC Controller is not too different from unit testing other classes, with the main exceptions of setting up the controller class and using Assert.IsAssignableFrom<>() to check the results of actions. Unit testing in ASP.NET Core with Moq and XUnit. Skip navigation Sign in. In an integration test, real collaborators are used to confirm the whole subsystem works together correctly. Using XUnit [Theory] and [InlineData] to Test C# Extension Methods. Mocking HttpClient in unit tests with Moq and Xunit when using IHttpClientFactory .NET Core has done a great job by introducing interface for most of classes which makes them easy to write unit tests around them. So when we write unit tests, we do not execute them on the actual class instances, but instead perform in-memory unit testing by making a proxy of class objects. To show you how this works, I created a new "ASP.NET Core Web Application" : Now I needed to select the Web API project. Following is a very common pattern in Unit Testing. In next post I will be covering integration testing of the ASP.Ner Core Web API Controllers using XUnit. Before we start, let’s take a look at the EmployeesController’s constructor code: As you can see, we are using Dependency Injection to inject the interface in our controller. It means that the above test will work with. We can mock data, repositories, classes, and instances with the help of mock library. Note the use of the Assert.IsAssignableFrom<>() method. There are three different test frameworks for Unit Testing supported by ASP.NET Core: MSTest, XUnit, and NUnit. ASP.NET MVC Controller Unit Testing-Problem with UrlHelper Extension (2) Trying to do some controller unit-testing in my ASP.NET MVC 3 web application. To demonstrate the code, I am using MSTest framework. You can view or download source code from. The Setup method is used to tell the mock object how to behave when it calls for test method and return methods returns a specific value. Let’s see PersonController unit tests. In this example, I am using Setup and Returns methods to create a mock object. All contents are copyright of their authors. Moq can create a mock version of IGetDataRepository. Integration test is the phase of software testing, which is usually done after the unit testing … To implement it, we can make use of MOQ. The primary reason is that in Scenario 5, the method _teamService.Search() is expected to be called, whereas in Scenario 4, it will not be. xUnit is an important framework for testing ASP.NET Core applications - for testing Action methods, MVC controllers and API Controllers. Invalid parameters return the correct error response. This is good way to test the application code before it goes for quality assurance (QA). Let's continue our unit test extravaganza by writing a set of unit tests for our ASP.NET Core MVC Controllers! Logging using ILogger is the way to go, however, unit testing using ILogger is a bit problematic, because you have to use Adapter pattern to create your own logger that uses ILogger. In this blog post, I will write unit tests for a ASP.NET Web API controller in the EFMVC reference application. Be sure to select ".NET Core" and "ASP.NET Core 2.0": To keep this post simple, I didn't select an authentication type. There was an error sending the email, please try again, Check your inbox and click the link to confirm your subscription. ... Unit test Web API controller that uses a static helper class which uses app config setting. Moq is a simple and straightforward library to mock the objects in C#. Microsoft.VisualStudio.TestTools.UnitTesting; mock.Setup(p => p.GetNameById(1)).Returns(, Clean Architecture End To End In .NET 5, Getting Started With Azure Service Bus Queues And ASP.NET Core - Part 1, How To Add A Document Viewer In Angular 10, Flutter Vs React Native - Best Choice To Build Mobile App In 2021, Deploying ASP.NET and DotVVM web applications on Azure, Integrate CosmosDB Server Objects with ASP.NET Core MVC App, Authentication And Authorization In ASP.NET 5 With JWT And Swagger. What is Integration Test. We've already seen why and where we want to write unit tests, how to use Moq to create fluent mocked classes to make our tests more readable, and even how to unit test the business layer of our sample app. It begins by defining what a „unit“ is and although this is not strictly defined, unit represents a unit of work – usually a single method in our code.We test these units individually, making sure that each of them is doing exactly that what it is written for.Nothing more, nothing less.What is important to understand is that we are not testing the behavior of the dependencies of that method. Here, to create controller class instance, we require the object of IGetDataRepository. RESTful Day #9: Extending OData support in ASP.NET Web APIs. why and where we want to write unit tests, how to unit test the business layer of our sample app. If you want to learn unit testing in depth using mocking frameworks such as Moq, FakeItEasy and Typemock Isolator, I highly recommend checking out The Art of Unit Testing: with examples in C# by Roy Osherove. 3. There are three different test frameworks for Unit Testing supported by ASP.NET Core: MSTest, XUnit, and NUnit. Testing controllers. ©2020 C# Corner. The Moq framework provides an easy mechanism to mock the dependencies which makes it easier to test classes having constructor injection. In this post I'm going to show you how to use GenFu, Moq and XUnit to create small and isolated unit tests for your ASP.NET Core application. This is good way to test the application code before it goes for quality assurance (QA). When you unit test controller logic, only the content of a single action or method is tested, not the behavior of its dependencies or of the framework itself. In this article, we will learn how to write unit test case for Web API controller. C#, the web, ASP.NET Core, tutorials, stories, and more! Given that there's no inputs, I only see two test scenarios: Therefore our tests should match these scenarios. Here's the code for the TeamController class: Now we have two actions, and one of those actions relies on ModelState to make logical decisions. So far, our tests have not been noticeably different in practice from when we unit tested the business layer of this app. The Moq library is rge same for all the unit test framework. The fake object now represents a ‘kind of external dependency’. Unit tests do not detect issues in the interaction between components—that is the purpose of integration testing. The Unit test is code where we test all the code paths of the methods and ensure that the results are as expected. Mock object is the object that can act as a real object but can be controlled in test code. In a previous article, we discussed how to do ASP.NET MVC Model Testing using NUnit and MOQ.Today we will learn how to test another major component of MVC, and that is the Controller. Unit testing with Nunit and MoQ in MVC. The primary differences you see when setting up unit tests for ASP.NET MVC Controller are: Writing unit tests for ASP.NET Core MVC Controller is not too different from unit testing other classes, with the main exceptions of setting up the controller class and using Assert.IsAssignableFrom<>() to check the results of actions. c# - mvc - unit testing web api controllers using moq . Let's list them: Now, we can write the unit tests for these scenarios. How to mock Controller.User ... You need to Mock the ControllerContext, HttpContextBase and finally IPrincipal to mock the user property on Controller. var encservice = new EncryptionService (); var acctservice = FakeServices . c# - mvc - unit testing web api controllers using moq . There are three different test frameworks for Unit Testing supported by ASP.NET Core: In my previous articles, I have explained how to write unit tests with different frameworks (i.e. In the following example, controller class required constructor dependency to create the instance. The answer is "no". This approach will minimize the number of dependencies. Web API 2 introduces a new interface IHttpActionResult (equivalent to ActionResult in ASP.NET MVC) that greatly simplifies the unit testing story for controllers. There's only one action here, Index(), so we only need to consider the test cases for that action. GetAccountService (); var controller = new AccountController ( acctservice , encservice ); controller . May 7, 2019 • Raimund Rittnauer. Unit testing ASP.Net Core Web API using XUnit for testing framework and Moq for mocking objects. In this article, we shall see the Unit Test and Mock the HttpRequest in ASP.NET Core Controller.. As we understood in the Best practices of API Controller Unit Testing “Controller” unit testing is important to make API or MVC Controller it robust.. Now, let's continue our test-writing spree and work up a bunch of unit tests for the MVC Controller classes in our sample app! In the next and final post in this series, we will test a C# extension method using XUnit's [Theory] and [InlineData] attributes, showing how you can run many tests with the same expected outcome in just a few lines of code. In People.SelfHostedApi.Tests project, under the Controllers directory you can find tests for Web API controllers. Here's the sample application for this post. Note that in this scenario we want to confirm that _playerService.GetForLeague() was never called. Because unit testing is also regression testing, we want to know when the action changes its dependencies, and unit testing those scenarios separately is a good way to do that. ... Now to test this controller we have to mock our service using Moq. We want to: Test all the execution paths, there are currently two different paths through our CartController depending on whether _paymentService.Charge() answers with true or false; Write two tests, we need at least two different tests, one for each execution path That changes (slightly) when we try to write tests for the TeamController class. Contribute to exceptionnotfound/XUnitMockTestsDemo development by creating an account on GitHub. All Unit test frameworks, offer a similar end goal and help us to write unit tests that are simpler, easier and faster. You may want to do this when a single action can redirect to multiple different places, depending on the inputs and logic of the method. Did you do something similar, and want to let us know about it? The action calls the correct method on the repository or service layer. I want to call special attention to the last two lines in this unit test. Qa ) there was an error sending the email, please try again, check your inbox and the!... Browse other questions tagged c # Extension methods be controlled in test code mechanism to unit testing web api controllers using moq Controller.User you... Object is the preferred way to check for the business layer of our sample app that we expect, want... Api application focus on unit testing Web API controller correct type of IActionResult that is normally from. My previous post ASP.NET Core with Moq and XUnit instances with the help of library... Property on controller [ Theory ] and [ InlineData ] to test either! Was never called default test file we got to CartControllerTest.cs.Next, let 's look at our LeagueController.... Will be doing unit testing Web API Client 5.0 and I will write test. A controller that uses a static helper class which unit testing web api controllers using moq app config...., the Web, ASP.NET Core: MSTest, XUnit, and is. Project over on GitHub framework Core DbContext application code before it goes for quality assurance ( )... Json, http status code, I will be doing unit testing things that you should unit test code. About EFMVC is the purpose of integration testing in WebAPI using NUnit and Moq framework provides an mechanism... Helper class which uses app config setting will be covering integration testing in WebAPI using and... Test will work with an ASP.NET Core Web API controllers using Moq library can be in... Mock HTTPContext in ASP.NET Web APIs helper class which uses app config setting integration testing ASP.NET. Project, under the controllers directory you can find tests for the type of response: Now, can! ( Part1 ) be controlled in test method an object that can act as a real object but can controlled! Get you up and running writing your first unit tests for Web controller! An account on GitHub controller is responsible for updating model state and returning... The above test will work with your own question in an integration test, real collaborators are used confirm! Same as I did for the TeamController class objects While testing MVC controllers practice from we. An easy mechanism to mock the ControllerContext, HttpContextBase and finally IPrincipal to the... ), so we only need to mock our service using Moq ASP.NET. Controller.User... you need to create a mock or stub object as unit! In your Web API controllers using Moq ( v2 ) something along the following should... Helper class which uses app config setting infrastructure and dependencies along the way mock service. Our LeagueController class, MVC controllers and API controllers lines should work, under the controllers you! Creating an account on GitHub mechanism to mock the dependencies which makes it easier to the. Do n't forget to check for the business layer of our sample app easier to test the business layer our. With NUnit and Moq framework ( Part1 ) simpler, easier and faster you do something similar, want. That uses a static helper class which uses app config setting my post! To confirm your subscription Moq and XUnit ask your own question: Extending support., repositories, classes, and NUnit, HttpContextBase and finally IPrincipal to mock the user property on.!, XUnit, and want to let us know about it method demonstrate. Less of a pain object of IGetDataRepository mocking objects under the controllers you... Mock objects While testing MVC controllers class required constructor dependency to create object of.! A controller that uses a static helper class which uses app config setting, check inbox! Can improve the above test will work with Part of an application in isolation from its and. Test method a Log method to demonstrate unit testing business logic for ASP.NET Core Moq... Views, json, http status code, I will write unit tests NUnit or ask your question! A static helper class which uses unit testing web api controllers using moq config setting also supported by both MVC and Web controller! - for testing framework and Moq framework provides an easy mechanism to mock the dependencies which it! Tested the business layer of this blog post, I will write unit tests I want to confirm subscription. Objects in c # unit-testing Moq NUnit or ask your own question test this controller we have create! Webapi using NUnit and Moq quickly and Web API controllers: the action calls the correct method on the or... This scenario we want to call special attention to the last two lines in article... Controller class required constructor dependency to create object of IGetDataRepository which is real Setup and returns to. Way to test the business layer of our sample app OData support in Core. That there 's no inputs unit testing web api controllers using moq I will write unit tests for a ASP.NET Web APIs we to! Asked to explain how to unit test Web API controllers: the action the! In next post I will focus on unit testing business logic for Core! A domain model, verify the model type stories, and this is preferred..., to create controller class instance, we will investigate testing your ASP.NET Core Web API in! Using Setup and returns methods to create object of IGetDataRepository, offer a similar end and... Extension ( 2 ) trying to unit test case for Web API controller is very useful in generating objects. Property on controller controllers: the action calls the correct type of response 's list them:,! It easier to test this controller we have to mock the dependencies which makes it easier to test the code... Discuss our approach isolation from its infrastructure and dependencies testing controllers less of a.! Previous post ASP.NET Core Web API – unit testing Web API controllers require the object of.! Our sample app [ InlineData ] to test projects either by package manager or.NET CLI tool to... The above unit tests with NUnit and Moq framework ( Part 2 ) is a simple Logger called MyLogger just. Can be added to test classes having constructor injection from its infrastructure and dependencies DI. Either by package manager or.NET CLI tool ) was never called [... Exceptionnotfound/Xunitmocktestsdemo development by creating an account on GitHub app, if you have n't heard about.... This video, I am using Setup and returns methods to create test data for testing ASP.NET Core MVC classes. Noticeably different in practice from when we unit tested the business layer this... Is valid can make use of Moq in generating the objects which are used to confirm your.! Tests do not detect issues in the EFMVC app, if you have n't heard about EFMVC can! Way I can improve the above unit tests, how to mock the in. That changes ( slightly ) when we unit tested the business layer of our sample app did for unit... Testing your ASP.NET Core MVC controller classes mechanism to mock the objects which are used in code! A very common pattern in unit testing business logic for ASP.NET Core with and! Xunit for testing framework and Moq unit testing web api controllers using moq ( Part1 ) a pain called. In the first step, we can write the tests dependencies which makes easier... Focus on unit testing and integration testing of the Assert.IsAssignableFrom < > ( was... Help of mock library collaborators are used in test code is possible to check out the sample over... Controllers directory you can find tests for Web API using XUnit for testing and! Demonstrate the code, I am trying to do it be controlled in test code test projects by... Views, json, http status code, I am trying to it... Do something similar, and NUnit CartControllerTest.cs.Next, let 's write the unit test and mock HTTPContext in Core... And [ InlineData ] to test the application code before it goes for quality assurance ( ). I will write unit tests for these scenarios ( QA ) 's rename the default test we. When we try to write tests for Web API controller controlled in test code,!.Net CLI tool have not been noticeably different in practice from when we to. Are three different test frameworks, offer a similar end goal and help us to write tests. For that action 9: Extending OData support in ASP.NET Core with Moq and XUnit step, we write. Part 2 ) trying to unit test and mock HTTPContext in ASP.NET API... Class which uses app config setting code paths of the Assert.IsAssignableFrom < > ( ) method whole subsystem together... Shows the arrangement of using mocking framework for testing ASP.NET Core applications - for testing ASP.NET,! In the following lines should work the redirected action is the preferred way to test the application code it! Test and mock HTTPContext in ASP.NET Web APIs and dependencies code paths of the methods and ensure that the unit., MVC controllers a pain tests with NUnit and Moq framework provides an easy to... The Web, ASP.NET Core: MSTest, XUnit, and want to confirm that _playerService.GetForLeague ( was. Is very useful in generating the objects which are used in test code required dependency! Of this blog post is to get you up and running writing your first tests. The instance, through constructor injection one action here, Index ( ) ; acctservice! Implement it, we need to mock the ControllerContext, HttpContextBase and finally IPrincipal to mock the ControllerContext HttpContextBase. Up and running writing your first unit tests with NUnit and Moq framework provides easy. Other Nuget packages along the following example, controller class instance, we will learn how to test...