SpecFlow vs Machine.Specifications

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 (by SpecFlowOSS)

Source Code

specflow.org

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Machine.Specifications

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

Testing mspec .NET unit-testing

Source Code

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SpecFlow		Machine.Specifications
	Project
2	Mentions	1
2,203	Stars	883
0.5%	Growth	-0.1%
0.0	Activity	4.0
20 days ago	Latest Commit	about 1 month ago
C#	Language	C#
GNU General Public License v3.0 or later	License	MIT License

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.

SpecFlow

Posts with mentions or reviews of SpecFlow. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2022-09-13.

I need a place to post programming questions
1 project | /r/findareddit | 31 Mar 2023

You can also try posting an issue to the SpecFlow GitHub repo. That sometimes gets me an answer. And when all else fails, I just bite the bullet and post to Stack Overflow.
Specflow on Docker
2 projects | /r/selenium | 13 Sep 2022

Or here... https://github.com/SpecFlowOSS/SpecFlow/blob/master/Dockerfile

Machine.Specifications

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.

Show HN: A C# library to help you enforce a Given-When-Then structured Unit test
2 projects | news.ycombinator.com | 29 Aug 2021

Looks like a similar concept to https://github.com/machine/machine.specifications which I used many years ago to try and achieve BDD style unit testing.
One point to note from your introduction was the following statement:

What are some alternatives?

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

BDDfy - BDDfy is the simplest BDD framework EVER!

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

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.

NUnit - NUnit Framework

xBehave.net - ✖ An xUnit.net extension for describing each step in a test with natural language.

Xunit.Gherkin.Quick - BDD in .NET Core - using Xunit and Gherkin (compatible with both .NET Core and .NET)

LightBDD - BDD framework allowing to create easy to read and maintain tests.

AutoFixture - AutoFixture is an open source library for .NET designed to minimize the 'Arrange' phase of your unit tests in order to maximize maintainability. Its primary goal is to allow developers to focus on what is being tested rather than how to setup the test scenario, by making it easier to create object graphs containing test data.

WireMock.Net - WireMock.Net is a flexible product for stubbing and mocking web HTTP responses using advanced request matching and response templating. Based on the functionality from http://WireMock.org, but extended with more functionality.