Unit Testing In Asp Net Core 3.1



25 Kasım 2020

Getting your code to be unit testable itself is a way for you to improve your design. We will try to build a simple class library that will calculate the nth term in the Fibonacci sequence. To do that, we will want .net unit testing to create a class for calculating Fibonacci sequences that depends on a custom math class that adds the numbers together. Then, we can use the .NET Testing Framework to ensure our program runs as expected.

xUnit is a free, open source Unit testing framework for .Net developed by Brad Wilson and Jim Newkirk, inventor of NUnit. The framework is built with .Net Framework 2.0 and it doesn’t require any installation , which makes it ideal for storing control. On top of that, it works .net unit testing well with ReSharper, Xamarin, TestDriven.Net and a Console runner for accomplishing the Unit test. It includes the excellent extensibility of test classes and test methods. xUnit test is the best Unit testing framework for .Net programming languages like C#, VB.Net, and F#.

How Can We Run A Test Inside Visual Studio?

In the relational database in production this would raise an exception, but it does not happen in the InMemory storage. This pushed me to investigate and see how to actually mock the DbContext and setup the behavior like throwing exception when an entity with specific ID already exists. So we have managed to test out the two major paths through our code but there are more tests, more assertions we could be doing. For example, we could ensure that the value of the Cart corresponds to what the customer is actually being charged.

.net unit testing

The quickest way to set up unit testing for an ASP .NET Core web app project is to create a new test project using a template. This creates a cross-platform .NET Core project that includes one blank test. In Visual Studio 2019, search for “.net core test project” when creating a new project to identify test projects for MSTest, XUnit and NUnit. Select theXUnitproject to follow along with the NetLearner samples. Step 2) Let’s now add a new class to the DemoApplication. This class will contain a string called ‘Guru99 – ASP.Net.’ This string will be tested in our testing project.

Unit Testing Using Microsoft Entityframeworkcore.inmemory

Before running coverage analysis or performance profiling, make sure that the PDB information exists for all target assemblies. The safest choice would be to build your code with the Debug build configuration. Note that test frameworks identify tests in different ways. For example, MSTest uses test-methods FQNs but NUnit uses properties of test attributes as test IDs.

Why is unit testing important?

Unit testing ensures that all code meets quality standards before it’s deployed. This ensures a reliable engineering environment where quality is paramount. Over the course of the product development life cycle, unit testing saves time and money, and helps developers write better code, more efficiently.

In this course, Writing Testable Code, you’ll learn how to write code that is easy to test. These skills are necessary to refactor code that is difficult to test into code that is easily testable. First, you’ll be introduced to testable code, and how creating seams in your code makes code testable. Next, you’ll learn a series of best practices that makes .net unit testing testing code easier such as, simplifying object construction, working with dependencies, and managing application state. Finally, you’ll explore best practices further by walking through a code demo of each practice so you can see first-hand how they’re implemented. These skills will make practices like unit testing significantly easier for you.

Testing Other Aspects

You have a parameter called “expectedName”, which you use in the assertion. However, you have hard-coded the name during your setup steps, so trying any other name will cause the test to fail. You will see the below code added by Visual Studio in the UnitTest1.cs file. This is the basic code needed for the test project to run.

.net unit testing

Then if you want to apply the appropriate name so apply name otherwise just click on the create button. Add a reference from the test project to the project that which you want to test. After Creating the Simple Hello word Program go to the solution explorer and right-click on it. Add New Project, at that time select the MSTest Project that is displayed using below screen. I’ll be using the class ‘WordUtils’ and the method ‘Reverse’ for the purpose of this article. The class has a constructor that will accept an instance of ‘ILogger’ for logging purposes.


We then create a new comment object which we will broadcast, then call the comment method passing in the new comment object. First, we declare a variable called context which is an instance of our FakedbContext class, passing in an object Multi Messenger Platform Development of two comments as our comments. Next, we pass the instance to the constructor of our HomeController. We then call the comments method passing in the id of the BlogPost we want to get comments for, casting the result as a JsonResult.

.net unit testing

The setup fixture above sets the testing logging factory once per assembly because the factory is statically cached during the lifetime of the application domain. Subsequent test executions then clear the logged statements before every test run as shown below. To determine the testable context for a behavior context, replace the I at the beginning of the interface name with Testable.

Unit testing is the art of writing code to verify if a unit of functionality in a software application is working the way it was intended to work. If the intention was to capitalize the first letter of a word, a unit test could verify that the first letter is capitalized and all the other letters remain untouched. Now you will see the Test Explorer on the left side in which you can see that all the tests are passed.


TDD has been a bit of a buzzword in recent years but adoption has been slow. Its conceptual nature is confusing for stakeholders which makes it difficult to get approved. But as a developer, I encourage you to write even a small application using the TDD approach to solutions architect roles and responsibilities get used to the process. The Microsoft Unit Testing Framework also comes with a number of tools to help you better analyze your testing procedures. Also, as it is owned and written by Microsoft, there is some feeling of stability in its existence going forward.

This rarely happens in practice, but if you do have tests with the same ID, they will appear as a single node in the Unit Tests window, and only one of them will run. We will need to pass an implementation of our Mock when we call the actual production code. There’s an Object property on the Mock that represents the concrete implementation. We first construct cardMock and then we pass cardMock.Object to the Charge() method. We want the Cart items to be shipped to a customer providing we got paid.

Goals Of Unit Testing

To handle dependency injection, both Ninject and Unity exist on the DotNet platform. There is very little difference between the two, and it becomes a matter of if you want to manage configurations with Fluent Syntax or XML Configuration. Testing that our Fibonacci Method handles negative numbers by throwing an exception.

  • Even better, using Moq we can simply define what Math.Add returns.
  • For this tutorial, a reference to System.Web.Mvc will be required, so we can have access to functions like ViewResult, ActionResult, etc.
  • Increased coupling between the test and the code, may result in the test breaking when the internal implementation has changed, while the exposed behavior hasn’t changed.
  • You can see that the Employees test method is also passed now.
  • You’re likely going to have to rely on mocking lots of services, which increases the complexity of tests, while generally reducing their efficacy.

Rather than inject the Math class into Fibonacci, we can inject the IMath interface into Fibonacci. The benefit here is that we could define our own OurMath class that we know to be accurate and test our calculator against that. Even better, using hire net developer Moq we can simply define what Math.Add returns. We can define a number of sums or we can just tell Math.Add to return x + y. Nickolas specializes in large scale enterprise web apps, payment gateways, software architecture, and Windows services.

Unit Testing In Asp Net Core 3.1

Just don’t try and force them everywhere for the sake of it. Except if you have resource-based, imperative, authorization checks in your controller. These are very common in multi-user environments—I artificial intelligence vs. machine learning shouldn’t be able to edit a post that you authored, for example. Resource-based authorization uses the IAuthorizationService interface which you need to inject into your controller.

What is .NET testing?

Introduction to testing for ASP.Net
This test is the functionality of an application. The testing is conducted to ensure that the application behaves as expected. In ASP.Net, the first task is to create a test project in Visual Studio. The test project will contain the necessary code to test the application.

Do not bother about that code, just add the below line of code. Nickolas is a developer with over a decade of experience in many languages and platforms. He specializes in large scale enterprise web apps, payment gateways, software architecture, and Windows services. A passionate company owner, Nickolas works with clients from around the globe and has led his team through many successful web, and mobile app development projects. The biggest upside for me in using NUnit is parameterized tests. In our above Fibonacci example, we can enter a number of test cases and ensure those results are true.

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Step 6) Now let’s add our test project to the Demo Application. Click the ‘Add’ button to add the file to the DemoApplication. Before we create a test project, we need to perform the below high-level steps. In the page, we have the message “Guru99 – ASP.Net” displayed. Now how can we confirm that the correct message is displayed when an ASP.Net project runs. This is done by adding a test project to the ASP.Net solution (used to develop web-based applications).