BddDotNet

BddDotNet is a behavior-driven development framework for .NET teams that want to write tests in Gherkin or build scenarios in C#. Its strongest case is the combination of those authoring styles with local execution and source generation; its .NET 10+ runtime requirement rules it out for older projects.

Overview

Scenarios can live in Gherkin feature files or be composed in C# with a builder pattern. That gives teams a choice between readable specifications and code-authored scenarios, without leaving the .NET project. A Gherkin source generator compiles feature files and registers their steps.

BddDotNet uses Microsoft.Testing.Platform as its testing backend and is based on Microsoft.Extensions.*. Setup adds the framework and its generator as NuGet packages to a .NET project. The guide demonstrates a console application in Visual Studio or through the .NET CLI, and a GitHub wiki covers setup and features. Execution is local.

Key features

• Gherkin and C# authoring: The two scenario styles give teams room to match the format to the contributors and test. C# expressions are also supported in Gherkin step arguments, which can connect scenario steps to code-level values.
• Table transformations: Gherkin table arguments can be transformed into C# models, a practical bridge for scenarios that need structured inputs.
• Extension points: Public interfaces and dependency injection support extending the framework. Additional features come in separate NuGet packages, giving teams a modular route to add capabilities.
• AOT and trimming: The project describes itself as friendly to Native AOT deployment and trimming, relevant to teams targeting those deployment approaches.
• Runtime and backend: Support for .NET 10+ is a firm constraint, and Microsoft.Testing.Platform is the chosen backend. Teams on older runtimes or committed to another backend should consider a different framework.

Pricing

BddDotNet is free and open source under the MIT License. Its Open source plan costs nothing. The license permits use, modification, distribution, and sublicensing subject to its terms, and provides the software without warranty. There is no free trial because the software is free; the project describes no paid tiers or plan caps.

Platforms

BddDotNet supports Linux, macOS, and Windows. It is installed into a .NET project through NuGet packages, and its documented runtime support begins at .NET 10. The console application setup examples provide a concrete starting point for .NET developers on the supported operating systems.

Who it's for

This is a good fit for .NET teams that want behavior-driven scenarios in Gherkin but also value a C# builder, or that need scenario tables mapped into C# models. Its interfaces, dependency injection, and separate feature packages will matter most to teams expecting to extend the framework. It is a poor fit for projects that must stay on .NET versions before 10 or need a different testing backend.

Pros and cons

• Pro: Gherkin files and C# scenario building offer two distinct ways to author tests within a .NET workflow.
• Pro: Source generation compiles feature files and registers steps, while table transformations and C# expressions connect Gherkin to C#.
• Pro: Public interfaces, dependency injection, and separate NuGet packages give teams extension and modularity options.
• Con: .NET 10+ runtime support excludes teams maintaining older .NET applications.
• Con: Microsoft.Testing.Platform is the backend, limiting its appeal to teams seeking a framework built around another test platform.
• Con: The MIT license provides the software without warranty, so users take on that risk when adopting it.

Alternatives

Browse BDD Testing Tools for a broader set of behavior-driven testing options. FitNesse is a free open-source alternative for readers who want a tool spanning Linux, macOS, Windows, web, API, and self-hosted platforms. Serenity BDD is another free open-source library, with a wider listed platform range; its JUnit 4 support is deprecated and planned for removal in Serenity 6.0.0.

Concordion is a free Java library under Apache License 2.0, making it the relevant alternative for Java projects. Cucumber Open is a free open-source option for readers looking at Android, API, Linux, macOS, or Windows support. Ginkgo is a free Go testing framework whose current supported major version is v2.

CukeTest offers a free Lite plan with visual feature editing and JavaScript and Python support; its built-in automation libraries have some usage limits, including 500 automation API calls and a three-minute limit. Karate has a free MIT-licensed framework plan for REST, GraphQL, and SOAP API testing, plus browser and desktop UI automation and Gatling performance testing. LightBDD is another free, open-source option under the BSD 2-Clause license.

Verdict

Choose BddDotNet if your team is building on .NET 10 or later and wants Gherkin and C# scenario authoring, with source generation and extension points in a free local framework. The .NET 10+ floor is the main reason to look elsewhere, especially for an existing application that must remain on an earlier runtime.