NUnit VS Fluent Assertions

Compare NUnit vs Fluent Assertions and see what are their differences.

Fluent Assertions

A very extensive set of extension methods that allow you to more naturally specify the expected outcome of a TDD or BDD-style unit tests. Targets .NET Framework 4.7, as well as .NET Core 2.1, .NET Core 3.0, .NET 6, .NET Standard 2.0 and 2.1. Supports the unit test frameworks MSTest2, NUnit3, XUnit2, MSpec, and NSpec3. (by fluentassertions)
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NUnit Fluent Assertions
26 7
2,453 3,573
2.5% 0.9%
9.2 9.6
1 day ago 8 days ago
C# C#
MIT License Apache License 2.0
The number of mentions indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.

NUnit

Posts with mentions or reviews of NUnit. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2023-07-21.
  • CI/CD Pipeline Using GitHub Actions: Automate Software Delivery
    8 projects | dev.to | 21 Jul 2023
    .NET / xUnit / NUnit / MSTest
  • Fluent Assertions: Fluently Assert the Result of .NET Tests
    3 projects | dev.to | 11 Jul 2023
    This library extends the traditional assertions provided by frameworks like MSTest, NUnit, or XUnit by offering a more extensive set of extension methods. Fluent Assertions supports a wide range of types like collections, strings, and objects and even allows for more advanced assertions like throwing exceptions.
  • TDD vs BDD - A Detailed Guide
    6 projects | dev.to | 9 Jun 2023
    Next, you need to install a testing framework that will be used for performing unit testing in your project. Several testing frameworks are available depending on the programming language used to create an application. For example, JUnit is commonly used for Java apps, pytest for Python apps, NUnit for .NET apps, Jest for JavaScript apps, and so on. We’ll use the Jest framework for this tutorial since we are using JavaScript.
  • Setting up a simple testing project with C#
    7 projects | dev.to | 27 May 2023
    At this point you're going to see a familiar screen asking you to select a project. Here we're looking for a test project. By default, Visual Studio gives you access to 3 different testing frameworks based on your choice of project. These are MSTest, XUnit and NUnit. Ultimately, all 3 of these testing accomplish the same thing, and I've worked with all of them at various points in my career. The difference is mainly in exact syntax and documentation. Although, it's generally considered that MSTest is a little "older" than NUnit or XUnit, so I tend to see it less now. For the purposes of this demo, I'm going to go with NUnit:
  • Test-Driven Development
    3 projects | dev.to | 4 May 2023
    Use a testing framework: Utilize a testing framework like NUnit, xUnit, or MSTest to create, organize, and run your tests. These frameworks provide a consistent way to write tests, generate test reports, and integrate with continuous integration tools.
  • Debugging extension for test library
    2 projects | /r/csharp | 13 Apr 2023
    So I wrote extension attribute for Nunit, the opposite of how the retry attribute works.
  • 2023 Development Tool Map
    20 projects | dev.to | 19 Feb 2023
  • Unlock the Power of Unit Testing: A Beginner’s Guide to Quality Software Development
    3 projects | dev.to | 30 Jan 2023
    This is a basic example of how to create an NUnit unit test for a simple API in a controller with C#. You can find more information and resources on the NUnit website and in the NUnit documentation.
  • Commemorating Charlie Poole's Contributions to the NUnit Project
    1 project | /r/dotnet | 28 Jan 2023
    Has #NUnit helped you, your career, or your organization? We'd love for you to tell that story here, to celebrate Charlie: https://github.com/nunit/nunit/discussions/4283
    1 project | news.ycombinator.com | 28 Jan 2023
    After over TWENTY years leading the NUnit project, Charlie is stepping back.

    Has NUnit helped you, your career, or your organization? We'd love to hear about it at https://github.com/nunit/nunit/discussions/4283.

    > To attempt to quantify Charlie’s contributions to NUnit is a daunting task. He was the lead of NUnit across at least 207 releases in 37 different repositories, authoring 4,898 commits across them. He participated in 2,990 issues, 1,305 PRs, and impacted 6,992,983 lines of code. And those are only the ones we can easily find; our numbers are sourced from after NUnit moved the project to GitHub in 2011, which means there are at least 9 additional years of work not quantified above.

    I think of Charlie as one of the ".NET OSS OGs". I'd love to see him celebrated.

Fluent Assertions

Posts with mentions or reviews of Fluent Assertions. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2022-12-20.
  • Integration tests without API dependencies with ASP.NET Core and WireMock.Net
    5 projects | dev.to | 20 Dec 2022
  • [Parte 8] ASP.NET Core: Integration Tests
    4 projects | dev.to | 13 Apr 2022
    FluentAssertions para Asserts muy flexibles y entendibles
  • BREAKING!! NPM package ‘ua-parser-js’ with more than 7M weekly download is compromised
    32 projects | /r/programming | 22 Oct 2021
    https://www.nuget.org/packages/Newtonsoft.Json/ https://www.nuget.org/packages/AutoMapper/ https://www.nuget.org/packages/Dapper/ https://www.nuget.org/packages/FluentValidation/ https://www.nuget.org/packages/FluentAssertions/ https://www.nuget.org/packages/NUnit/ https://www.nuget.org/packages/xunit/ https://www.nuget.org/packages/YamlDotNet/ https://www.nuget.org/packages/Moq/ That is simply not true. Mature c# projects purposely maintain no downstream dependencies and is they do, it's to a major reputable lib. See for yourself - these are staple third party packages commonly used. Anything dependency starting with System or NETStandard is Microsoft maintained.
  • ASP.NET Core Unit Testing with FluentAssertions
    3 projects | dev.to | 21 Aug 2021
    FluentAssertions is one of the most popular (over 66 million downloads on Nuget) .NET library that contains a large collection of .NET extension methods that allow .NET developers to write unit tests using a fluent syntax which is very easy to read and write and clearly shows the intent of the unit test. The library has extension methods to test almost everything related to .NET such as Strings, Booleans, Dates, Guids, Collections, Exceptions, and even Nullable Types. You can add this library to your unit test projects via Nuget package manager and start using this library in few minutes.
  • My first NuGet package: Fluent Random Picker
    4 projects | /r/csharp | 27 Jun 2021
    I love fluency. I myself work on a package for fluent programming. I recommend you using FluentAssertions for tests though. Nonetheless, keep working! Starred your repo.
  • Honk#! Honk in convenient C# now!
    5 projects | /r/csharp | 23 Jun 2021
    For example, all tests below this line are written in Honk# + FluentAssertions (the latter is an example of a library which also provides a lot of fluent methods for xUnit to perform assertions). Soon I'll be moving more of its (AngouriMath's) code to this style, as long as it doesn't harm readability and performance.
  • Cell CMS - Criando testes de maneira prática
    6 projects | dev.to | 31 Jan 2021
    fluentassertions / fluentassertions

What are some alternatives?

When comparing NUnit and Fluent Assertions you can also consider the following projects:

NSubstitute - A friendly substitute for .NET mocking libraries.

Shouldly - Should testing for .NET—the way assertions should be!

xUnit - xUnit.net is a free, open source, community-focused unit testing tool for .NET.

NFluent - Smooth your .NET TDD experience with NFluent! NFluent is an ergonomic assertion library which aims to fluent your .NET TDD experience (based on simple Check.That() assertion statements). NFluent aims your tests to be fluent to write (with a super-duper-happy 'dot' auto-completion experience), fluent to read (i.e. as close as possible to plain English expression), but also fluent to troubleshoot, in a less-error-prone way comparing to the classical .NET test frameworks. NFluent is also directly inspired by the awesome Java FEST Fluent assertion/reflection library (http://fest.easytesting.org/)

Moq - Repo for managing Moq 4.x [Moved to: https://github.com/moq/moq]

SpecFlow - #1 .NET BDD Framework. SpecFlow automates your testing & works with your existing code. Find Bugs before they happen. Behavior Driven Development helps developers, testers, and business representatives to get a better understanding of their collaboration

coverlet - Cross platform code coverage for .NET [Moved to: https://github.com/coverlet-coverage/coverlet]

dotnet-testcontainers - 🐋 A library to support tests with throwaway instances of Docker containers for all compatible .NET Standard versions. [Moved to: https://github.com/testcontainers/testcontainers-dotnet]