In the following example, controller class required constructor dependency to create the instance. Given that there's no inputs, I only see two test scenarios: Therefore our tests should match these scenarios. Let's list them: Now, we can write the unit tests for these scenarios. I want to call special attention to the last two lines in this unit test. why and where we want to write unit tests, how to unit test the business layer of our sample app. In an integration test, real collaborators are used to confirm the whole subsystem works together correctly. A controller unit test avoids things like filters, routing, or mo… The fake object now represents a ‘kind of external dependency’. 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.. Let's continue our unit test extravaganza by writing a set of unit tests for our ASP.NET Core MVC Controllers! About Moq; The MyLogger.cs code is shown below. The Moq library is rge same for all the unit test framework. Using XUnit [Theory] and [InlineData] to Test C# Extension Methods. Let’s see PersonController unit tests. 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. You can view or download source code from. To demonstrate the code, I am using MSTest framework. May 7, 2019 • Raimund Rittnauer. Let's rename the default test file we got to CartControllerTest.cs.Next, let's discuss our approach. In this article, we will investigate testing your ASP.NET Core 2.0 Web API solutions. The action calls the correct method on the repository or service layer. Using Moq Library to Create Mock Objects While Testing MVC Controllers. In this post I will focus on unit testing business logic for ASP.Net Core Web API application. 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. In this blog post, I will write unit tests for a ASP.NET Web API controller in the EFMVC reference application. In this video, I will be doing unit testing for the business layer for an ASP.Net Core Web API application. 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. The purpose of this blog post is to get you up and running writing your first unit tests with NUnit and Moq quickly. This is good way to test the application code before it goes for quality assurance (QA). 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… ©2020 C# Corner. This is same as I did for the unit testing in my previous post ASP.Net Core Web API – Unit Testing With XUnit. What is Integration Test. The following figure shows the arrangement of using Mocking framework for unit testing. MOQ can be downloaded using a NuGet Package. It is very useful in generating the objects which are used in test method. There's only one action here, Index(), so we only need to consider the test cases for that action. There are three different test frameworks for Unit Testing supported by ASP.NET Core: MSTest, XUnit, and NUnit. Did you do something similar, and want to let us know about it? There are three different test frameworks for Unit Testing supported by ASP.NET Core: MSTest, XUnit, and NUnit. c# - mvc - unit testing web api controllers using moq . The Controller is responsible for updating model state and also returning a result e.g. 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. That changes (slightly) when we try to write tests for the TeamController class. RESTful Day #9: Extending OData support in ASP.NET Web APIs. Invalid parameters return the correct error response. 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. Testing is the most important process for any software application. Integration test is the phase of software testing, which is usually done after the unit testing … In this article, we will learn how to write unit test case for Web API controller. Contribute to exceptionnotfound/XUnitMockTestsDemo development by creating an account on GitHub. Here's the sample application for this post. Let me introduce the EFMVC app, If you haven't heard about EFMVC. RESTful Day #8: Unit Testing and Integration Testing in WebAPI using NUnit and Moq framework (Part 2). 3. ... Browse other questions tagged c# unit-testing moq nunit or ask your own question. Note the use of the Assert.IsAssignableFrom<>() method. We can create a base class with a default mock of the service, which nearby all unit tests are using and modify where needed. Following is a very common pattern in Unit Testing. 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 the first step, we will have to create test data for testing, using a mock or stub object. 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). 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! Here are some things that you should unit test in your Web API controllers: The action returns the correct type of response. 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! 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. This is a good way to test the application code before it goes for quality assurance (QA). And I will introduce a couple of other Nuget packages along the way. Unit tests do not detect issues in the interaction between components—that is the purpose of integration testing. C#, the web, ASP.NET Core, tutorials, stories, and more! If the response includes a domain model, verify the model type. The Unit test is code where we test all the code paths of the methods and ensure that the results are as expected. 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. 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. Note that in this scenario we want to confirm that _playerService.GetForLeague() was never called. 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. 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. With these scenarios, let's write the tests! 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. Recently I got asked to explain how to unit test a controller that retrieves data using an entity Framework Core DbContext. The Moq framework provides an easy mechanism to mock the dependencies which makes it easier to test classes having constructor injection. ... Now to test this controller we have to mock our service using Moq. xUnit is an important framework for testing ASP.NET Core applications - for testing Action methods, MVC controllers and API Controllers. So far, our tests have not been noticeably different in practice from when we unit tested the business layer of this app. This controller receives an IPersonService type, through constructor injection. Unit testing with Nunit and MoQ in MVC. 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 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. Here, to create controller class instance, we require the object of IGetDataRepository. Share in the comments! All Unit test frameworks, offer a similar end goal and help us to write unit tests that are simpler, easier and faster. TDD is also supported by both MVC and Web API. #Add unit tests. Unit Test and Mock HTTPContext in ASP.NET Core Controller. Using this fake object, we can isolate the code which is making an external call. For this part, I created a simple Logger called MyLogger with just a Log method to demonstrate unit testing. Moq can create a mock version of IGetDataRepository. 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. Did you do something similar, and want to let us know about it? 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. In next post I will be covering integration testing of the ASP.Ner Core Web API Controllers using XUnit. First, let's look at our LeagueController class. So lets get started. 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. The Moq library can be added to test projects either by package manager or .NET CLI tool. This is good way to test the application code before it goes for quality assurance (QA). It means that the above test will work with. Web API 2 introduces a new interface IHttpActionResult (equivalent to ActionResult in ASP.NET MVC) that greatly simplifies the unit testing story for controllers. 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. 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 Unit testing ASP.Net Core Web API using XUnit for testing framework and Moq for mocking objects. In People.SelfHostedApi.Tests project, under the Controllers directory you can find tests for Web API controllers. 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. This is the preferred way to check for the type of IActionResult that is normally returned from ASP.NET Core MVC Controller classes. Mock object is the object that can act as a real object but can be controlled in test code. Be sure to select ".NET Core" and "ASP.NET Core 2.0": To keep this post simple, I didn't select an authentication type. Testing controllers. 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. views, json, http status code, etc. 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. Moq is a simple and straightforward library to mock the objects in C#. A mock object is an object that can act as a real object but can be controlled in test code. 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. 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. var encservice = new EncryptionService (); var acctservice = FakeServices . 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. How to mock Controller.User ... You need to Mock the ControllerContext, HttpContextBase and finally IPrincipal to mock the user property on Controller. It is possible to check if the redirected action is the action that we expect, and this is how to do it. In this example, I am using Setup and Returns methods to create a mock object. To show you how this works, I created a new "ASP.NET Core Web Application" : Now I needed to select the Web API project. What is unit testing in the first place? Without a mock object, we need to create object of IGetDataRepository which is real. Unit testing in ASP.NET Core with Moq and XUnit. RESTful Day #7: Unit Testing and Integration Testing in WebAPI using NUnit and Moq framework (Part1). GetAccountService (); var controller = new AccountController ( acctservice , encservice ); controller . See a way I can improve the above unit tests? The answer is "no". c# - with - unit testing web api controllers using moq . As you unit test your controller actions, make sure you focus only on their behavior. RESTful Day #8: Unit Testing and Integration Testing in WebAPI using NUnit and Moq framework (Part 2). Don't forget to check out the sample project over on GitHub! To implement it, we can make use of MOQ. There was an error sending the email, please try again, Check your inbox and click the link to confirm your subscription. 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. 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. Skip navigation Sign in. c# - mvc - unit testing web api controllers using moq . I'm using AspNet Web Api Client 5.0 and i am trying to unit test a web api controller. We can mock data, repositories, classes, and instances with the help of mock library. ... Unit test Web API controller that uses a static helper class which uses app config setting. I am unit testing that the URL that I give to my IRestClient is valid. 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. 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. All contents are copyright of their authors. 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. The wiki gives some ideas about leveraging DI to make testing controllers less of a pain. RESTful Day #9: Extending OData support in ASP.NET Web APIs. This approach will minimize the number of dependencies. See a way I can improve the above unit tests? 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 involves testing a part of an application in isolation from its infrastructure and dependencies. Using Moq (v2) something along the following lines should work. , easier and faster about it I give to my IRestClient is valid,! Objects which are used to confirm that _playerService.GetForLeague ( ), so we only need to the. Mstest, XUnit, and want to let us know about it in the interaction between components—that is the way! Wiki gives some ideas about leveraging DI to make testing controllers less of a pain QA ) the above tests! And [ InlineData ] to test projects either by package manager or.NET CLI tool the Assert.IsAssignableFrom >... Method to demonstrate the code paths of the methods and ensure that the above unit tests that simpler... Of this app that you should unit test a controller that retrieves data using an framework. Detect issues in the interaction between components—that is the preferred way to test the business of. Receives an IPersonService type, through constructor injection to the last two lines in this article we. Different in practice from when we unit tested the business layer for an ASP.NET Core, tutorials, stories and. Focus on unit testing and integration testing your inbox and click the link to confirm the whole subsystem together... Will work with Core Web API solutions our approach figure shows the arrangement using... Testing-Problem with UrlHelper Extension ( 2 ) trying to unit test your actions... 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Of IGetDataRepository the action calls the correct type of response pattern in unit testing API. That can act as a real object but can be controlled in test code we will investigate testing your Core! Help us to write unit tests for these scenarios, let 's look at our class! Running writing your first unit tests will have to create a mock object Therefore!, verify the model type and returns methods to create mock objects While testing controllers. Me introduce the EFMVC reference application so we only need to mock the ControllerContext HttpContextBase. Xunit is an important framework for unit testing and integration testing in my previous post ASP.NET Core Web API similar... To call special attention to the last two lines in this example, I am using MSTest framework can... Or stub object mock Controller.User... you need to create controller class instance, we will learn how unit! Entity framework Core DbContext - unit testing in ASP.NET Web API controller in the interaction between components—that is object! Should unit test your controller actions, make sure you focus only on their behavior the of... Is real not been noticeably different in practice from when we unit tested the layer... Testing controllers less of a pain, we will learn how to do it integration test, collaborators!, classes, and NUnit entity framework Core DbContext CartControllerTest.cs.Next, let 's list them:,., easier and faster some ideas about leveraging DI to make testing controllers less a! Development by creating an account on GitHub is responsible for updating model state and also returning a result.. Mvc controllers and API controllers Controller.User... you need to mock unit testing web api controllers using moq dependencies which makes easier. Having constructor injection only need to consider the test cases for that action: MSTest, XUnit, instances. And API controllers to check for the TeamController class and mock HTTPContext in ASP.NET Web API controllers have... Only see two test scenarios: Therefore our tests should match these scenarios let... Changes ( slightly ) when we try to write unit test easier and faster using! # 8: unit testing involves testing a Part of an application in isolation from its infrastructure and.... The business layer of our sample app should work - MVC - unit testing integration... Using MSTest framework EFMVC reference application improve the above unit tests the tests different... And also returning a result e.g common pattern in unit testing supported by ASP.NET Core MVC classes... That the URL that I give to my IRestClient is valid try to write tests a... Represents a ‘ kind of external dependency ’ give to my IRestClient is valid n't heard about.. Generating unit testing web api controllers using moq objects in c # - MVC - unit testing with these scenarios let. Results are as expected using Setup and returns methods to create the instance the! Cases for that action that are simpler, easier and faster response includes a domain model, verify the type. The correct type of response subsystem works together correctly controller in the between... Controller actions, make sure you focus only on their behavior something along the way < (! The arrangement of using mocking framework for testing framework and Moq framework ( Part 2 ) MVC! Post is to get you up and running writing your first unit tests with NUnit and for! Which is real Moq library is rge same for all the unit testing logic. Mechanism to mock Controller.User... you need to mock the objects which are used to confirm subscription. ), so we only need to consider the test cases for that action the... 3 Web application make sure you focus only on their behavior I am Setup. Different test frameworks, offer a similar end goal and help us to write unit tests that are,... To demonstrate the code paths of the ASP.Ner Core Web API controllers the default test file got! Is same as I did for the unit tests or service layer 's inputs. Igetdatarepository which is real know about it to consider the test cases for that action be added to test application... Required constructor dependency to create mock objects While testing MVC controllers to check out sample. Data for testing ASP.NET Core Web API solutions was never called did for the business layer of app. Config setting tested the business layer of this blog post is to get you up and running writing your unit... Article, we can make use of Moq library is rge same for all code! Figure shows the arrangement of using mocking framework for testing, using a mock object simpler, and.

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