Machine.Specifications VS Shouldly

Compare Machine.Specifications vs Shouldly and see what are their differences.


Machine.Specifications is a Context/Specification framework for .NET that removes language noise and simplifies tests. (by machine)


Should testing for .NET—the way assertions should be! (by shouldly)
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Machine.Specifications Shouldly
1 4
864 1,868
0.6% 0.9%
3.1 3.8
13 days ago 5 days ago
C# C#
MIT License GNU General Public License v3.0 or later
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.


Posts with mentions or reviews of Machine.Specifications. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2021-08-29.


Posts with mentions or reviews of Shouldly. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2023-03-01.
  • NUnit vs XUnit for .net6+ microservices
    7 projects | /r/dotnet | 1 Mar 2023
    On a side note, something I would highly recommend NOT doing is using the built in assertion types for any of the test adapters. Without a doubt the hardest part of switching unit test frameworks is having to fix all your assertions which is why we use 3rd party assertions. The built-in assertions also tend to not be very feature rich and don't have the most helpful messages. We personally use FluentAssertions, but there are other options such as Shoudly or Should. I highly recommend picking one of them over the built in assertions. You will thank yourself later :)
  • I need a C# crash course for experienced developers
    6 projects | /r/learncsharp | 21 Oct 2022
    Shouldly - More "fluent" way of writing assertions that I tend to like more personally. Example:
  • What's your go-to unit testing tool?
    2 projects | /r/csharp | 8 Jul 2022
    I use NUnit and Shoudly.

What are some alternatives?

When comparing Machine.Specifications and Shouldly you can also consider the following projects:

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.

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

should - Should Assertion Library

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

NUnit - NUnit 3 Framework

Moq - Repo for managing Moq 4.x

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 (

Verify - Verify is a snapshot tool that simplifies the assertion of complex data models and documents.

Compare-Net-Objects - What you have been waiting for :+1: Perform a deep compare of any two .NET objects using reflection. Shows the differences between the two objects.

NSubstitute - A friendly substitute for .NET mocking libraries.