5 Essential Unit Testing Tools for C#: Beginner’s Guide | MethodPoet (2022)

Just like with any other piece of software, your .NET applications are prone to bugs.

Any company that builds .NET applications wants to have as few bugs as possible. After all, how else could you expect to retain users if your application is buggy?

However, the good news is that unit testing can help you catch these bugs before they become a problem. But to write unit tests, you need some tools that will help you. Different tools for different purposes.

This article will provide you with information on the most popular unit testing tools for C# development:

  • xUnit – unit testing framework
  • Moq – mocking framework
  • FluentAssertions – assertions framework
  • Autofixture – library for generating test data
  • OpenCover – code coverage tool

You will also find out why it’s essential to have some of these tools for test-driven development (TDD).

Table of Contents

(Video) Unit Testing C# Code - Tutorial for Beginners

What is unit testing?

Unit testingis a software development method that involves writing and executing tests to verify the functionality of individual units of source code. The ultimate goal of unit testing is to provide developers with a mechanism for verifying that each component works as intended and is not affected by bugs in other components.

As the code base grows, the complexity of managing its changes increases significantly. The complexity is especially true for large applications, where it’s hard to see how all parts fit together. Unit testing keeps your code in good condition and reduce the number of bugs.

Like any other process, the big part of the overall success is the tools you use.

#1 xUnit – unit testing framework

The first thing you need is a unit test framework. A unit testing framework is a specific kind of software development framework that allows developers to write test cases. The framework provides the infrastructure for recording and playing back tests and the libraries to help manage these tasks.

xUnitframework is a unit testing tool created byKent Beck. xUnit frameworks use a familiar interface to make sharing code between tests written in multiple languages. Together, they provide a powerful toolkit for managing and executing test cases. xUnit is a free, open-source, community-focused unit testing tool for the .NET Framework. This unit test framework is part of the.NET Foundationand supports all major .NET frameworks.

The other popular alternatives to xUnit are:

  • NUnit –NUnitis a .NET port of JUnit and has a very similar syntax to xUnit. It is one of the most popular unit testing frameworks for .NET and part of the .NET foundation. NUnit is a free and open source unit testing framework. It comes with hundreds of powerful assertions that allow you to express the outcome you expect from your code.
  • MSTest –Microsoft Test Framework (MSTest)is a lightweight, managed code test framework for Microsoft .NET Framework. MSTest provides an API for writing tests in C#, VB.NET, and other .NET languages. This framework aims to help developers build quality applications with minimum effort on the testing aspect of those applications. It does it by providing a unit testing environment as part of the development process. It usually comes installed with Visual Studio.

There are not too many differences between xUnit, NUnit, and MSTest. You can pick any of those three and still be able to write good unit tests. I prefer using xUnit because it’s very popular, has very good support for parameterized tests, and supports all other use cases I might have while writing unit tests.

(Video) Getting Started with Unit Testing in Visual Studio 2022 - nUnit

#2 Moq – mocking framework

Mocking frameworks are really useful tools to have in your testing arsenal. For example, when writing unit tests, it is common to have dependencies that need to be faked. These dependencies may be database connections, file systems, web services, or other objects that are not easily testable. Mocking frameworks allow you to easily createfake objectsthat can simulate responses for your tests.

Moqis a mocking framework for .NET thatallows you to write tests with ease. It has many features that allow you to fake any class and interface, verify calls, create stubs, and much more. It also provides some extension methods for fluently creating mock objects.

#3 FluentAssertions – assertions framework

FluentAssertionsis a .NET library that allows you to write better assertions in your unit tests. It provides a fluent API for writing assertions and makes it easier to create chains of assertions. It provides a fluent interface for building assertions, allowing you to create more readable assertions.

You might be wondering: why is it important to have good assertion statements?

If you have bad assertion statements, it’s harder to understand what the test checks. It’s not obvious what the expected behavior is. Also, with FluentAssertions, you get better error messages in the test explorer window inside Visual Studio.

FluentAssertions is available onNuGet, so you can easily install it.

#4 Autofixture – library for generating test data

AutoFixtureis an open-source .NET library that helps you write unit tests faster. You can use AutoFixture to easily set up data contexts and generate random data when writing unit tests.

It achieves this by letting users supply their test data generators as well as providing several included generators such as:

(Video) Unit Testing | .NET Core 101 [7 of 8]

  • completely autogenerated string
  • seeded string
  • autogenerated number
  • complex type

And much more.

If you want to learn more about AutoFixture, I recommend checking it out on GitHub for more information.

OpenCover is a free open-source code coverage analysis tool for .NET. You can run it on Windows, on both 32 and 64 bits.

Code coverage is an important aspect of testing. Unit tests are good at telling you that your code runs correctly under certain conditions, but they don’t tell you if the tests cover all execution paths. So you see, testing only the happy path is not enough.

Code coverage tools track how much of your code is executed when running unit tests. In addition, they point out parts of your code that are not covered by tests. These tools are very useful for determining whether your test suites are effective, especially when you work on legacy code that tests don’t cover.

Why are unit testing tools essential for TDD?

Automated testing is an essential part of test-driven development (TDD).

What is test driven development (TDD)? Well,TDDis a software development process that relies on the repetition of a concise development cycle:

  • The developer writes an (initially failing) automated test case that defines a desired improvement or new function,
  • It makes it pass by implementing the new function,
  • Refactors the code to make it production-ready,
  • And repeats this cycle.
5 Essential Unit Testing Tools for C#: Beginner’s Guide | MethodPoet (2)
(Video) Unit testing your Web APIs [18 of 18] | Web APIs for Beginners

Practicing TDD is one of the best things you can do for your code. It helps to make your code well-written, clean, and easy to debug. So if you want to create good software, it’s vital to practice TDD.

When you combine TDD with automated testing tools, you’ll find developing, testing, and deploying new features much easier.

You can use:

  • xUnit framework to write tests that guide your implementation
  • Moq to write fakes for interfaces that don’t exist yet
  • FluentAssertions to have better asserts
  • Autofixture to finish the testing step faster

As you can see, those tools work together in harmony to increase your productivity.

Conclusion

The unit testing tools we examined today are all great at what they do.

There may be a few that suit your specific needs better than others, but I encourage you to try them all to decide which works best for you.

With many options available to C# developers, choosing the right testing tool can be a challenge. This article highlights five software testing tools that will help you test your software more effectively. In addition to these five, there are also other popular C# unit testing tools.

If you would like to learn more about unit testing, please read thepost about unit testing.

(Video) Intro to Unit Testing in C# using XUnit

FAQs

What are the tools available for unit test C#? ›

What is the best unit test framework for C #? ›

  • MSTest. MSTest comes with Visual Studio Code IDE which makes it very easy to get started. ...
  • NUnit. NUnit originally started out as a port from Java's JUnit so it has a rich history of unit testing along with C# functionality. ...
  • xUnit.Net. xUnit.Net is an open source testing framework that is based on the . ...
  • Implementation.
16 Sept 2022

What is unit testing in C #? ›

Unit testing is a method of testing software where individual software components are isolated and tested for correctness. Ideally, these unit tests are able to cover most if not all of the code paths, argument bounds, and failure cases of the software under test.

Does C have unit testing? ›

A Unit Testing Framework for C

CUnit is a lightweight system for writing, administering, and running unit tests in C. It provides C programmers a basic testing functionality with a flexible variety of user interfaces.

Is Jenkins a unit testing tool? ›

Jenkins provides an out of box functionality for Junit, and provides a host of plugins for unit testing for other technologies, an example being MSTest for . Net Unit tests. If you go to the link https://wiki.jenkins-ci.org/display/JENKINS/xUnit+Plugin it will give the list of Unit Testing plugins available.

Why are testing tools needed for unit testing? ›

Unit testing tools are used by the developers to test the source code of the application or to achieve the source code of the application.

Which unit testing is best? ›

#1) NUnit
  • NUnit is a unit testing framework based on.NET platform.
  • It is a free tool allows to write test scripts manually but not automatically.
  • NUnit works in the same way as JUnit works for Java.
  • Supports data-driven tests that can run in parallel.
  • Uses Console Runner to load and execute tests.
25 Oct 2022

Can you name any code testing tools? ›

TestComplete is a functional testing platform that offers various solutions to automate testing for desktop, web, and mobile applications by SmartBear Software. TestComplete offers the following features: GUI testing. Scripting Language Support – JavaScript, Python, VBScript, JScript, DelphiScript, C++Script & C#Script.

What is testing in C? ›

It is the process using which we find errors and bugs. It is the process using which we correct the bugs that we found during the testing process. Code Failure. We can identify the failure of any implemented code using this process. We use this process to provide the code failure with an absolution.

What is unit testing example? ›

What is Unit Testing? Unit testing is testing the smallest testable unit of an application. It is done during the coding phase by the developers. To perform unit testing, a developer writes a piece of code (unit tests) to verify the code to be tested (unit) is correct.

What are the types of testing? ›

The different types of tests
  • Unit tests. Unit tests are very low level and close to the source of an application. ...
  • Integration tests. ...
  • Functional tests. ...
  • End-to-end tests. ...
  • Acceptance testing. ...
  • Performance testing. ...
  • Smoke testing.

How do I write my test code? ›

  1. Test Small Pieces of Code in Isolation. ...
  2. Follow Arrange, Act, Assert. ...
  3. Keep Tests Short. ...
  4. Make Them Simple. ...
  5. Cover Happy Path First. ...
  6. Test Edge Cases. ...
  7. Write Tests Before Fixing Bugs. ...
  8. Make Them Performant.
28 May 2021

What are unit test frameworks? ›

What are unit test frameworks and how are they used? Simply stated, they are software tools to support writing and running unit tests, including a foundation on which to build tests and the functionality to execute the tests and report their results.

Does C++ have unit testing? ›

You can write and run your C++ unit tests by using the Test Explorer window. It works just like it does for other languages. For more information about using Test Explorer, see Run unit tests with Test Explorer.

How do I use Google to test C++? ›

  1. Create a new static library project with a name GoogleTest. Add->New Project->Win32 Project->Static Library without precompiled header.
  2. Right click on our new project, GoogleTest. On the Properties Pages, add include path: ...
  3. Add source files by Add->Existing Item... ...
  4. Build GoogleTest into static library.

Why do testers use Jenkins? ›

Jenkins is a popular CI orchestration tool. It provides numerous plugins for integration with multiple test automation tools and frameworks into the test pipeline. When it comes to Test Automation, Jenkins provides plugins that help run test suites, gather dashboard results, and provide details on failures.

What are the 5 features that Jenkins can automate? ›

Jenkins is an open-source CI/CD server that helps automate software development and DevOps processes.
...
Key Features of Jenkins
  • A variety of plugins. ...
  • Simple installation and configuration. ...
  • Open-source availability. ...
  • A significant degree of extensibility. ...
  • Server-based security.
20 Jul 2022

Why we use Jenkins in selenium? ›

Jenkins is a continuous integration tool that enables continuous testing, build, and deployment of iterative code changes. CI/CD tools help catch failures ahead of the production stage and mitigate them as they occur.

How can I improve my unit testing skills? ›

Five Tips to Improve Your Unit Testing
  1. Be Pragmatic About a "Unit" "A unit is a class" or even "a unit is a single method" are two dogmata people use to explain unit testing. ...
  2. Test Where the Logic is. I'm not a fan of CodeCoverage. ...
  3. Continuously Refactor Test Code. ...
  4. Build Your Own Set of Utilities. ...
  5. Always Write Tests for Bugs.
13 Jun 2017

Which tool is best for performance testing? ›

Apache JMeter

Apache JMeter helps you measure and analyze software performance. It's an open source tool based on Java that people use mainly for testing web app performance, but it also finds usage on other services. It can test performance for both dynamic and static resources, as well as dynamic web apps.

What is the best automation tool? ›

Know About The Best Automation Testing Tools for 2022
  • Katalon Studio.
  • Cucumber.
  • HPE Unified Functional Testing (UFT)
  • SoapUI.
  • TestComplete.
  • Worksoft.
  • IBM Rational Functional Tester (RFT)
  • Telerik Test Studio.

How do you practice unit testing? ›

Unit Testing Best Practices
  1. Write Readable, Simple Tests. Unit testing helps ensure your code works as intended. ...
  2. Write Deterministic Tests. ...
  3. Test One Scenario Per Test. ...
  4. Unit Tests Should Be Automated. ...
  5. Write Isolated Tests. ...
  6. Avoid Test Interdependence. ...
  7. Avoid Active API Calls. ...
  8. Combine Unit and Integration Testing.
20 Jun 2022

What three parts make a good test? ›

Naming your tests

The name of your test should consist of three parts: The name of the method being tested. The scenario under which it's being tested. The expected behavior when the scenario is invoked.

Who should write unit tests? ›

Yes, developers typically write unit tests. However, they are largely responsible for writing these tests to ensure that the code works – most developer tests are likely to cover happy-path and obvious negative cases.

Which testing tool is in demand 2022? ›

LambdaTest is by far one of the best automation testing tools for 2022 because of its ability to run automated Selenium scripts on a scalable cloud grid. This cross-platform web and application automated testing tool also allows testers to perform interactive live testing on 2,000+ real web browser environments.

Which testing tool is in demand? ›

Selenium

Selenium is a much-in-demand tool that offers an array of different capabilities for test automation. The Selenium IDE offers an Integrated Development Environment for running simple and reliable end-to-end tests.

How many testing tools are there? ›

2. How many software testing tools are available?
  • Automated Testing Tools.
  • Load Testing Tools.
  • Test Management Tools.
  • Defect Tracking Tools.
  • Security Testing Tools.
  • API Testing Tools.
  • Cross-browser Testing Tools.
  • Mobile Testing Tools.
2 Sept 2022

Which testing is performed first? ›

System testing is the first level in which the complete application is tested as a whole. The goal at this level is to evaluate whether the system has complied with all of the outlined requirements and to see that it meets Quality Standards.

What is debugging in C? ›

Debugging is a methodical process of finding and reducing the number of bugs (or defects) in a computer program, thus making it behave as originally expected. There are two main types of errors that need debugging: ▶ Compile-time: These occur due to misuse of language constructs, such as syntax errors.

What is testing and debugging in C? ›

Testing is the process to find bugs and errors. Debugging is the process to correct the bugs found during testing. It is the process to identify the failure of implemented code. It is the process to give the absolution to code failure.

Does QA do unit testing? ›

As the role of QA has evolved in the last few years, they not only perform functional and integration testing but also actively participating in unit testing.

Who will perform unit testing? ›

Who performs Unit Testing? Unit testing is the first software testing phase in SDLC and it is usually taken up during the development of the application. These unit test cases are written and executed by software developers.

What type of testing is unit testing? ›

A unit test is a way of testing a unit - the smallest piece of code that can be logically isolated in a system. In most programming languages, that is a function, a subroutine, a method or property. The isolated part of the definition is important.

What is a type 3 test? ›

Type III tests examine the significance of each partial effect, that is, the significance of an effect with all the other effects in the model. They are computed by constructing a type III hypothesis matrix L and then computing statistics associated with the hypothesis L. = 0.

What are testing techniques? ›

Software testing techniques are the ways employed to test the application under test against the functional or non-functional requirements gathered from business. Each testing technique helps to find a specific type of defect.

What are functional testing types? ›

Functional testing types
  • Unit testing.
  • Component testing.
  • Smoke testing.
  • Sanity testing.
  • Regression testing.
  • Integration testing.
  • API testing.
  • UI testing.
25 May 2021

How do you create a unit test? ›

To get started, select a method, a type, or a namespace in the code editor in the project you want to test, right-click, and then choose Create Unit Tests. The Create Unit Tests dialog opens where you can configure how you want the tests to be created.

How do you automate a unit test? ›

How to Automate Unit Testing and API Testing
  1. A good test strategy that defines the types and amount of testing.
  2. A test plan that indicates the tasks to be done to implement the test strategy.
  3. Test cases with detailed usage examples that will be used to check that the software meets the requirements.
6 May 2022

How many items do you need for unit testing? ›

A typical unit test contains 3 phases: First, it initializes a small piece of an application it wants to test (also known as the system under test, or SUT), then it applies some stimulus to the system under test (usually by calling a method on it), and finally, it observes the resulting behavior.

Which tools are used by both testers and developers? ›

The Best Automation Testing Tools For Developers
  • Selenium. Selenium is, arguably, the most popular automated testing framework. ...
  • Perfecto.io. Perfecto is both a web and mobile app testing framework. ...
  • Serenity. ...
  • Cypress. ...
  • Lambda Test. ...
  • TestProject.io. ...
  • Katalon Studio. ...
  • OpenTest.
5 Oct 2020

What is unit testing in Devops? ›

In computer programming, unit testing is a method by which individual units of source code are tested to determine if they are fit for use. A unit is the smallest testable part of an application. In procedural programming a unit may be an individual function or procedure.

What are unit testing tools for C++? ›

These C++ unit testing frameworks and other tools are among the most popular with developers.
  • Google Test. Google developed Google Test for its own internal use, and it has quickly become one of the most popular C++ unit testing frameworks. ...
  • Boost Test Library. ...
  • QA Systems Cantata. ...
  • Parasoft C/C++test.
2 Sept 2016

How do I create a unit test in CPP? ›

Setting Up Unit Testing

Right-click your solution and choose Add > New > Project. Click the Visual C++ category, and choose the Test sub-category. Select Native Unit Test Project, give the project a descriptive name, and then click OK.

How can I test Google? ›

Make a new quiz & answer key
  1. Open a form in Google Forms.
  2. At the top of the form, click Settings.
  3. Turn on Make this a quiz. Optional: To collect email addresses, next to “Responses,” click the Down arrow. and turn on Collect email addresses.

Is Google Test a framework? ›

What is Googletest? It is a test framework i.e., a software tool for writing and running unit tests. It is a library for writing C++ tests. It is based on xUnit architecture which is a set of “Frameworks” for programming and automated execution of test cases.

What is Assert_eq in C? ›

ASSERT_EQ( val1 , val2 ) Verifies that val1 == val2 . Does pointer equality on pointers. If used on two C strings, it tests if they are in the same memory location, not if they have the same value. Use EXPECT_STREQ to compare C strings (e.g. const char* ) by value.

Is Google an open source test? ›

Google test, or gtest is an open source framework for unit testing C\C++ projects.

What is unit test tools? ›

Unit Testing tools are the testing tools such as JUnit, TestNG, NUnit, PHPUnit, etc., which are used to perform unit testing on a specific module of code developed by the application developer.

Which is better xUnit or NUnit? ›

NUnit creates a new instance of the test class and then runs all of the test methods from the same instance. Whereas, xUnit.net creates a new instance of the test class for each of the test methods.

What are the types of unit testing? ›

There are 2 types of Unit Testing: Manual, and Automated.

Which tool is best for performance testing? ›

Apache JMeter

Apache JMeter helps you measure and analyze software performance. It's an open source tool based on Java that people use mainly for testing web app performance, but it also finds usage on other services. It can test performance for both dynamic and static resources, as well as dynamic web apps.

How do I start unit testing? ›

To add a unit test project:
  1. Open the solution that contains the code you want to test.
  2. Right-click on the solution in Solution Explorer and choose Add > New Project.
  3. Select a unit test project template. ...
  4. Add a reference from the test project to the project that contains the code you want to test.
1 Sept 2022

Can you name any code testing tools? ›

TestComplete is a functional testing platform that offers various solutions to automate testing for desktop, web, and mobile applications by SmartBear Software. TestComplete offers the following features: GUI testing. Scripting Language Support – JavaScript, Python, VBScript, JScript, DelphiScript, C++Script & C#Script.

What is unit testing example? ›

What is Unit Testing? Unit testing is testing the smallest testable unit of an application. It is done during the coding phase by the developers. To perform unit testing, a developer writes a piece of code (unit tests) to verify the code to be tested (unit) is correct.

Does Microsoft use xUnit? ›

Microsoft is using xUnit internally, one of its creators is from Microsoft. xUnit was also created by one of the original authors of NUnit. There are no [Setup] and [Teardown] attributes, this is done using the test class' constructor and an IDisposable. This encourages developers to write cleaner tests.

Why should I use NUnit? ›

Using NUnit framework, tests can be executed serially as well as parallel. Parallel test execution is possible at assembly, class, or method level.

What is JUnit and NUnit? ›

JUnit is a very popular Unit testing framework for Java and NUnit, which is ported from JUnit and has become a popular Unit testing framework in the . Net world.

What is manual unit testing? ›

Manual unit testing is unit testing that is performed by people. Automated unit testing is unit testing executed without human intervention. You would use manual over automated unit testing when true user input is needed, when automation is too costly, or when unit testing is executed a small number of times.

Who will perform unit testing? ›

Who performs Unit Testing? Unit testing is the first software testing phase in SDLC and it is usually taken up during the development of the application. These unit test cases are written and executed by software developers.

What are the 9 types of performance testing? ›

Types of Testing
  • Load Testing. Load testing is sort of the simplest form of performance testing. ...
  • Stress Testing. ...
  • Scalability Testing. ...
  • Spike Testing. ...
  • Soak Testing. ...
  • Configuration Testing. ...
  • Availability & Resilience Testing.
26 Apr 2021

What tool is used for manual testing? ›

Here is the list of top 10 manual testing tools along with its features:
  • LoadRunner. It's one of the most widely used performance testing tools. ...
  • Citrus. Citrus is a tool for integrating testing, and it is the most often used test framework. ...
  • ZAP. ...
  • NUnit. ...
  • JIRA. ...
  • SonarQube. ...
  • JMeter. ...
  • Bugzilla.
25 Aug 2022

How many tools are used in performance testing? ›

Top 10 Performance Testing Tools | Load Testing Tools Guide | Edureka.

Videos

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2. Learn Unit Testing in C# with NUnit - Tutorial for Beginners
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3. Writing tests in .NET using xUnit - xUnit Tutorial
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4. Automation testing with Selenium C# .NET Core (Getting started series)
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5. Test Driven Development ASP.NET Core - C# and xUnit
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6. Getting started with Mocking using Moq in .NET (Core, Framework, Standard)
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